| SR 544 over Nooksack R Overflow | Poor | 38.1 ft | 10,205 | 1994 |
| SR 542 over Overflow Channel No 2 | Poor | 67.9 ft | 10,027 | 1948 |
| Electric Avenue over Whatcom Creek | Poor | 57.1 ft | 8,500 | 1959 |
| NB SR 539 over Nooksack R | Poor | 576.1 ft | 7,931 | 1950 |
| Marine DR over Access RD Creek Old Rr | Poor | 270.0 ft | 7,694 | 1933 |
| Marine DR over Bnsf Rr | Poor | 195.9 ft | 6,344 | 1940 |
| SR 542 over Bell Creek | Poor | 95.1 ft | 5,312 | 1951 |
| Meador Avenue over Whatcom Creek | Poor | 56.4 ft | 3,700 | 1936 |
| SR 542 over Cornell Creek | Poor | 121.1 ft | 1,951 | 1931 |
| SR 547 over Saar Creek | Poor | 32.2 ft | 1,522 | 1970 |
| SR 542 over Fossil Creek | Poor | 59.1 ft | 1,283 | 1934 |
| SR 542 over Glacier Creek | Poor | 85.0 ft | 1,283 | 1956 |
| SR 542 over Chain Up Creek | Poor | 37.1 ft | 1,283 | 2010 |
| Goshen RD over Anderson CR | Poor | 62.0 ft | 1,114 | 1973 |
| Jackson RD over Terrell CR | Poor | 62.0 ft | 1,037 | 1975 |
| Lake Samish DR N over Lake Samish | Poor | 251.0 ft | 955 | 1953 |
| SR 542 over Bagley Creek | Poor | 54.1 ft | 636 | 1946 |
| Martin RD over Anderson CR | Poor | 30.8 ft | 80 | 1958 |
| Road over Thompson Creek | Poor | 29.9 ft | 64 | 1966 |
| Salakanum Wy over Anderson Creek | Poor | 30.8 ft | 50 | 1954 |
| I-5 over Orchard Dr/squalicum CR | Fair | 290.7 ft | 39,925 | 1958 |
| I-5 over Orchard Dr/squalicum CR | Fair | 290.7 ft | 39,925 | 1958 |
| I-5 over Meador AVE | Fair | 279.9 ft | 38,169 | 1957 |
| I-5 over Meador AVE | Fair | 226.0 ft | 38,169 | 1957 |
| I-5 over Iowa ST | Fair | 138.1 ft | 33,565 | 1957 |
| I-5 over Whatcom Creek | Fair | 119.1 ft | 33,565 | 1957 |
| I-5 over Whatcom Creek | Fair | 153.9 ft | 33,565 | 1957 |
| I-5 over Lakeway Drive | Fair | 84.0 ft | 32,863 | 1958 |
| I-5 over Lakeway Drive | Fair | 84.0 ft | 32,863 | 1958 |
| I-5 over Northwest AVE | Fair | 153.9 ft | 26,759 | 1958 |
| I-5 over Northwest AVE | Fair | 153.9 ft | 26,759 | 1958 |
| I-5 over SR 539 | Fair | 170.6 ft | 26,088 | 1958 |
| I-5 over SR 539 Meridian ST | Fair | 170.9 ft | 26,088 | 1958 |
| I-5 over Nooksack River | Fair | 905.8 ft | 25,301 | 1955 |
| I-5 over Nooksack River | Fair | 897.0 ft | 25,301 | 1971 |
| I-5 over SR 11 (connelly Ave) | Fair | 169.0 ft | 22,194 | 1962 |
| Main Street over Nooksack River | Fair | 429.1 ft | 21,350 | 1950 |
| I-5 over Portal Way | Fair | 132.9 ft | 18,530 | 1963 |
| I-5 over Portal Way | Fair | 132.9 ft | 18,530 | 1963 |
| Alabama ST over I-5 | Fair | 162.1 ft | 17,997 | 1958 |
| Slater RD over Nooksack River | Fair | 246.1 ft | 12,802 | 1957 |
| Woburn Street over Whatcom Creek | Fair | 65.9 ft | 11,900 | 1989 |
| Slater RD over I-5 | Fair | 319.9 ft | 11,783 | 1972 |
| Slater RD over Red River | Fair | 104.0 ft | 11,365 | 1900 |
| SR 11 over Padden Creek | Fair | 330.1 ft | 10,799 | 1932 |
| Northwest Avenue over Squallicum Wy Crk Cmstp& | Fair | 328.7 ft | 10,700 | 1971 |
| Birch Bay-lynden R over I-5 | Fair | 272.0 ft | 10,381 | 1961 |
| Hannegan RD over Nooksack River | Fair | 319.9 ft | 9,332 | 1934 |
| I-5 over Dakota CR & West RD | Fair | 393.0 ft | 8,738 | 1961 |
| I-5 over Dakota CR & West RD | Fair | 393.0 ft | 8,738 | 1961 |
| SR 548/grandview over I-5 | Fair | 263.1 ft | 8,734 | 1962 |
| Holly Street over Whatcom Creek | Fair | 32.2 ft | 8,700 | 1922 |
| Dupont Prospect ST over Whatcom Creek | Fair | 67.9 ft | 8,700 | 1920 |
| Birch Bay Lynden over Bertrand CR | Fair | 83.0 ft | 8,369 | 1949 |
| Cornwall Avenue over Whatcom Creek | Fair | 35.1 ft | 8,000 | 1968 |
| NB SR 539 over Nooksack R Overflow | Fair | 323.2 ft | 7,931 | 1950 |
| Ellis ST Ext over Whatcom Crk | Fair | 64.0 ft | 7,900 | 1981 |
| Roeder AVE over Whatcom Creek/waterway | Fair | 500.0 ft | 7,800 | 1995 |
| SR 548 over Dakota Creek | Fair | 184.1 ft | 7,776 | 1930 |
| Roeder AVE over Bnsf Rr | Fair | 430.1 ft | 7,500 | 1988 |
| Roeder Avenue over Squallicum Creek | Fair | 45.9 ft | 7,200 | 1962 |
| Eldridge Avenue over Squallicum Crk-cmstp&p R | Fair | 357.9 ft | 6,400 | 1937 |
| Birchwood Ave. over Bug Lake Overflow | Fair | 24.0 ft | 6,200 | 1987 |
| Front Street over Fishtrap Creek | Fair | 34.1 ft | 6,187 | 1947 |
| Chestnut St-bay ST over Burlington Northern | Fair | 299.9 ft | 6,000 | 1930 |
| Drayton Harbor RD over California CR | Fair | 104.0 ft | 5,920 | 1933 |
| Haxton Wy over Red River | Fair | 126.0 ft | 5,592 | 1920 |
| SR 542 over Coal Creek | Fair | 57.1 ft | 5,312 | 1946 |
| SR 542 over Kendall Creek | Fair | 91.9 ft | 5,312 | 1964 |
| SR 9 over Johnson Creek | Fair | 104.0 ft | 4,919 | 1961 |
| Northwest DR over Ten Mile CR | Fair | 83.0 ft | 4,900 | 1935 |
| I-5 Off Ramp over SR 539 Creek | Fair | 520.0 ft | 4,546 | 1988 |
| Squallicum Way over Squallicum Creek | Fair | 27.9 ft | 4,200 | 1970 |
| Squallicum Way over Squallicum Creek | Fair | 26.9 ft | 4,200 | 1970 |
| Squallicum Way over Squallicum Creek | Fair | 420.9 ft | 4,200 | 1970 |
| Smith RD E over Anderson Creek | Fair | 53.1 ft | 4,147 | 2005 |
| SR 9 over N Fk Nooksack River | Fair | 410.1 ft | 4,066 | 1954 |
| Marine DR over Nooksack River | Fair | 419.9 ft | 3,900 | 1936 |
| Commercial/young over Whatcom Creek | Fair | 28.9 ft | 3,900 | 1957 |
| SR 548 over California CR | Fair | 104.0 ft | 3,810 | 1924 |
| SR 9 over Creek | Fair | 33.1 ft | 3,517 | 1952 |
| SR 9 over Slough | Fair | 36.1 ft | 3,517 | 1952 |
| E. Bakerview Road over Squalicum Creek | Fair | 38.1 ft | 3,500 | 1935 |
| Samish Way over I-5 | Fair | 269.4 ft | 3,304 | 1962 |
| Cornwall Avenue over Burlington Northern | Fair | 113.2 ft | 3,100 | 1964 |
| Grand Avenue over Whatcom Creek | Fair | 32.2 ft | 2,800 | 1949 |
| Hampton RD over Kamm Slough | Fair | 145.0 ft | 2,400 | 2010 |
| South Pass RD over Swift CR | Fair | 82.0 ft | 2,340 | 1935 |
| Alderson RD over Terrell Creek | Fair | 49.9 ft | 2,184 | 1987 |
| SR 542 over Maple Creek | Fair | 35.1 ft | 1,985 | 1900 |
| SR 542 over N Fk Nooksack R Warnick | Fair | 251.0 ft | 1,951 | 1931 |
| Lake Whatcom BLVD over Unnamed Creek | Fair | 228.3 ft | 1,880 | 2006 |
| Loomis Trail RD over Bertrand CR | Fair | 126.0 ft | 1,839 | 1938 |
| SR 20 over Gorge Creek | Fair | 247.0 ft | 1,696 | 1955 |
| SR 20 over Half Br Sta 155 | Fair | 62.7 ft | 1,696 | 1900 |
| SR 20 over Half Br Sta 163 | Fair | 78.1 ft | 1,696 | 1962 |
| SR 20 over Goodell Creek | Fair | 253.9 ft | 1,696 | 1972 |
| Delta Line RD over Dakota CR | Fair | 30.8 ft | 1,500 | 1965 |
| Goodwin RD over Swift CR | Fair | 38.1 ft | 1,443 | 1934 |
| SR 20 over Thunder Arm Bay | Fair | 210.0 ft | 1,322 | 1961 |
| Barrett RD over Barrett Creek | Fair | 57.1 ft | 1,316 | 1969 |
| Gooseberry Spur over Hale Passage | Fair | 69.9 ft | 1,300 | 1950 |
| Gooseberry Spur over Hale Passage | Fair | 158.1 ft | 1,300 | 1950 |
| Gooseberry Spur over Hale Passage | Fair | 60.0 ft | 1,300 | 1978 |
| Gooseberry Spur over Hale Passage | Fair | 96.1 ft | 1,300 | 1978 |
| SR 542 over Slide Area | Fair | 102.0 ft | 1,283 | 1938 |
| Breckinridge RD over Sumas River | Fair | 82.0 ft | 1,274 | 1954 |
| Telegraph RD N over Sumas River | Fair | 82.0 ft | 1,272 | 1943 |
| H Street RD over Bertrand Cr. | Fair | 118.1 ft | 1,248 | 1995 |
| Aldrich RD over Ten Mile Cr. | Fair | 38.1 ft | 1,192 | 1924 |
| SR 20 over Lillian CR | Fair | 402.9 ft | 1,173 | 1971 |
| SR 20 over Panther CR | Fair | 357.0 ft | 1,173 | 1972 |
| Portal Wy over Dakota CR | Fair | 335.0 ft | 1,149 | 1928 |
| N 17th Street over Fishtrap Creek | Fair | 25.9 ft | 1,140 | 1975 |
| Telegraph RD N over Sumas River | Fair | 61.0 ft | 1,120 | 1953 |
| Deming RD over Smith Creek Overflow | Fair | 84.0 ft | 1,112 | 1946 |
| Valley View RD over Dakota CR | Fair | 75.1 ft | 1,033 | 1934 |
| Van Buren RD over Johnson CR | Fair | 30.8 ft | 1,031 | 1950 |
| Sumas AVE over Johnson CR | Fair | 68.9 ft | 926 | 1970 |
| Baker Lk RD over Rocky CR | Fair | 180.1 ft | 917 | 1956 |
| Baker Lk RD over Sandy CR | Fair | 127.0 ft | 916 | 1957 |
| Jackson RD over Terrell Creek | Fair | 30.8 ft | 897 | 2003 |
| Nulle RD over Friday CR | Fair | 75.1 ft | 851 | 1934 |
| Custer School RD over Dakota CR | Fair | 30.8 ft | 844 | 1950 |
| Custer School RD over Dakota CR Trib | Fair | 30.8 ft | 843 | 1954 |
| Ten Mile RD over Ten Mile CR Trib | Fair | 30.8 ft | 841 | 1900 |
| Ten Mile RD over Ten Mile CR | Fair | 30.8 ft | 841 | 1947 |
| Valley View RD over Haynie CR | Fair | 38.1 ft | 820 | 1956 |
| Delta Line RD over Dakota CR | Fair | 30.8 ft | 808 | 1950 |
| Mosquito Lk RD over North Fork | Fair | 210.0 ft | 800 | 1930 |
| Pangborn RD over Fish Trap CR | Fair | 38.1 ft | 700 | 1954 |
| SR 542 over N Fork Nooksack River | Fair | 178.1 ft | 649 | 1957 |
| SR 542 over Galena Creek | Fair | 107.0 ft | 623 | 1946 |
| Old Samish HWY over Chuckanut Creek | Fair | 21.0 ft | 600 | 1960 |
| W. Front St. over Johnson CR | Fair | 104.0 ft | 575 | 1962 |
| Potter RD over Slough | Fair | 76.1 ft | 575 | 1934 |
| Rock RD over Saar CR | Fair | 30.8 ft | 524 | 1966 |
| Mosquito Lk RD over Canyon CR | Fair | 80.1 ft | 418 | 1937 |
| Mosquito Lk RD over Hutchinson CR | Fair | 30.8 ft | 389 | 1945 |
| Ten Mile RD over Ten Mile CR | Fair | 38.1 ft | 372 | 1934 |
| Valley View RD over California CR | Fair | 30.8 ft | 365 | 1949 |
| Turkington RD over Jones CR | Fair | 30.8 ft | 338 | 1951 |
| Massey RD over Sumas River | Fair | 30.8 ft | 326 | 1950 |
| Stein RD over Dakota CR Trib | Fair | 49.9 ft | 323 | 1906 |
| Alm RD over Sumas River | Fair | 68.9 ft | 291 | 1947 |
| Gillies RD over Sumas River | Fair | 76.1 ft | 280 | 1932 |
| Giles RD over Dakota CR | Fair | 130.9 ft | 275 | 1995 |
| Lindsay RD over Sumas River | Fair | 76.1 ft | 267 | 1956 |
| Gillies RD over Sumas River | Fair | 57.1 ft | 263 | 1947 |
| North Pass RD over Sumas River | Fair | 30.8 ft | 260 | 1949 |
| Saxon RD over Skookum CR | Fair | 103.7 ft | 256 | 1980 |
| Saxon RD over South Fork Nooksack | Fair | 275.9 ft | 256 | 1998 |
| Garrison RD over Sumas River | Fair | 68.9 ft | 252 | 1935 |
| Hillside RD over Sigitowitz Creek | Fair | 30.8 ft | 250 | 1950 |
| Jones RD over Sumas River | Fair | 151.9 ft | 220 | 1917 |
| Jones RD over Saar CR | Fair | 30.8 ft | 206 | 1946 |
| Road over Swift Creek | Fair | 211.0 ft | 203 | 1981 |
| Newhalem Campgroun over Skagit River | Fair | 314.0 ft | 200 | 1958 |
| Assink RD over Fishtrap CR | Fair | 30.8 ft | 195 | 1949 |
| Hillside RD over Falls Creek | Fair | 24.0 ft | 194 | 1969 |
| Arnie RD over California CR | Fair | 30.8 ft | 190 | 2004 |
| Behme RD over Dakota CR | Fair | 30.8 ft | 189 | 1930 |
| Mosquito Lk RD over Porter Creek | Fair | 30.8 ft | 162 | 1936 |
| Jones RD over Sleasman Slough | Fair | 30.8 ft | 150 | 1935 |
| Park Entrance Road over Terrell Creek | Fair | 31.2 ft | 135 | 1963 |
| Flynn RD over Fishtrap CR | Fair | 36.1 ft | 125 | 1988 |
| Mosquito Lk RD over Middle Fork | Fair | 431.1 ft | 117 | 1915 |
| Mack RD over Sumas River | Fair | 30.8 ft | 106 | 1932 |
| Innis Creek RD over Samish River | Fair | 31.2 ft | 106 | 1999 |
| Turkington RD over Mccarty CR | Fair | 72.2 ft | 100 | 1975 |
| Road over N. Fork Nooksack River | Fair | 89.9 ft | 84 | 1957 |
| Road over Sulphur CR | Fair | 51.8 ft | 81 | 1954 |
| Nelson RD over Black Slough | Fair | 30.8 ft | 80 | 1934 |
| Rd. 31. Mp 7.1 over Kidney Creek | Fair | 103.0 ft | 73 | 1953 |
| Bylsma RD over Drainage Ditch | Fair | 30.8 ft | 72 | 1951 |
| Shady LN over Silver Creek | Fair | 30.8 ft | 70 | 1953 |
| Chasteen RD over Ten Mile CR | Fair | 38.1 ft | 68 | 1946 |
| Road over Glacier Creek | Fair | 145.0 ft | 64 | 1966 |
| Cornell Creek RD over Hendricks Creek | Fair | 60.0 ft | 62 | 1967 |
| Putnam RD over Smith CR | Fair | 30.8 ft | 56 | 1958 |
| Road over Clearwater Creek | Fair | 145.7 ft | 50 | 1968 |
| No Data Entered over Beaver Creek Trib. | Fair | 61.4 ft | 50 | 2003 |
| Road over Slate Creek | Fair | 50.5 ft | 50 | 2007 |
| Road over Bagley Creek | Fair | 60.0 ft | 50 | 2007 |
| Road over Morovitz Creek | Fair | 70.5 ft | 50 | 2009 |
| Road over Anderson Creek | Fair | 70.5 ft | 50 | 2007 |
| Lind RD over Smith CR | Fair | 30.8 ft | 50 | 1955 |
| Road over Bar Creek | Fair | 75.1 ft | 42 | 1960 |
| Flannegan RD over Johnson CR | Fair | 30.8 ft | 40 | 1955 |
| Road over Park Creek | Fair | 65.0 ft | 35 | 1955 |
| Road over Rocky CR | Fair | 67.9 ft | 30 | 1959 |
| Road over Warm Creek | Fair | 109.9 ft | 25 | 1968 |
| Coal Creek RD over Gallop Creek | Fair | 65.0 ft | 18 | 1952 |
| Coal Creek RD over Deep CR | Fair | 30.8 ft | 15 | 2000 |
| Road over Wallace Creek | Fair | 96.1 ft | 12 | 2002 |
| Bridge Wy over California CR | Fair | 85.0 ft | 12 | 1922 |
| Robinson Street over Nooksack Slough | Fair | 38.1 ft | 10 | 1960 |
| Lenhart RD over Saar Creek | Fair | 30.8 ft | 8 | 1953 |
| I-5 over Kentucky ST | Good | 129.9 ft | 33,565 | 1958 |
| SR 542 (sunset Dr) over I-5 | Good | 205.1 ft | 31,813 | 1996 |
| I-5 over Transmt. Oil Pipeline | Good | 32.2 ft | 26,177 | 1972 |
| I-5 over Padden Creek | Good | 67.9 ft | 24,069 | 2021 |
| I-5 over Padden Creek | Good | 67.9 ft | 24,069 | 2021 |
| I-5 over Nulle RD | Good | 149.0 ft | 23,887 | 1964 |
| I-5 over Nulle RD | Good | 141.1 ft | 23,887 | 1963 |
| Bakerview RD over I-5 | Good | 215.9 ft | 22,813 | 1975 |
| I-5 over SR 11 (connelly Ave) | Good | 169.0 ft | 22,194 | 1962 |
| Main Street over I-5 | Good | 265.1 ft | 21,793 | 1968 |
| SR 539 over Ten Mile Creek | Good | 60.0 ft | 19,679 | 2008 |
| SR 539 over Four Mile Creek | Good | 60.0 ft | 19,679 | 2008 |
| SR 539 over Nooksack R Overflow | Good | 24.9 ft | 15,862 | 2009 |
| SR 539 over Nooksack R Overflow | Good | 24.9 ft | 15,862 | 2009 |
| Slater RD over Jordan Creek | Good | 142.1 ft | 15,000 | 2017 |
| SR 11 over Padden Creek | Good | 21.0 ft | 14,626 | 2021 |
| SR 11 over Padden Creek | Good | 53.1 ft | 13,763 | 2013 |
| SR 539 over Duffner Ditch | Good | 24.9 ft | 13,480 | 2023 |
| SR 542 over Squalicum Creek | Good | 105.0 ft | 12,774 | 2023 |
| James Street over Squalicum Creek | Good | 89.6 ft | 11,500 | 2015 |
| SR 542 over Nooksack River | Good | 930.1 ft | 11,291 | 1999 |
| SR 542 over Overflow Channel | Good | 60.0 ft | 11,291 | 1999 |
| Hannegan RD over Ten Mile Creek | Good | 64.0 ft | 11,198 | 2018 |
| State ST Ellis ST over Whatcom Creek | Good | 66.9 ft | 10,360 | 2022 |
| SR 544 over Nooksack River | Good | 465.9 ft | 10,205 | 1994 |
| Hannegan RD over Four Mile Creek | Good | 37.1 ft | 9,411 | 1954 |
| SR 542 over Smith Creek | Good | 64.0 ft | 9,227 | 1948 |
| SR 542 over Smith Creek | Good | 64.0 ft | 9,227 | 1948 |
| SR 542 over Mccauley CR | Good | 49.9 ft | 9,227 | 1948 |
| Hannegan RD over Scott Ditch | Good | 77.1 ft | 9,000 | 2009 |
| SR 542 over Mccauley Creek | Good | 49.9 ft | 8,427 | 1948 |
| SR 542 over Anderson Creek | Good | 65.0 ft | 8,272 | 2015 |
| SB SR 539 over Wiser Lake | Good | 60.0 ft | 8,009 | 1947 |
| NB SR 539 over Wiser Lake | Good | 66.9 ft | 8,009 | 2009 |
| NB SR 539 over Nooksack R Overflow | Good | 438.0 ft | 7,931 | 1950 |
| SB SR 539 over Nooksack R Overflow | Good | 435.0 ft | 7,931 | 2009 |
| SR 539 over Nooksack River | Good | 589.9 ft | 7,931 | 2009 |
| SB SR 539 over Nooksack R Overflow | Good | 323.2 ft | 7,931 | 2009 |
| SR 539 over Fishtrap Creek | Good | 102.0 ft | 7,931 | 2008 |
| Kok Road over Fish Trap Creek | Good | 69.9 ft | 6,791 | 2012 |
| Thornton Street over Bnsf Railway | Good | 386.2 ft | 6,561 | 2023 |
| D Street over SR 543 Northbound | Good | 64.0 ft | 6,423 | 2007 |
| D Street over SR 543 Southbound | Good | 52.2 ft | 6,423 | 2007 |
| Squalicum PKWY over Squalicum CR | Good | 34.8 ft | 6,200 | 2020 |
| Depot RD over Fishtrap CR | Good | 37.1 ft | 6,187 | 1992 |
| Main ST over Pepin Creek | Good | 66.9 ft | 6,100 | 2022 |
| Main Street over Fishtrap Creek | Good | 96.1 ft | 6,039 | 2014 |
| Lake Whatcom BLVD over Austin Creek | Good | 82.0 ft | 5,495 | 2004 |
| Bender RD over Fish Trap CR | Good | 37.1 ft | 5,445 | 1992 |
| SR 543 over I-5 | Good | 252.0 ft | 5,422 | 1971 |
| SR 542 over Nooksack Tributary | Good | 22.0 ft | 5,312 | 2010 |
| SR 548 over Terrell Creek | Good | 30.8 ft | 5,174 | 2011 |
| Mitchell AVE over I-5 | Good | 303.1 ft | 5,000 | 1963 |
| Smith RD over I-5 | Good | 369.1 ft | 4,737 | 1972 |
| SR 546 over Johnson Creek | Good | 60.4 ft | 4,714 | 1961 |
| Marine DR over Marietta Slough | Good | 105.0 ft | 4,009 | 1978 |
| Fraser Street over Cemetery Creek | Good | 32.2 ft | 4,000 | 2000 |
| Marine DR over Portage Slough | Good | 89.9 ft | 3,741 | 1997 |
| SR 9 over Overflow Channel | Good | 67.9 ft | 3,728 | 1945 |
| SR 9 over Smith Creek | Good | 82.0 ft | 3,728 | 1946 |
| SR 9 over Black Slough | Good | 36.1 ft | 3,517 | 1952 |
| SR 9 over Black Slough | Good | 87.9 ft | 3,517 | 1900 |
| SR 9 over Tawes Creek | Good | 30.8 ft | 3,517 | 2019 |
| Samish Way over I-5 | Good | 247.0 ft | 3,500 | 2000 |
| SR 542 over High Creek | Good | 27.9 ft | 3,035 | 2016 |
| Portal Way over I-5 | Good | 318.9 ft | 3,000 | 1961 |
| Badger RD W over Bertrand CR | Good | 105.0 ft | 2,988 | 2019 |
| SR 9 over Drainage Channel | Good | 67.9 ft | 2,967 | 1945 |
| SR 9 over S Fk Nooksack River | Good | 379.9 ft | 2,617 | 1987 |
| SR 9 over Lake Whatcom Ry | Good | 27.9 ft | 2,617 | 1989 |
| N 14th Street over Fishtrap Creek | Good | 84.0 ft | 2,592 | 2009 |
| City ST To I-5 NB over I-5 | Good | 399.9 ft | 2,540 | 1976 |
| Aaron Drive over Fishtrap Creek | Good | 36.1 ft | 2,536 | 1999 |
| I-5 over SR 548 (d St) | Good | 158.1 ft | 2,280 | 1963 |
| I-5 over SR 548 (d St) | Good | 163.1 ft | 2,280 | 1963 |
| NB I-5 over Inspection Lanes/bldgs | Good | 321.9 ft | 2,280 | 2009 |
| I-5 over N-w Ramp I-5 | Good | 245.1 ft | 2,244 | 1962 |
| 17th Ave. over Double Ditch Creek | Good | 65.0 ft | 2,142 | 2009 |
| H ST over I-5 | Good | 284.4 ft | 1,984 | 1962 |
| SR 542 over Boulder CR | Good | 148.0 ft | 1,951 | 2007 |
| SR 542 over Hedrick Creek | Good | 126.6 ft | 1,951 | 2017 |
| SR 20 over Thornton Creek | Good | 100.1 ft | 1,930 | 1980 |
| SR 542 over Gallup Creek | Good | 115.2 ft | 1,916 | 2010 |
| SR 547 over Sumas River | Good | 126.0 ft | 1,915 | 1952 |
| Hughes AVE over I-5 | Good | 288.1 ft | 1,883 | 1963 |
| Ferndale RD over Slough | Good | 89.9 ft | 1,643 | 1979 |
| Rathbone RD over Bertrand Creek | Good | 82.0 ft | 1,522 | 1950 |
| Loomis Trail RD over I-5 | Good | 237.9 ft | 1,500 | 1963 |
| Loomis Trail RD over South Fork Dakota CR | Good | 28.9 ft | 1,500 | 1950 |
| SR 20 over Skagit R | Good | 460.0 ft | 1,470 | 1960 |
| SR 20 over Colonial Creek | Good | 115.2 ft | 1,322 | 1961 |
| SR 20 over Horsetail Creek | Good | 362.9 ft | 1,322 | 1968 |
| SR 542 over N Fork Nooksack River | Good | 194.9 ft | 1,283 | 1963 |
| SR 542 over Coal Creek | Good | 110.9 ft | 1,283 | 1971 |
| SR 542 over Slide Area | Good | 149.9 ft | 1,283 | 1994 |
| Custer School RD over I-5 Ramp | Good | 270.0 ft | 1,166 | 1962 |
| Sunrise RD over Dakota CR | Good | 53.1 ft | 1,149 | 2005 |
| Sunrise RD over S Fork Dakota CR | Good | 53.1 ft | 1,149 | 2005 |
| Northshore RD over Smith Creek | Good | 99.1 ft | 1,010 | 1989 |
| Laurel RD W over Ten Mile CR | Good | 61.0 ft | 961 | 1933 |
| Kickerville RD over California CR | Good | 169.0 ft | 951 | 1956 |
| Baker Lk RD over Sulphur CR | Good | 111.9 ft | 916 | 2010 |
| Old Guide RD over Ten Mile CR | Good | 30.8 ft | 887 | 1933 |
| South Pass RD over Saar Creek | Good | 53.1 ft | 867 | 2016 |
| SR 20 over Sidehill | Good | 82.0 ft | 848 | 1962 |
| Mosquito Lk RD over Hutchinson CR | Good | 71.9 ft | 818 | 2005 |
| Garrison RD over Johnson CR | Good | 46.9 ft | 798 | 1945 |
| Stein RD over Dakota Creek | Good | 55.1 ft | 720 | 2000 |
| Noon RD over Ten Mile Creek | Good | 40.0 ft | 645 | 2012 |
| Bruce RD over California CR | Good | 40.0 ft | 643 | 1923 |
| SR 542 over Galena Creek | Good | 28.9 ft | 636 | 1945 |
| SR 542 over Razorhone Creek | Good | 44.9 ft | 636 | 1946 |
| SR 542 over Razorhone Creek | Good | 24.9 ft | 623 | 1945 |
| Loomis Trail RD over Dakota CR | Good | 40.0 ft | 604 | 2006 |
| Brentwood DR over Nooksack Slough | Good | 60.0 ft | 600 | 2023 |
| Potter RD over South Fork Nooksack | Good | 359.9 ft | 557 | 2015 |
| South Bay DR over Brannian Creek | Good | 40.0 ft | 542 | 2008 |
| Valencia Street over Whatcom Creek | Good | 75.1 ft | 500 | 2000 |
| Kelly RD over Anderson CR | Good | 30.8 ft | 450 | 1939 |
| Hemmi RD W over Ten Mile CR | Good | 80.1 ft | 441 | 1986 |
| Road over Little Sandy Creek | Good | 81.4 ft | 382 | 1964 |
| Road over Boulder Creek | Good | 296.9 ft | 382 | 1993 |
| Road over Park Creek | Good | 103.0 ft | 382 | 1981 |
| Mosquito Lk RD over Johnson CR | Good | 24.0 ft | 337 | 2004 |
| Northwood RD over Fish Trap CR | Good | 30.8 ft | 300 | 1950 |
| Hillaire RD over Red River | Good | 84.6 ft | 284 | 1997 |
| Lindsay RD over Sumas River | Good | 75.1 ft | 267 | 1997 |
| Lindsay RD over Sumas River | Good | 62.0 ft | 263 | 1993 |
| Clearbrook RD over Johnson Creek | Good | 53.1 ft | 240 | 2010 |
| Oat Coles RD over Swift CR | Good | 30.8 ft | 223 | 2017 |
| Wickersham RD over Np Rr | Good | 126.0 ft | 159 | 1955 |
| Wickersham RD over Samish River | Good | 68.9 ft | 159 | 1998 |
| Baker Lake Road over Shannon Creek | Good | 102.7 ft | 150 | 2004 |
| Roberts RD over Anderson CR | Good | 83.0 ft | 150 | 2019 |
| River RD over Fish Trap Creek | Good | 49.9 ft | 140 | 2004 |
| Frost RD over Saar Creek | Good | 104.0 ft | 118 | 2004 |
| Innis Creek RD over Innis Creek | Good | 40.0 ft | 110 | 2007 |
| 33rd Street over Padden Creek | Good | 50.9 ft | 100 | 2022 |
| Road over Swamp Creek | Good | 60.0 ft | 80 | 1984 |
| Road #31 over Canyon Creek | Good | 103.0 ft | 50 | 1996 |
| No Data Entered over Beaver Creek Trib. | Good | 41.3 ft | 50 | 2003 |
| No Data Entered over Beaver Creek Trib. | Good | 51.2 ft | 50 | 2003 |
| No Data Entered over Beaver Creek | Good | 92.8 ft | 50 | 2010 |
| Road over Rankin Creek | Good | 70.5 ft | 50 | 2006 |
| No Data Entered over Canyon Creek | Good | 70.5 ft | 50 | 2007 |
| No Data Entered over Anderson Creek | Good | 69.9 ft | 50 | 2014 |
| Road over Sulphur CR | Good | 69.9 ft | 30 | 1954 |
| Canyon Creek #31 over No Name Creek | Good | 100.1 ft | 20 | 1996 |
| Road #39 over Falls Creek | Good | 61.0 ft | 20 | 1996 |
| Road #39 over Grouse Creek | Good | 56.1 ft | 20 | 1996 |
| 19th ST over Chuckanut Creek | Good | 40.0 ft | 20 | 2021 |
| Road over Thompson Creek | Good | 51.8 ft | 15 | 1985 |
| Road # 3160 over Canyon Creek | Good | 95.1 ft | 10 | 1985 |
| Heron LN over Johnson CR | Good | 71.9 ft | 10 | 1944 |
| Nooksack RD over Johnson CR | Good | 53.1 ft | 10 | 1996 |
| Alaska Ferry over Belligham Bay | Good | 149.0 ft | 10 | 1989 |
| Road over Thompson Creek | Good | 51.8 ft | 2 | 2003 |