| IRR BIA RTE 2 over Dawson Creek | Poor | 32.2 ft | 100 | 1932 |
| IRR BIA RTE 13 over South Fork Milk River | Poor | 102.0 ft | 60 | 1979 |
| IRR BIA RTE 191 over Two Medicine Creek | Poor | 174.9 ft | 50 | 1969 |
| IRR - US 2 over Cut Bank Creek | Fair | 441.6 ft | 3,523 | 2007 |
| IRR - US 89 over ST Marys River | Fair | 313.0 ft | 2,355 | 1956 |
| Going-to-the-sun R over St. Mary River | Fair | 140.1 ft | 2,300 | 1934 |
| Going-to-the-sun R over Divide Creek | Fair | 52.2 ft | 2,300 | 1934 |
| US 2 over Two Medicine IRR Canal | Fair | 49.9 ft | 2,130 | 1942 |
| IRR - US 2 over Willow Creek | Fair | 39.0 ft | 2,128 | 1957 |
| IRR - US 2 over Flatiron Creek | Fair | 39.0 ft | 2,128 | 1957 |
| IRR - S 49 over Two Medicine River 001 | Fair | 144.0 ft | 2,059 | 1966 |
| Rising Sun Campgro over Roes Creek | Fair | 36.7 ft | 1,942 | 1965 |
| Going-to-the-sun R over Baring Creek | Fair | 71.9 ft | 1,942 | 1932 |
| IRR - US 2 over Two Medicine River | Fair | 1521.0 ft | 1,939 | 2012 |
| IRR - US 2 over Midvale Creek | Fair | 139.4 ft | 1,928 | 2001 |
| IRR - US 89 over Two Medicine Canal | Fair | 50.9 ft | 1,475 | 1950 |
| IRR - US 89 over Agency Creek | Fair | 70.9 ft | 1,266 | 1966 |
| IRR - US 89 over Badger Creek | Fair | 307.7 ft | 1,266 | 1966 |
| US 89 over Two Medicine River | Fair | 268.0 ft | 1,266 | 1950 |
| IRR BIA RTE 10 over Willow Creek | Fair | 30.8 ft | 1,120 | 2000 |
| IRR BIA RTE 10 over Willow Creek | Fair | 30.8 ft | 1,120 | 2000 |
| Duck Lake RD over Cut Bank Creek | Fair | 174.9 ft | 1,046 | 1965 |
| IRR BIA RTE 1 over Two Medicine River | Fair | 357.9 ft | 1,000 | 1967 |
| IRR BIA RTE 1 over Little Badger Creek | Fair | 46.9 ft | 1,000 | 1972 |
| IRR BIA RTE 1 over Badger Creek | Fair | 200.5 ft | 1,000 | 1967 |
| Duck Lake RD over Dry Fork Milk River | Fair | 92.8 ft | 866 | 1977 |
| IRR BIA RTE 4 over Whitetail Creek | Fair | 47.2 ft | 500 | 1972 |
| IRR BIA RTE 8 over Cut Bank Creek | Fair | 165.0 ft | 500 | 1965 |
| Many Glacier Road over Apikuni Creek | Fair | 37.7 ft | 452 | 1931 |
| IRR BIA RTE 130 over St. Mary River | Fair | 182.4 ft | 300 | 1964 |
| IRR BIA RTE 130 over Swift Current Creek | Fair | 169.9 ft | 300 | 1966 |
| Chief Mountain Int over Lee Creek | Fair | 209.6 ft | 246 | 1935 |
| Two Medicine Road over Two Medicine River | Fair | 105.0 ft | 183 | 1950 |
| Two Medicine Road over Appistoki Creek | Fair | 37.4 ft | 183 | 1929 |
| S 213 over S Fork Milk River | Fair | 150.9 ft | 129 | 1973 |
| Sullivan Bridge RD over Marias River 030 | Fair | 283.1 ft | 100 | 1968 |
| Gunsight RD over Two Medicine Canal 01 | Fair | 23.0 ft | 100 | 1989 |
| IRR BIA RTE 2 over S Frk Two Medicine River | Fair | 169.6 ft | 75 | 1962 |
| IRR RTE BIA 55 over Willow Creek Tributary | Fair | 60.0 ft | 70 | 2005 |
| Nps Service Road over Upper Divide Creek | Fair | 100.1 ft | 50 | 1970 |
| IRR BIA RTE 25 over Badger Creek | Fair | 135.2 ft | 30 | 1979 |
| IRR BIA RTE 25 over Badger Creek | Fair | 117.5 ft | 20 | 2002 |
| IRR BIA RTE 57 over Two Medicine Main Canal | Fair | 61.4 ft | 10 | 1990 |
| IRR - US 2 over Rr | Good | 200.1 ft | 3,716 | 1997 |
| IRR - US 2 over Rr | Good | 155.8 ft | 2,515 | 1997 |
| Going-to-the-sun R over Rose Creek | Good | 42.0 ft | 1,942 | 2013 |
| IRR - US 89 over South Fork Milk River | Good | 73.2 ft | 1,718 | 2022 |
| IRR - US 89 over N Fork Cut Bank Creek | Good | 142.1 ft | 1,718 | 1987 |
| S 213 over Rr | Good | 474.7 ft | 1,321 | 2012 |
| IRR - US 89 over S Fork Cut Bank Creek | Good | 82.7 ft | 1,148 | 2018 |
| IRR - US 89 over Lake Creek | Good | 77.8 ft | 1,148 | 2018 |
| Emigrant Gap RD over ST Mary Canal 046 | Good | 82.0 ft | 966 | 1991 |
| Duck Lake RD over South Fork Milk River | Good | 70.9 ft | 821 | 1987 |
| IRR - US 89 over Kennedy Creek | Good | 144.0 ft | 510 | 1976 |
| IRR BIA RTE 4 over Four Horns Canal | Good | 47.6 ft | 500 | 1972 |
| Many Glacier Road over Swift Current Creek | Good | 85.0 ft | 300 | 2014 |
| IRR - S 358 over Spring Creek | Good | 94.2 ft | 267 | 1968 |
| Meriwether RD over Willow Creek | Good | 91.5 ft | 213 | 2002 |
| Meriwether RD over Cut Bank Creek | Good | 242.1 ft | 213 | 2002 |
| Meriwether RD over Cobelle Coulee | Good | 38.1 ft | 213 | 1959 |
| IRR - S 213 over Rocky Coulee | Good | 136.5 ft | 160 | 2011 |
| Pardue RD over Cutbank Creek 035 | Good | 87.9 ft | 102 | 2017 |
| Welch RD over Two Medicine Canal 016 | Good | 47.9 ft | 100 | 1960 |
| Camp Nine RD over ST Mary River 054 | Good | 218.2 ft | 100 | 2008 |
| Irrcounty Road 227 over ST Mary Canal 058 | Good | 61.0 ft | 100 | 1986 |
| Galbreath RD over ST Mary Canal 045 | Good | 82.0 ft | 100 | 1991 |
| Reagan RD over Rocky Coulee 039 | Good | 24.0 ft | 100 | 2004 |
| IRR BIA RTE 191 over Forty Mile Creek | Good | 24.0 ft | 75 | 1990 |
| IRR BIA RTE 13 over Cut Bank Creek | Good | 111.9 ft | 60 | 1966 |
| IRR BIA RTE 13 over Greasewood Creek | Good | 77.4 ft | 60 | 1984 |
| IRR BIA RTE 13 over ST Mary Canal | Good | 83.0 ft | 10 | 2002 |