| Thomas Avenue over Sugarland Run | Poor | 60.0 ft | 1,687 | 1970 |
| New Road over Bull Run | Poor | 25.9 ft | 621 | 1993 |
| Davis Court over Tuscarora Creek | Poor | 51.8 ft | 195 | 1971 |
| Sully Road over Tributary Horsepen Run | Fair | 21.0 ft | 184,788 | 1963 |
| Sully Rd. over Cabin Branch | Fair | 38.1 ft | 127,227 | 1963 |
| Rte. 28 NB over Dulles Access RD | Fair | 389.1 ft | 93,735 | 1963 |
| Sully Road Rte.28 over Merrybrook Run | Fair | 26.9 ft | 84,996 | 1961 |
| Harry Byrd Highway over Broad Run | Fair | 217.8 ft | 71,111 | 1949 |
| Harry Byrd Highway over Broad Run | Fair | 217.8 ft | 71,111 | 1969 |
| Dulles Greenway over Trib. Horsepen Run | Fair | 42.0 ft | 70,185 | 1994 |
| Leesburg Pike over Goose Creek | Fair | 298.9 ft | 60,579 | 1991 |
| Leesburg Pike over Goose Creek | Fair | 295.9 ft | 60,579 | 1971 |
| 7 Bypass & Ramps over Tuscarora Creek | Fair | 47.9 ft | 60,248 | 1972 |
| Route 7 Bypass WB over Ivandale Road | Fair | 107.0 ft | 58,424 | 1980 |
| Route 7 Bypass over Berlin Turnpike Rte. 287 | Fair | 207.0 ft | 58,424 | 1987 |
| Rte. 7 Bypass Wbl over Hamilton Station Road | Fair | 111.9 ft | 57,955 | 1980 |
| D. Greenway Ramp I over Sully Road Sbl (rte. 28) | Fair | 358.9 ft | 47,273 | 1995 |
| Ramp H-nb Sully RD over Rte. 28 Sbl & Rte. 625 | Fair | 984.9 ft | 44,269 | 2005 |
| Route 7 Ramp A over Rtes 7&15 Ramps C;d;e&g | Fair | 1542.0 ft | 39,918 | 1997 |
| Route 7 Bypass Wbl over RTE 7 Business | Fair | 232.0 ft | 38,567 | 1990 |
| Route 7 Bypass over South Fork Catoctin Ck. | Fair | 210.0 ft | 38,567 | 1987 |
| Route 7 Bypass over South Fork Catoctin Ck. | Fair | 180.1 ft | 38,567 | 1987 |
| Dulles Greenway over Indian Creek | Fair | 43.0 ft | 36,985 | 1995 |
| Ramp A Of Route 28 over Broad Run | Fair | 315.9 ft | 36,769 | 1991 |
| Ramp A Over Rte. 7 over Route 7 | Fair | 268.0 ft | 36,769 | 1990 |
| Ramp A Of Rte. 28 over Ramp D Of Route 7 | Fair | 121.1 ft | 36,769 | 1991 |
| Old Ox Rd. 606 over Sully Rd. Rte.28 | Fair | 224.1 ft | 35,147 | 2004 |
| Dulles Greenway over Trib. Broad Run | Fair | 24.0 ft | 34,401 | 1995 |
| Harry Byrd HWY WB over Airmont Rd. 719 | Fair | 97.1 ft | 34,399 | 1990 |
| Rte.7 By Pass over Sleeter Lake | Fair | 22.0 ft | 34,399 | 1990 |
| Old Ox Road over Dulles Greenway-rte.267 | Fair | 377.0 ft | 32,235 | 1995 |
| Old Ox Road over Indian Creek | Fair | 43.0 ft | 32,235 | 1994 |
| Dulles Greenway EB over Sully Road (route 28) | Fair | 405.8 ft | 31,312 | 1995 |
| Ramp H Of D.grnway over Dulles Greenway & Ramp G | Fair | 429.1 ft | 31,312 | 1995 |
| Dulles Greenway EB over Ebl 267 Cd; Ramp B; Daar | Fair | 693.9 ft | 31,312 | 1995 |
| Dulles Greenway over Trib. Beaverdam Run | Fair | 28.9 ft | 30,365 | 1995 |
| Harry Byrd Hwy. EB over RTE 15 - King Street | Fair | 224.1 ft | 30,124 | 1976 |
| Harry Byrd Hwy. WB over RTE 15 King Street | Fair | 226.0 ft | 30,124 | 1976 |
| Route 607 over Trib Of Broad Run | Fair | 26.9 ft | 29,584 | 1998 |
| S. King Street over Tuscarora Creek | Fair | 49.9 ft | 28,126 | 1952 |
| Route 7_bypass over Simpsons Creek | Fair | 23.0 ft | 27,955 | 1990 |
| Farmwell Road over Trib Of Beaverdam Run | Fair | 42.0 ft | 27,924 | 1989 |
| Dulles Greenway over Trib. Beaverdam Run | Fair | 32.2 ft | 26,819 | 1995 |
| Dulles Greenway over Trib. Of Sycolin Creek | Fair | 44.0 ft | 26,706 | 1995 |
| Rte.7 Bypass Ebl over Tuscarora Ck.&hike-bike | Fair | 146.0 ft | 26,102 | 1972 |
| Atlantic BLVD over Trib. Of Broad Run | Fair | 22.0 ft | 25,627 | 1998 |
| Sterling Boulevard over Indian Creek | Fair | 24.9 ft | 25,254 | 1961 |
| Sterling Blvd. over Indian Creek | Fair | 40.0 ft | 25,254 | 2006 |
| Jefferson Pike over Piney Run | Fair | 21.0 ft | 25,063 | 1932 |
| US 340 over Potomac River & Csx Rwy | Fair | 2251.0 ft | 25,063 | 1946 |
| Charlestown Pike over Rte. 7 Bypass | Fair | 204.1 ft | 24,835 | 1980 |
| Dtre-ramps A&d over Rte. 7/15 Bypass | Fair | 222.1 ft | 24,713 | 1995 |
| Cascades Parkway over Harry Byrd Hwy; Route 7 | Fair | 213.9 ft | 23,336 | 1990 |
| Ramp "q" over Horsepen Run | Fair | 265.1 ft | 22,000 | 2007 |
| Ramp "s" over Horsepen Run | Fair | 143.4 ft | 22,000 | 2007 |
| James Monroe HWY over Potomac Rvr; Csx; C&o | Fair | 1700.1 ft | 20,831 | 1939 |
| John S. Mosby HWY over Lenah Run | Fair | 22.6 ft | 19,730 | 1935 |
| Dulles Greenway EB over Broad Run | Fair | 423.9 ft | 19,633 | 1995 |
| James Madison Hiwy over Clarks Run | Fair | 22.0 ft | 19,599 | 1987 |
| Dulles Greenway WB over Broad Run | Fair | 423.9 ft | 18,794 | 1995 |
| Ashburn Vill. BLVD over Beaverdam Run | Fair | 64.0 ft | 17,703 | 1991 |
| Claiborne PKWY over Trib. Of Beaverdam Run | Fair | 28.9 ft | 17,677 | 1992 |
| Claiborne Pkwy. over Trib. Of Beaverdam Run | Fair | 24.0 ft | 17,677 | 1992 |
| Charlestown Pike over N. F. Of Catoctin Creek | Fair | 86.0 ft | 17,429 | 1993 |
| Algonkian Parkway over Tributary Sugarland_run | Fair | 22.0 ft | 16,940 | 1992 |
| Evergreen Mills RD over Broad Run | Fair | 44.0 ft | 16,665 | 1971 |
| Battlefield Pkwy. over Dulles Greenway | Fair | 246.1 ft | 16,616 | 2007 |
| Charlestown Pike over South Fork Catoctin Ck. | Fair | 99.1 ft | 16,525 | 1937 |
| Market St.e.(7ebl) over Route 15 Bypass | Fair | 192.9 ft | 15,732 | 1972 |
| Market St.e.(7wbl) over Route 15 Bypass | Fair | 187.0 ft | 15,732 | 1972 |
| Dulles Greenway EB over Claiborne Parkway | Fair | 210.0 ft | 15,406 | 1995 |
| Dulles Greenway EB over Broadlands Blvd. | Fair | 159.1 ft | 15,406 | 1995 |
| Loudoun Co. Pkwy. over Dulles Greenway | Fair | 224.1 ft | 15,113 | 1995 |
| Dulles Greenway WB over Claiborne Parkway | Fair | 210.0 ft | 14,959 | 1995 |
| Dulles Greenway WB over Broadlands Blvd. | Fair | 159.1 ft | 14,959 | 1995 |
| Cascades Parkway over Lake Overflow | Fair | 21.0 ft | 14,450 | 1991 |
| James Monroe HWY over Sycolin Creek | Fair | 24.0 ft | 14,218 | 1969 |
| WB Dulles Greenway over Sycolin Creek | Fair | 319.9 ft | 14,193 | 1995 |
| WB Dulles Greenway over Goose Creek | Fair | 663.1 ft | 14,193 | 1995 |
| Palisade PKWY over Lake Overflow | Fair | 32.2 ft | 14,152 | 1991 |
| Riverside Pkwy. over Goose Creek | Fair | 451.1 ft | 14,071 | 2002 |
| EB Dulles Greenway over Sycolin Creek | Fair | 319.9 ft | 13,639 | 1995 |
| Dulles Greenway EB over Goose Creek | Fair | 663.1 ft | 13,639 | 1995 |
| Rte.7 Conn. Ramp over RTE 7 Harry Byrd Hwy. | Fair | 259.8 ft | 13,591 | 1976 |
| WB Dulles Greenway over Trib. Of Sycolin Creek | Fair | 154.9 ft | 13,553 | 1994 |
| Gum Springs Road over Bull Run | Fair | 115.2 ft | 13,468 | 1968 |
| WB Diaah over Horsepen Run | Fair | 135.2 ft | 13,000 | 1960 |
| EB Diaah over Horsepen Run | Fair | 135.2 ft | 13,000 | 1960 |
| Saarinen Circle over Commercial Vehicle Drive | Fair | 131.9 ft | 13,000 | 1993 |
| WB Diaah Entrance over Horsepen Run | Fair | 162.7 ft | 13,000 | 1997 |
| Pacific Boulevard over Tributary Of Broad Run | Fair | 25.9 ft | 12,561 | 1993 |
| Algonkian Parkway over Trib. Potomac River | Fair | 45.9 ft | 12,096 | 1992 |
| Charlestown Pike over Trib.of N.fork Catoctin | Fair | 23.0 ft | 12,017 | 1933 |
| Road "a" Extension over Diaah And Metrorail | Fair | 396.0 ft | 12,000 | 1989 |
| James Monroe Hwy. over Goose Creek | Fair | 190.9 ft | 11,750 | 1987 |
| James Monroe Hiway over Little River | Fair | 91.9 ft | 11,750 | 1990 |
| Belmont Ridge Road over North Fork Broad Run | Fair | 42.0 ft | 11,562 | 1971 |
| Sycolin Road over Goose Creek | Fair | 365.2 ft | 11,403 | 1969 |
| Sycolin Road over Rte. 267-dulles Greenway | Fair | 404.9 ft | 11,403 | 1994 |
| Sycolin Road over Dulles Greenway-rte.267 | Fair | 295.9 ft | 11,403 | 1995 |
| Berlin Turnpike over Richard Creek | Fair | 47.9 ft | 11,147 | 1938 |
| Berlin Turnpike over Trib. Brens Creek | Fair | 44.0 ft | 11,147 | 1938 |
| Berlin Turnpike over North Fork Catoctin Ck. | Fair | 112.9 ft | 11,147 | 1938 |
| River Creek Pkwy. over Tributary Of Cattail Br. | Fair | 24.9 ft | 11,120 | 1997 |
| River Creek PKWY over Cattail Branch | Fair | 35.1 ft | 11,120 | 1997 |
| Pacific BLVD over Cabin Branch | Fair | 239.5 ft | 11,101 | 2010 |
| Evergreen Mills RD over Goose Creek | Fair | 262.1 ft | 10,102 | 1973 |
| Saarinen Circle over Toll Plaza | Fair | 229.3 ft | 10,000 | 1961 |
| Aviation Drive over Diaah | Fair | 235.6 ft | 10,000 | 1961 |
| Old Eastbound Exit over Horsepen Run | Fair | 144.0 ft | 10,000 | 1960 |
| Hirst Road over South Fork Catoctin Ck. | Fair | 105.0 ft | 9,753 | 1987 |
| Waxpool Road over Dulles Greenway | Fair | 234.9 ft | 9,597 | 1994 |
| Woodland RD over Storm Water Pond | Fair | 20.7 ft | 9,225 | 1993 |
| John S. Mosby Hwy. over Little River | Fair | 107.9 ft | 9,058 | 1824 |
| John Mosby Hwy. over Mill Race | Fair | 27.9 ft | 9,058 | 1929 |
| Ashburn Vill. SB over W&od Hike & Bike Trail | Fair | 96.1 ft | 8,851 | 1991 |
| Ashburn Vill. NB over W&od Hike & Bike Trail | Fair | 96.1 ft | 8,851 | 1991 |
| Pleasant Valley RD over Sand Branch | Fair | 32.2 ft | 7,750 | 1965 |
| Ramp-cascades PKWY over Lake Inlet | Fair | 23.0 ft | 7,708 | 1991 |
| Berlin Turnpike over Trib. Of Potomac River | Fair | 28.9 ft | 7,454 | 1932 |
| Route 287 over Potomac Rvr;csx & Mun | Fair | 2430.1 ft | 7,454 | 1953 |
| Sycolin Road over Sycolin Creek | Fair | 133.9 ft | 7,291 | 1988 |
| John S. Mosby Hwy. over Goose Creek | Fair | 214.9 ft | 7,163 | 1954 |
| John S. Mosby Hiwy over Trib. Of Panther Skin Ck | Fair | 22.0 ft | 7,163 | 1954 |
| 620 Braddock Rd. over Foley Branch | Fair | 44.0 ft | 6,669 | 2006 |
| Berlin Turnpike over Milltown Creek | Fair | 37.1 ft | 6,399 | 1942 |
| Evergreen Mills RD over North Fork Of Broad Run | Fair | 43.0 ft | 6,212 | 1973 |
| Berlin Turnpike over S. F. Catoctin Creek | Fair | 44.9 ft | 6,130 | 1970 |
| Ashburn Road over Beaverdam Run | Fair | 115.2 ft | 6,010 | 1959 |
| Silcott Springs RD over North Fork Goose Creek | Fair | 65.0 ft | 5,247 | 1932 |
| Loudoun ST East over Trib.of Sleeter Lake | Fair | 21.3 ft | 5,112 | 1999 |
| South Access Satel over Creek | Fair | 53.8 ft | 5,000 | 1989 |
| North Access Satel over Creek | Fair | 53.8 ft | 5,000 | 1989 |
| Clarkes Gap RD over Br.of Catoctin Creek | Fair | 35.1 ft | 4,648 | 1969 |
| Purcellville Road over Route 7 Bypass | Fair | 191.9 ft | 4,589 | 1987 |
| Hillsboro Road over North Fork Catoctin Ck. | Fair | 66.9 ft | 4,500 | 1955 |
| Edgewater Street over Trib. Elklick Run | Fair | 24.9 ft | 4,365 | 1996 |
| Dry Mill Road over Dry Mill Branch | Fair | 59.1 ft | 4,226 | 1985 |
| James Monroe NB over Dry Run | Fair | 21.0 ft | 4,160 | 1966 |
| Harrison Street over Tuscarora Creek | Fair | 81.0 ft | 4,000 | 1964 |
| Hillsboro Road over S. F. Of Catoctin Creek | Fair | 32.2 ft | 3,791 | 1970 |
| Woodbridge Pkwy. over Trib. Of Potomac River | Fair | 28.9 ft | 3,754 | 1990 |
| Hay Road over Trib. Beaverdam Run | Fair | 42.3 ft | 3,597 | 1997 |
| James Monroe SB over Dry Run | Fair | 22.0 ft | 3,547 | 1957 |
| Milltown Road over N. F. Of Catoctin Creek | Fair | 86.9 ft | 3,476 | 1970 |
| Saint Louis Road over Goose Creek | Fair | 173.2 ft | 3,423 | 1969 |
| Hamilton Sta. Road over Br S Fork Catoctin Creek | Fair | 23.0 ft | 2,748 | 1930 |
| Saint Louis Road over N/f Beaverdam Creek | Fair | 97.1 ft | 2,699 | 1961 |
| Saint Louis Rd. over Beaverdam Creek | Fair | 38.1 ft | 2,578 | 1932 |
| Dry Mill Road over Route 7 Bypass | Fair | 318.9 ft | 2,501 | 1976 |
| Elklick Road over Elk Lick Run | Fair | 82.0 ft | 2,422 | 2002 |
| Old Wheatland Road over South Fork Catoctin Ck. | Fair | 129.9 ft | 2,208 | 1955 |
| Harpers Ferry Road over Piney Run | Fair | 49.9 ft | 2,114 | 1947 |
| Milltown Road over Milltown Creek | Fair | 33.1 ft | 1,957 | 1970 |
| Irish Corner Road over Branch Of Dutchmans Ck. | Fair | 24.3 ft | 1,932 | 1932 |
| Snickersville Rd. over Goose Creek | Fair | 192.9 ft | 1,931 | 1958 |
| Snickersville Rd. over Br Beaverdam Creek | Fair | 24.9 ft | 1,800 | 1966 |
| Paramount Place over Trib Of Cub Run | Fair | 25.9 ft | 1,776 | 2004 |
| Snickersville Tnpk over North Fork Beaverdam Ck. | Fair | 45.9 ft | 1,643 | 1915 |
| Lovettsville Road over Catoctin Creek | Fair | 205.1 ft | 1,460 | 1965 |
| Planting Field DR over Trib. Elklick Run | Fair | 50.9 ft | 1,429 | 2000 |
| Dry Mill Road over Wash. Old Dom. Reg. Trl. | Fair | 25.9 ft | 1,247 | 1892 |
| Lime Kiln Rd. over Tributary Goose Creek | Fair | 33.1 ft | 1,169 | 1989 |
| Lincoln Rd. over North Fork Goose Creek | Fair | 102.0 ft | 1,075 | 1968 |
| Center Street over Trib. Of Elklick Run | Fair | 34.1 ft | 1,074 | 1997 |
| Ramp G Of D.grnway over Dulles Greenway | Fair | 292.0 ft | 1,000 | 1995 |
| Airmont Road over Butchers Creek | Fair | 65.0 ft | 971 | 1942 |
| Taylorstown Road over Catoctin Creek | Fair | 220.1 ft | 918 | 1970 |
| Willisville Road over Panther Skin Creek | Fair | 145.0 ft | 793 | 1957 |
| Foxcroft Road over Goose Creek | Fair | 151.9 ft | 738 | 1972 |
| Foxcroft Road over Tributary Of Goose Creek | Fair | 23.0 ft | 738 | 1972 |
| Foxcroft Road over Tributary Of Goose Creek | Fair | 30.8 ft | 738 | 1972 |
| Auburn Farm RD over Bull Run | Fair | 86.0 ft | 731 | 1966 |
| Lime Kiln Road over North Fork Goose Creek | Fair | 105.0 ft | 717 | 1965 |
| Saint Clair Lane over Clarks Run | Fair | 48.9 ft | 664 | 1977 |
| Dulles Center BLVD over Trib. Of Broad Run | Fair | 22.0 ft | 643 | 1999 |
| Mandolin Street over Trib Of Elklick Run | Fair | 79.4 ft | 619 | 2005 |
| Forest Manor Dr. over Trib.of Broad Run | Fair | 22.0 ft | 601 | 2000 |
| Airmont Road over S Fork Beaverdam Creek | Fair | 38.7 ft | 552 | 1962 |
| Mc Pherson Circle over Trib.of Potomac River | Fair | 27.9 ft | 542 | 1987 |
| Trappe Road over Trib. Panther Skin Creek | Fair | 22.0 ft | 499 | 1925 |
| Stony Point Rd. over N Fork Catoctin Creek | Fair | 49.9 ft | 420 | 1977 |
| Stony Point Road over North Fork Catoctin Ck. | Fair | 24.0 ft | 420 | 1965 |
| Purcellville Road over North Fork Of Catoctin C | Fair | 43.0 ft | 400 | 1976 |
| Foxcroft Road over Beaverdam Creek | Fair | 50.9 ft | 363 | 1925 |
| Telegraph Sprgs RD over N. Fork Goose Creek | Fair | 128.9 ft | 307 | 1957 |
| Mt. Gilead Road over Sycolin Creek | Fair | 26.9 ft | 303 | 1932 |
| Gaver Mill Road over North Fork Catoctin Ck. | Fair | 45.9 ft | 228 | 1977 |
| Hughesville Rd. over Crooked Run | Fair | 53.1 ft | 215 | 1932 |
| Sassafras Road over Simpsons Creek | Fair | 24.9 ft | 214 | 1994 |
| Limestone School R over Tributary Limestone Br. | Fair | 48.9 ft | 211 | 1917 |
| Innisbrook Circle over Trib. Of Jacks Run | Fair | 28.9 ft | 174 | 1989 |
| Loudoun Co. Pkwy. over Tributary Of Russell Br. | Fair | 24.0 ft | 149 | 1990 |
| Champe Ford Road over Little River | Fair | 61.0 ft | 140 | 1908 |
| Yellow Schoolhouse over Branch Of Beaverdam Ck. | Fair | 42.0 ft | 125 | 1974 |
| Simpsons Creek Rd. over Simpsons Creek | Fair | 34.1 ft | 122 | 1930 |
| Bell Road over Route 7 Bypass | Fair | 223.1 ft | 116 | 1987 |
| Yellow Schoolhouse over N. F. Beaverdam Creek | Fair | 47.9 ft | 115 | 1976 |
| Ash George Road over Richards Creek | Fair | 34.1 ft | 107 | 1932 |
| Snake Hill Road over Tributary Of Goose Creek | Fair | 30.8 ft | 104 | 1972 |
| Greggsville Rd. over Trib. North Fork Creek. | Fair | 25.9 ft | 99 | 1959 |
| Greengarden Road over Panther Skin Creek | Fair | 40.0 ft | 78 | 1916 |
| Greengarden Road over Jeffries Branch | Fair | 35.1 ft | 78 | 1932 |
| Sawmill Lane over Piney Run | Fair | 25.6 ft | 68 | 1964 |
| Downey Mill Road over Br. Of Catoctin Creek | Fair | 25.9 ft | 59 | 1971 |
| Paxson Road over North Fork Beaverdam Ck. | Fair | 33.1 ft | 58 | 1949 |
| Featherbed Lane over Milltown Creek | Fair | 41.3 ft | 57 | 1971 |
| Featherbed Lane over Br Of Catoctin Creek | Fair | 21.7 ft | 57 | 1987 |
| Unison Road over Dog Branch | Fair | 55.1 ft | 51 | 1955 |
| Quaker Lane over Beaverdam Creek | Fair | 35.1 ft | 48 | 1915 |
| Rte. 28 SB over Dulles Access Road | Good | 387.1 ft | 93,735 | 1988 |
| Waxpool Road over Trib. Of Broad Run | Good | 38.1 ft | 61,481 | 1987 |
| Waxpool Road over Rte. 28 - Sully Road | Good | 305.1 ft | 61,481 | 2004 |
| Route 7 Bypass over Trib.s.fork Catoctin Ck. | Good | 24.0 ft | 57,955 | 1980 |
| Harry Byrd HWY Ebl over Rte.1582 Algonkian PKWY | Good | 204.1 ft | 37,893 | 1999 |
| Harry Byrd HWY WB over Rte.1582 Algonkian PKWY | Good | 204.1 ft | 37,893 | 2002 |
| Route 606 over Cabin Branch | Good | 32.2 ft | 35,050 | 2017 |
| Waxpool RD Eb&wb over Broad Run | Good | 352.0 ft | 30,740 | 2004 |
| Dulles Greenway over Trib. Beaverdam Run | Good | 21.0 ft | 30,365 | 1995 |
| Ramp D From RT 7wb over Route 7 | Good | 288.1 ft | 29,645 | 1990 |
| Route 7 Bp;ebl over Ivandale Road & RTE 709 | Good | 107.0 ft | 29,212 | 1995 |
| Rte. 7 Bypass EB over Hamilton Station Road | Good | 112.9 ft | 28,977 | 1994 |
| Cascades Parkway over Trib. Cabin Branch | Good | 21.0 ft | 26,148 | 1994 |
| Rte. 7 Wbl over Tuscarora Ck.&hike-bike | Good | 149.9 ft | 26,102 | 1972 |
| James Madison HWY over Limestone Branch | Good | 42.0 ft | 25,827 | 1989 |
| Sterling Blvd. over Rte.28 Sully Rd. | Good | 220.1 ft | 25,254 | 2006 |
| Church Road over Cabin Branch | Good | 35.1 ft | 22,669 | 1996 |
| Church Road over Branch Of Cabin Creek | Good | 42.0 ft | 22,669 | 1996 |
| Church Road over W&od Hike & Bike Trail | Good | 63.0 ft | 22,669 | 2006 |
| Ramp "p" over Ramps "r" And "s" | Good | 198.8 ft | 22,000 | 2007 |
| Ramp "p" over Horsepen Run | Good | 143.7 ft | 22,000 | 2007 |
| Algonkian Parkway over Sugarland Run | Good | 448.2 ft | 19,332 | 1990 |
| Route 7 Bypass Ebl over Route 7 Business | Good | 232.0 ft | 19,283 | 1995 |
| Rte.7 Bypass Ebl over South Fork Catoctin Ck. | Good | 210.0 ft | 19,283 | 1995 |
| Rte.7 Bypass Ebl over South Fork Catoctin Ck. | Good | 180.1 ft | 19,283 | 1995 |
| Route 7 Bp; Ebl over Berlin Tpke; Route 287 | Good | 207.0 ft | 19,283 | 1995 |
| Charles Twn Pk Rmp over W & Od Trail | Good | 27.9 ft | 18,000 | 2015 |
| Ashburn Farm Pkwy. over Beaver Dam Run | Good | 53.1 ft | 17,896 | 1992 |
| Arcola Mills Drive over Trib Broad Run | Good | 20.7 ft | 17,632 | 2024 |
| Catoctin Circle over Town Branch | Good | 50.9 ft | 17,441 | 1979 |
| Harry Byrd Highway over Airmont Road - 719 | Good | 97.1 ft | 17,199 | 1995 |
| Belmont Ridge Road over Dulles Greenway & Ramp D | Good | 359.9 ft | 16,679 | 1995 |
| Battlefield PKWY over Trib Of Tuscaroa Creek_ | Good | 24.9 ft | 16,616 | 2009 |
| Battlefield PKWY over East Market Street | Good | 173.9 ft | 16,616 | 2021 |
| Ashburn Vill. Blv over Dulles Greenway | Good | 247.0 ft | 16,326 | 1994 |
| Old Ox Rd. SB over Emergency Spillway | Good | 256.9 ft | 15,172 | 2017 |
| Old Ox Rd. NB over Emergency Spillway | Good | 256.9 ft | 15,172 | 2017 |
| Loudoun County Pkw over Tributary Of Broad Run | Good | 21.7 ft | 15,113 | 2006 |
| Loudoun County Pkw over Tributary Of Broad Run | Good | 29.9 ft | 15,113 | 2006 |
| Loudoun Co. PKWY over Trib. Of Elklick Run | Good | 86.9 ft | 14,544 | 1999 |
| Loudoun Co. PKWY over Trib. Of Elklick Run | Good | 70.2 ft | 14,544 | 2005 |
| Tall Cedars Pkwy. over Trib. Of Elklick Run | Good | 26.9 ft | 14,539 | 1999 |
| Loudoun Co. Pkwy. over Trib. Of Broad Run | Good | 25.9 ft | 14,503 | 2006 |
| Loudoun Co. Pkwy. over Trib Of Broad Run | Good | 34.1 ft | 14,503 | 2009 |
| Loudoun Co. Pkwy. over Trib. Of Broad Run | Good | 22.0 ft | 14,503 | 2009 |
| Ryan Road over Trib. Of Broad Run | Good | 37.4 ft | 14,231 | 2000 |
| Ryan Road over Trib. Of Broad Run | Good | 25.9 ft | 14,231 | 2000 |
| Ashburn Vill.blvd. over Russell Branch | Good | 23.0 ft | 14,212 | 1992 |
| Ashburn Village Bd over Ebl & Wbl Leesburg Pike | Good | 279.2 ft | 14,212 | 2017 |
| Ashburn Vill BLVD over Trib Of Russell Branch | Good | 22.0 ft | 14,212 | 2017 |
| Algonkian Parkway over Trib.of Potomac River | Good | 22.0 ft | 13,907 | 1985 |
| Belmont Ridge RD over Trib Of Beaverdam Run | Good | 65.0 ft | 13,228 | 2023 |
| EB Dulles Greenway over Trib. Of Sycolin Creek | Good | 154.9 ft | 13,153 | 1994 |
| Claiborne Parkway over Trib. Of Beaverdam Run | Good | 36.1 ft | 13,117 | 2000 |
| Claiborne Parkway over Trib. Of Beaverdam Run | Good | 29.9 ft | 13,117 | 2000 |
| Saarinen Circle over Commercial Vehicle Drive | Good | 137.1 ft | 13,000 | 1993 |
| Old EB Airport Roa over Horsepen Run | Good | 134.8 ft | 13,000 | 2007 |
| Ramp "r" over Va Route 28 | Good | 335.3 ft | 13,000 | 1994 |
| Braddock Road over Elk Lick Run | Good | 148.0 ft | 12,710 | 2002 |
| Braddock Rd. over Tributary Of Elklick Run | Good | 42.0 ft | 12,710 | 2006 |
| Gum Springs Road over Quarry Tunnel | Good | 20.3 ft | 12,604 | 2012 |
| Pacific Blvd. over Indian Creek | Good | 74.1 ft | 12,561 | 2008 |
| Belmont Ridge Road over Route 7 | Good | 245.1 ft | 11,562 | 2017 |
| Belmont Ridge Road over Cain Branch | Good | 36.1 ft | 11,562 | 2013 |
| River Creek Pkwy. over Leesburg Pike | Good | 223.1 ft | 11,434 | 2008 |
| South Riding Blvd. over Trib. Of Elklick Run | Good | 34.1 ft | 11,230 | 1997 |
| Ramp From 773 over Gas Utilities | Good | 100.1 ft | 10,989 | 2008 |
| Rte.3171 over Wetlands | Good | 149.9 ft | 10,638 | 2004 |
| Battlefield Pkwy. over Cattail Branch | Good | 22.0 ft | 10,608 | 2005 |
| Battlefield PKWY over Trib. Of Cattail Branch | Good | 35.8 ft | 10,608 | 2011 |
| Evergreen Mills RD over Sycoline Creek | Good | 43.0 ft | 10,362 | 1973 |
| John S Mosby Hiwy over South Fork Broad Run | Good | 24.9 ft | 9,865 | 1974 |
| Ashburn Farm PKWY over Trib. Of Beaver Dam Run | Good | 30.8 ft | 9,660 | 1996 |
| Waxpool Road over Beaverdam Run | Good | 41.0 ft | 9,597 | 2003 |
| Augusta Drive over Trib. Sugarland Run | Good | 24.6 ft | 9,497 | 2000 |
| Belmont Ridge RD over Trib Of Goose Creek | Good | 33.1 ft | 9,295 | 2017 |
| Battlefld Pkwy. WB over Tuscarora Creek | Good | 1243.1 ft | 8,308 | 2009 |
| Battlefld Pkwy. EB over Tuscarora Creek | Good | 1243.1 ft | 8,308 | 2009 |
| Belmont Ridge RD over W&od Trail | Good | 161.1 ft | 8,050 | 2018 |
| Ryan Road over Trib Of Beaverdam Creek | Good | 20.7 ft | 8,031 | 2021 |
| Demott Drive over Trib. Of Beaverdam Run | Good | 32.2 ft | 8,000 | 2005 |
| Creighton Road over Trib Of Broad Run | Good | 24.0 ft | 7,952 | 2013 |
| Plaza Street over Tuscarora Creek | Good | 331.0 ft | 7,895 | 1996 |
| Plaza Street over W & Od Hike & Bike Trail | Good | 44.0 ft | 7,895 | 1996 |
| Sycolin Road over Rte.7 & 15 Bypass | Good | 259.8 ft | 7,895 | 2014 |
| Claiborne Pkwy. NB over Rte.7 Leesburg Pike | Good | 213.9 ft | 7,632 | 2005 |
| Claiborne Pkwy. SB over Rte.7 Leesburg Pike | Good | 213.9 ft | 7,632 | 2005 |
| King ST & Rt15 Bus over Original Town Branch | Good | 22.0 ft | 6,675 | 1932 |
| King St. Rt.15 Bus over Town Branch | Good | 42.0 ft | 6,675 | 1980 |
| Braddock Rd. over Trib Of Bull Run | Good | 22.0 ft | 6,669 | 2008 |
| Broadlands Blvd. over Trib. Of Beaverdam Run | Good | 30.8 ft | 6,591 | 2001 |
| Nokes Blvd__ebl over Rte.28 Sully Rd. | Good | 289.0 ft | 6,428 | 2009 |
| Nokes Blvd.__wbl over Rte.28 Sully Rd. | Good | 289.0 ft | 6,428 | 2008 |
| Gloucester Pkwy. over Bearverdam Run | Good | 228.0 ft | 6,428 | 2008 |
| Gloucester PKWY over Beaverdam Run | Good | 228.0 ft | 6,428 | 2008 |
| Gloucester PKWY over Broad Run | Good | 1317.9 ft | 6,428 | 2016 |
| Gloucester PKWY over Broad Run | Good | 1317.9 ft | 6,428 | 2016 |
| Shellhorn Rd. over Beaverdam Run | Good | 51.8 ft | 6,278 | 2008 |
| Ramp C Of Route 7 over Tributary Of Broad Run | Good | 21.0 ft | 6,000 | 1990 |
| Russel Branch PKWY over Trib Of Russel Branch | Good | 32.8 ft | 5,810 | 2016 |
| Hillsboro Road over Route 7 Bypass | Good | 294.0 ft | 5,592 | 1987 |
| Croson Lane over Br. Of Beaverdam Run | Good | 25.9 ft | 5,566 | 2007 |
| Pacific Blvd. NB over W & Od Trail | Good | 129.9 ft | 5,550 | 2010 |
| Pacific Blvd. SB over W & Od Trail | Good | 129.9 ft | 5,550 | 2010 |
| Old Ryan Road over Stream | Good | 21.7 ft | 5,500 | 2017 |
| City Center Blvd. over Trib Of Board Run | Good | 21.0 ft | 5,321 | 1998 |
| Relocation Drive over Indian Creek | Good | 44.0 ft | 5,180 | 1987 |
| Sycolin Rd. over Trib. Of Tuscarora Ck. | Good | 24.9 ft | 5,112 | 2014 |
| Riding Center Dr. over Trib. Of Elklick Run | Good | 49.9 ft | 5,110 | 2005 |
| Ashburn Village Bl over Trib.of Broad Run | Good | 35.1 ft | 5,000 | 1997 |
| Hatcher Ave. over S Fork Catactin Creek | Good | 44.0 ft | 4,589 | 1987 |
| Tripleseven Road over Trib.of Potomac River | Good | 32.2 ft | 4,581 | 1997 |
| Innovation Dr. over Rte.28 Sully Rd. | Good | 250.0 ft | 4,428 | 2012 |
| Cochran Mill Road over Tuscarora Creek | Good | 80.1 ft | 4,126 | 2019 |
| Belmont Ridge Rd. over W. & Od Trail | Good | 161.1 ft | 4,025 | 2017 |
| Edgewater St. over Trib. Of Elklick Run | Good | 89.9 ft | 3,828 | 2000 |
| Edgewater Drive over Trib. Of Elklick Run | Good | 30.8 ft | 3,828 | 2000 |
| Airmont Road over Simpsons Creek | Good | 22.0 ft | 3,827 | 1989 |
| Stone Spring Blvd. over Trib Of Broad Run | Good | 33.8 ft | 3,793 | 2014 |
| Hay Road over Trib Of Beaverdam Run | Good | 24.9 ft | 3,597 | 1965 |
| Bull Run P.o. Road over Trib. Elklick Run | Good | 35.1 ft | 3,478 | 2011 |
| Milltown Road over Branch Of Catoctin Creek | Good | 86.9 ft | 3,476 | 1970 |
| Ridgeway Dr. over Trib. Of Beaverdam Run | Good | 25.6 ft | 3,468 | 2001 |
| River Bank Street over Trib. Of Sugarland Run | Good | 30.8 ft | 3,297 | 2000 |
| Russel Branch PKWY over Trib Of Broad Run | Good | 59.1 ft | 2,850 | 2008 |
| Russle Branch PKWY over Trib Of Broad Run | Good | 33.1 ft | 2,850 | 2008 |
| Exchange Street over Russell Branch | Good | 56.1 ft | 2,762 | 2008 |
| Marblehead Drive over Trib. Of Beaverdam Run | Good | 35.1 ft | 2,698 | 2012 |
| Shreve Mill Road over Dulles Greenway | Good | 238.8 ft | 2,320 | 1995 |
| Claiborne PKWY over Trib. Of Broad Run | Good | 44.0 ft | 2,166 | 2018 |
| Summerall Dr. over Trib. Of Elklick Run | Good | 38.4 ft | 2,122 | 2007 |
| Innovation Drive over Trib. Horsepen Run | Good | 37.7 ft | 2,086 | 2000 |
| Allder School Road over Trib. Of Sf Catoctin Ck. | Good | 34.4 ft | 2,086 | 2018 |
| Snickersville Road over Beaverdam Creek | Good | 124.0 ft | 2,060 | 1820 |
| South Street over Trib.of Town Branch | Good | 24.9 ft | 2,000 | 1975 |
| Gate 14 Access Rd. over Dulles Greenway | Good | 653.9 ft | 2,000 | 1995 |
| Meade Dr. over Trib.of Tuscarora Creek | Good | 30.8 ft | 2,000 | 2000 |
| Ramp A From Rte.28 over Indian Creek | Good | 40.0 ft | 2,000 | 2006 |
| Irish Corner Road over Dutchman Creek | Good | 25.9 ft | 1,932 | 1975 |
| Greenway Drive over Trib. Upper Tuscarora Ck | Good | 30.8 ft | 1,920 | 1994 |
| Gleedsville Rd. over Sycolin Creek | Good | 71.5 ft | 1,908 | 2012 |
| Atlantic Blvd. over Cabin Branch | Good | 42.0 ft | 1,900 | 1990 |
| Rte.659 Northstar over Wetlands | Good | 22.0 ft | 1,800 | 2004 |
| Dry Mill Road over Town Branch | Good | 33.1 ft | 1,763 | 1992 |
| Snickersville Road over Tributary Of Goose Creek | Good | 33.1 ft | 1,754 | 1993 |
| Center Street over Trib. Of Elklick Run | Good | 89.9 ft | 1,699 | 1999 |
| Woods Edge Dr. over Trib.of Cattail Branch | Good | 22.0 ft | 1,500 | 2005 |
| Ramp "g" over Diaah And Metrorail | Good | 433.4 ft | 1,500 | 1996 |
| Ramp "g" over Horsepen Run | Good | 302.2 ft | 1,500 | 1995 |
| Destiny Dr. over Trib Elklick Run | Good | 23.0 ft | 1,378 | 2005 |
| Old Ryan Road over Trib Of Beaverdam Run | Good | 81.0 ft | 1,374 | 2009 |
| Hope Pkwy. over Trib.of Upper Tuscarora | Good | 38.1 ft | 1,360 | 2006 |
| Cedar Ridge Blvd. over Trib Of Bull Run | Good | 43.6 ft | 1,312 | 2005 |
| Dry Mill Road over Dry Mill Branch | Good | 35.1 ft | 1,247 | 1985 |
| Hillsboro Hunt Dr. over Trib.of Broad Run | Good | 36.1 ft | 1,223 | 2002 |
| Lincoln Road over Trib. Of N.fork Goose CR | Good | 20.0 ft | 1,075 | 1967 |
| Mink Meadow Street over Trib. Elklick Run | Good | 43.0 ft | 1,039 | 1999 |
| Belcourt Castle DR over Trib. Of Elklick Run | Good | 22.0 ft | 1,020 | 2006 |
| Ramp F From Rte.28 over Indian Creek | Good | 43.0 ft | 1,000 | 2006 |
| Zion Chapel Dr. over Tributary Of Broad Run | Good | 33.1 ft | 1,000 | 2008 |
| Atlantic BLVD over W&od Trail & Ruritan RD | Good | 175.2 ft | 1,000 | 2011 |
| Garriland Road over Trib To Limestone Branch | Good | 65.0 ft | 1,000 | 2007 |
| Founders Dr. over North Fork Broad Run | Good | 129.6 ft | 1,000 | 2011 |
| Winning Glory Dr. over Foley Branch | Good | 43.3 ft | 1,000 | 2016 |
| Ramp "g" over Economy Parking Connecto | Good | 57.7 ft | 1,000 | 1992 |
| Russel Branch PKWY over Broad Run | Good | 478.0 ft | 864 | 2016 |
| Raspberry Drive over Trib. Limestone Branch | Good | 68.9 ft | 816 | 1993 |
| Blossum Drive over Cabin Branch | Good | 38.1 ft | 800 | 1997 |
| Loudoun Reserve DR over Trib.of Broad Run | Good | 210.0 ft | 800 | 2006 |
| Hyland Hills St. over Trib.of Elklick Run | Good | 44.0 ft | 712 | 1999 |
| Golf View Drive over Trib. Elklick Run | Good | 36.1 ft | 672 | 2000 |
| Nations Drive over Elklick Run | Good | 64.0 ft | 649 | 2004 |
| East A Street over Unknown Waterway | Good | 25.9 ft | 600 | 2012 |
| Locust Grove Drive over S.fork Of Catoctin Creek | Good | 24.0 ft | 600 | 2012 |
| Crossfield Dr. over Trib.of Elklick Run | Good | 25.9 ft | 509 | 2005 |
| Avonlea Drive over Trib. Of Elklick Run | Good | 42.0 ft | 500 | 2011 |
| Bloomfield Path over Lenah Run | Good | 111.9 ft | 500 | 2014 |
| Valleybrook La. over Trib Of Sycolin Creek | Good | 24.9 ft | 500 | 2004 |
| Ivybridge La. over Trib Of Sycolin Creek | Good | 24.9 ft | 500 | 2004 |
| Trailhead Drive over S.fork Broad Run | Good | 54.1 ft | 500 | 2013 |
| Trailhead Drive over S.fork Broad Run | Good | 32.8 ft | 500 | 2013 |
| Grassland Grove over Lenah Run | Good | 111.9 ft | 500 | 2015 |
| Centergate Drive over Trib Of Broad Run | Good | 29.9 ft | 500 | 2008 |
| Donegal Drive over Branch Of Elklick Run | Good | 48.9 ft | 486 | 2003 |
| Donegal Drive over Branch Of Elklick Run | Good | 21.0 ft | 486 | 2004 |
| Montresor Rd. over Trib Of Limestone Branch | Good | 23.3 ft | 370 | 2011 |
| Bankfield Dr. over Trib Of Catoctin Creek | Good | 22.0 ft | 330 | 2003 |
| Childrens Center R over Route 7 Bypass | Good | 190.9 ft | 325 | 1976 |
| Allder School Road over South Fork Catoctin Ck. | Good | 49.9 ft | 313 | 2018 |
| Deer Meadow Path over Trib.of Tuscarora Creek | Good | 32.2 ft | 300 | 2000 |
| Barbaras Bluff Ct. over Trib Of Catoctin Creek | Good | 26.9 ft | 300 | 2008 |
| W.t. Druhan Blvd. over Trib Of Crooked Run | Good | 26.9 ft | 300 | 2012 |
| Berkhamstead Drive over Trib Of Limestone Branch | Good | 35.1 ft | 300 | 2015 |
| Davis Drive over Trib Of Indian Creek | Good | 22.0 ft | 300 | 1990 |
| Allder School Road over South Fork Catoctin Ck | Good | 23.0 ft | 291 | 2016 |
| Bettis Drive over Br. Of Catoctin Creek | Good | 21.7 ft | 279 | 2007 |
| Creamer Lane over N Fork Catoctin Creek | Good | 20.3 ft | 263 | 2023 |
| Newberry Crossing over Trib Of Sleeter Lake | Good | 24.3 ft | 252 | 2006 |
| Greenleaf Place over Trib Of Simpsons Creek | Good | 21.0 ft | 247 | 2006 |
| Browns Creek Pl. over Tirb. Of Big Branch | Good | 34.1 ft | 234 | 2005 |
| Limestone School R over Tributary Of Potomac Rv. | Good | 20.0 ft | 211 | 1996 |
| Wright Farm Drive over South Fork Catoctin | Good | 90.9 ft | 200 | 2012 |
| Lennox Hale Drive over Trib Of Foley Branch | Good | 42.0 ft | 200 | 2013 |
| Conservancy Dr. over Trib Of Beaverdam Creek | Good | 27.9 ft | 200 | 2012 |
| Mill Wheel Place over Lenah Run | Good | 34.1 ft | 200 | 2015 |
| Maplehurst Drive over Trib Of Lenah Run | Good | 38.1 ft | 200 | 2017 |
| Hampton Rd. over Catoctin Creek | Good | 43.0 ft | 181 | 1978 |
| Telegraph Spring over Trib.of Goose Creek | Good | 35.1 ft | 175 | 1998 |
| Shelburn Glebe Rd. over North Fork Goose Creek | Good | 91.9 ft | 174 | 2004 |
| Maple Cross Street over Trib. Of Elklick Run | Good | 33.1 ft | 165 | 1999 |
| Franklin Ford Pl. over Trib.of North Fork Goose | Good | 33.8 ft | 163 | 2005 |
| Loudoun Co. Pkwy. over North Fork Of Russell Br | Good | 42.0 ft | 149 | 2006 |
| Loudoun County Pkw over Rte. 7 | Good | 220.5 ft | 149 | 2010 |
| Piggott Bottom Rd. over Trib Of Catoctin Creek | Good | 42.0 ft | 144 | 2023 |
| Lutheran Church RD over Trib Milltown Creek | Good | 22.0 ft | 120 | 2017 |
| Heaters Island Ct. over Trib. Of Limestone Br. | Good | 24.9 ft | 110 | 2007 |
| Nautical Jive Dr. over Trib. Of Potomac River | Good | 37.1 ft | 105 | 2006 |
| Courtland Vill. DR over Trib. Of Big Branch | Good | 36.1 ft | 100 | 2005 |
| Success Drive over Foley Branch | Good | 76.8 ft | 100 | 2013 |
| Aldie Dam Road over Little River | Good | 44.9 ft | 96 | 1989 |
| Forest Mills Road over Trib Of Crooked Run | Good | 69.9 ft | 93 | 2017 |
| Tail Race Road over Trib. Of Little River | Good | 24.0 ft | 85 | 1974 |
| Dutchmans Creek RD over Dutchmans Creek | Good | 34.4 ft | 80 | 2022 |
| Loudoun Co. PKWY over Beaverdam Run | Good | 90.9 ft | 74 | 2006 |
| Loudoun Co. Pkwy. over Beaverdam Run | Good | 90.9 ft | 74 | 2006 |
| Equine Path Way over Trib Of Bull Run | Good | 22.0 ft | 72 | 2008 |
| Woodtrail Road over North Fork Beaverdam Ck. | Good | 60.0 ft | 69 | 1978 |
| Canongate Drive over Trib. Of Dry Mill Branch | Good | 22.0 ft | 60 | 2003 |
| Featherbed Lane over Catoctin Creek | Good | 161.1 ft | 57 | 1925 |
| Farewell Dance Dr. over Trib. Of Potomac River | Good | 32.2 ft | 47 | 2006 |
| Turneysville Road over Piney Branch | Good | 56.1 ft | 35 | 1973 |
| Arnold Lane over Piney Branch | Good | 29.5 ft | 30 | 1932 |