Slab bridges in Montana
A solid, flat concrete slab that acts as both the supporting structure and the roadway surface. Common for short crossings. Montana has 367 of them, 7.0% of its bridges. Nationally this type accounts for 13.2% of all bridges.Compare states for this type.
- Slab bridges
- 367
- Poor condition
- 2%
- 9 bridges
- Average age
- 42.3 yrs
- Combined length
- 4 mi
Busiest slab bridges in Montana
Top 200 by daily traffic| Bridge | County | Location | Built | Type | Length | Daily traffic | Condition |
|---|---|---|---|---|---|---|---|
| Grand Ave over Bbwa Canal No. U01004001+08401 | Yellowstone County | Billings-Grand Ave | 1981 | Slab | 51 ft | 15,881 | Fair |
| S Montana ST over Silver Bow Creek No. U01805000+05711 | Silver Bow County | Butte-S Montana ST | 1970 | Slab | 31 ft | 14,718 | Fair |
| I 90 over Rattler Gulch No. I00090149+03001 | Granite County | 4.1M W Drummond | 1971 | Slab | 21 ft | 13,081 | Fair |
| I 90 over Lost Creek No. I00090198+09371 | Deer Lodge County | 2.5M N Warm Springs | 1978 | Slab | 27 ft | 11,628 | Fair |
| N Montana Ave over Helena Valley Canal No. U05809002+02701 | Lewis and Clark County | 1M N Helena | 1958 | Slab | 25 ft | 11,167 | Fair |
| I 90 over Int Exit 396 No. I00090396+09921 | Stillwater County | 5M E Reedpoint | 1963 | Slab | 22 ft | 10,845 | Fair |
| Canyon Ferry RD over Prickly Pear Creek No. S00430000+09131 | Lewis and Clark County | 1M E Helena | 2001 | Slab | 78 ft | 10,503 | Good |
| I 90 over Jr Grade Sep No. I00090180+04301 | Powell County | 6.2M N Deer Lodge | 1961 | Slab | 23 ft | 10,463 | Fair |
| I 90 over Jr Grade Sep No. I00090182+09191 | Powell County | 6.2M N Deer Lodge | 1961 | Slab | 23 ft | 10,463 | Fair |
| I 90 over Willow Creek No. I00090205+04371 | Deer Lodge County | 2.5M N Opportunity | 1978 | Slab | 28 ft | 10,417 | Fair |
| I 90 over Sep Fort Ellis Road No. I00090310+09781 | Gallatin County | 1.2M E Bozeman | 1971 | Slab | 79 ft | 9,819 | Fair |
| I 90 over Sep Fort Ellis Road No. I00090310+09782 | Gallatin County | 1.2M E Bozeman | 1971 | Slab | 79 ft | 9,819 | Fair |
| Springhill RD over East Gallatin River No. S00411000+04681 | Gallatin County | 3M NW Bozeman | 1990 | Slab | 80 ft | 9,107 | Fair |
| Springhill RD over Churn Creek No. S00411001+02281 | Gallatin County | 4M NW Bozeman | 1990 | Slab | 31 ft | 9,107 | Fair |
| US 2 over Flower Creek No. P00001032+00381 | Lincoln County | Libby | 1970 | Slab | 26 ft | 8,882 | Good |
| P 86-BRIDGER DR over East Gallatin River No. P00086001+04821 | Gallatin County | 1M N Bozeman | 1984 | Slab | 78 ft | 8,443 | Fair |
| P 86-BRIDGER DR over Bridger Creek No. P00086003+01311 | Gallatin County | 2M NE Bozeman | 2005 | Slab | 85 ft | 8,443 | Fair |
| I 90 over Orea Creek Road No. I00090328+00291 | Park County | 5M W Livingston | 1977 | Slab | 78 ft | 8,236 | Fair |
| I 90 over Orea Creek Road No. I00090328+00292 | Park County | 5M W Livingston | 1977 | Slab | 78 ft | 8,236 | Fair |
| Expressway RD over Grant Creek 003 No. M32081000+00301 | Missoula County | Missoula-Expressway RD | 1981 | Slab | 44 ft | 7,844 | Fair |
| I 90 over Pine Crest Road No. I00090417+07421 | Stillwater County | 8.7M E Columbus | 1970 | Slab | 79 ft | 6,161 | Fair |
| I 90 over Pine Crest Road No. I00090417+07422 | Stillwater County | 8.7M E Columbus | 1970 | Slab | 79 ft | 6,161 | Fair |
| I 90 over Ronan Ranch Road No. I00090419+00261 | Stillwater County | 7.4M W Park City | 1970 | Slab | 79 ft | 6,161 | Fair |
| I 90 over Ronan Ranch Road No. I00090419+00262 | Stillwater County | 7.4M W Park City | 1970 | Slab | 79 ft | 6,161 | Fair |
| I 90 over Sep Yegens County Road No. I00090419+09851 | Stillwater County | 6.2M W Park City | 1970 | Slab | 79 ft | 6,161 | Fair |
| I 90 over Sep Yegens County Road No. I00090419+09852 | Stillwater County | 6.2M W Park City | 1970 | Slab | 79 ft | 6,161 | Fair |
| I 90 over Cnty RD 113-FRYER Creek No. I00090358+04801 | Sweet Grass County | 4.3M E Springdale | 1983 | Slab | 78 ft | 6,090 | Good |
| I 90 over Cnty RD 113-FRYER Creek No. I00090358+04802 | Sweet Grass County | 4.3M E Springdale | 1983 | Slab | 78 ft | 6,090 | Fair |
| I 90 over Sep County Road No. I00090363+05671 | Sweet Grass County | 5M W Big Timber | 1981 | Slab | 79 ft | 6,090 | Fair |
| I 90 over Sep County Road No. I00090363+05672 | Sweet Grass County | 5M W Big Timber | 1981 | Slab | 79 ft | 6,090 | Fair |
| I 90 over Sep Loiselle Road No. I00090093+03971 | Missoula County | 3.7M E Frenchtown | 1971 | Slab | 79 ft | 6,073 | Fair |
| I 90 over Sep Loiselle Road No. I00090093+03972 | Missoula County | 3.7M E Frenchtown | 1971 | Slab | 79 ft | 6,073 | Fair |
| I 15 over Prickly Pear Creek No. I00015180+08901 | Jefferson County | 1.2M S Clancy | 1969 | Slab | 23 ft | 5,987 | Fair |
| I 15 over Prickly Pear Creek No. I00015181+05641 | Jefferson County | 0.6M S Clancy | 1969 | Slab | 23 ft | 5,987 | Fair |
| US 2 over Cherry Creek Overflow No. P00001539+09441 | Valley County | 1M N Glasgow | 1980 | Slab | 115 ft | 5,857 | Fair |
| US 2 over Cherry Creek No. P00001540+03401 | Valley County | 1M N Glasgow | 1979 | Slab | 115 ft | 5,857 | Fair |
| I 90 over Sep Perkins Lane No. I00090199+06471 | Deer Lodge County | 1.9M N Warm Springs | 1978 | Slab | 78 ft | 5,814 | Fair |
| I 90 over Sep Huffman Lane No. I00090199+06472 | Deer Lodge County | 1.9M N Warm Springs | 1978 | Slab | 78 ft | 5,814 | Fair |
| I 90 over Sep County Road No. I00090345+07861 | Park County | 8.7M W Springdale | 1987 | Slab | 62 ft | 5,766 | Fair |
| I 90 over Sep County RD Peerson RD No. I00090345+07862 | Park County | 8.7M W Springdale | 1987 | Slab | 62 ft | 5,766 | Fair |
| I 90 over Peterson Creek No. I00090349+01321 | Park County | 5M W Springdale | 1987 | Slab | 45 ft | 5,766 | Good |
| I-90 over Peterson Creek No. I00090349+01322 | Park County | 5M W Springdale | 2012 | Slab | 60 ft | 5,766 | Fair |
| I 90 over Int Springdale West No. I00090350+04551 | Park County | 3.7M W Springdale | 1987 | Slab | 79 ft | 5,766 | Fair |
| I 90 over Int Springdale West No. I00090350+04552 | Park County | 3.7M W Springdale | 1987 | Slab | 79 ft | 5,766 | Fair |
| I 90 over Sep County Road No. I00090264+00611 | Jefferson County | 7.4M E Cardwell | 1969 | Slab | 79 ft | 5,599 | Fair |
| I 90 over Sep County Road No. I00090264+00612 | Jefferson County | 7.4M E Cardwell | 1969 | Slab | 79 ft | 5,599 | Fair |
| I 90 over Sep Houle Creek Road No. I00090086+06411 | Missoula County | 3.1M W Frenchtown | 1971 | Slab | 79 ft | 5,499 | Fair |
| I 90 over Sep Houle Creek Road No. I00090086+06412 | Missoula County | 3.1M W Frenchtown | 1971 | Slab | 79 ft | 5,499 | Fair |
| I 90 over Greycliff Creek RD No. I00090381+05801 | Sweet Grass County | 3.7M E Greycliff | 1972 | Slab | 78 ft | 5,423 | Fair |
| I 90 over Greycliff Creek RD No. I00090381+05802 | Sweet Grass County | 3.7M E Greycliff | 1972 | Slab | 78 ft | 5,423 | Fair |
| I 90 over Sep Sager Lane No. I00090191+08641 | Powell County | 5M S Deer Lodge | 1975 | Slab | 79 ft | 5,354 | Good |
| I 90 over Sep Sager Lane No. I00090191+08642 | Powell County | 5M S Deer Lodge | 1975 | Slab | 79 ft | 5,354 | Good |
| US 191-1st Ave N over Big Spring Creek No. P00043000+00851 | Fergus County | LEWISTOWN-1st Ave N | 1960 | Slab | 34 ft | 5,189 | Fair |
| I 90 over Sep Garrison Frontage RD No. I00090171+07791 | Powell County | 2.5M W Garrison | 1973 | Slab | 78 ft | 5,136 | Fair |
| I 90 over Sep Garrison Frontage RD No. I00090171+07792 | Powell County | 2.5M W Garrison | 1973 | Slab | 78 ft | 5,136 | Fair |
| Green Meadow DR over Ten Mile Creek No. S00231001+00001 | Lewis and Clark County | 1M N Helena | 1992 | Slab | 79 ft | 4,837 | Good |
| S 1 over Warm Springs Creek No. P00019010+03321 | Deer Lodge County | 1M W Anaconda | 1990 | Slab | 67 ft | 4,752 | Fair |
| Green Meadow DR over Helena Valley Canal No. S00231002+01001 | Lewis and Clark County | 2M N Helena | 1992 | Slab | 62 ft | 4,510 | Good |
| US 287 over Madison River Overflow No. P00013048+02901 | Madison County | SE Ennis | 2001 | Slab | 93 ft | 4,500 | Good |
| US 287 over Madison River Overflow No. P00013048+03761 | Madison County | SE Ennis | 2001 | Slab | 67 ft | 4,500 | Good |
| S 200 over First Hay Creek No. P00020059+05101 | Richland County | 3M SW Fairview | 1986 | Slab | 110 ft | 4,499 | Fair |
| Wylie DR over Prickly Pear Creek 080 No. L25007003+03001 | Lewis and Clark County | 1M N East Helena | 1958 | Slab | 33 ft | 4,338 | Good |
| S 16-S Central Ave over Lone Tree Creek No. P00020051+06421 | Richland County | Sidney-S Central Ave | 1974 | Slab | 90 ft | 3,968 | Fair |
| I 90 over Sep County Road No. I00090474+01891 | Big Horn County | 21.1M E Billings | 1972 | Slab | 79 ft | 3,946 | Fair |
| I 90 over Sep County Road No. I00090474+01892 | Big Horn County | 21.1M E Billings | 1972 | Slab | 79 ft | 3,946 | Fair |
| I 90 over Sep Indian CR Frontage R No. I00090465+07401 | Yellowstone County | 13M E Billings | 1972 | Slab | 79 ft | 3,946 | Fair |
| I 90 over Sep Indian CR Frontage R No. I00090465+07402 | Yellowstone County | 13M E Billings | 1972 | Slab | 79 ft | 3,946 | Fair |
| Virginia LN over Bbwa Canal No. U01015001+07301 | Yellowstone County | Billings-Virginia LN | 1988 | Slab | 37 ft | 3,881 | Good |
| I 15 over Sep Galena Gulch Road No. I00015161+01511 | Jefferson County | 4.3M E Basin | 1981 | Slab | 78 ft | 3,856 | Fair |
| I 15 over Sep Lump Gulch Road No. I00015182+07381 | Jefferson County | 0.6M N Clancy | 1969 | Slab | 80 ft | 3,787 | Fair |
| I 15 over Sep Lump Gulch Road No. I00015182+07382 | Jefferson County | 0.6M N Clancy | 1969 | Slab | 78 ft | 3,787 | Fair |
| I 90 EB over Sep Red Hill Road No. I00090034+02081 | Mineral County | 0.6M E St. Regis | 1978 | Slab | 78 ft | 3,559 | Fair |
| I 90 WB over Sep Red Hill Road No. I00090034+02082 | Mineral County | 0.6M E St. Regis | 1978 | Slab | 78 ft | 3,559 | Fair |
| I 90 EB over Sep Southside Road No. I00090039+09911 | Mineral County | 6.2M E St. Regis | 1984 | Slab | 78 ft | 3,559 | Fair |
| I 90 WB over Sep Southside Road No. I00090039+09912 | Mineral County | 6.2M E St. Regis | 1984 | Slab | 78 ft | 3,559 | Fair |
| US 2 over Main Irrigation Canal No. P00001425+06901 | Blaine County | Harlem | 1968 | Slab | 25 ft | 3,311 | Good |
| US 2 over Parmenter Creek No. P00001031+01281 | Lincoln County | 1M NW Libby | 1970 | Slab | 26 ft | 3,226 | Good |
| I 15 over Sep County Road No. I00015274+02691 | Cascade County | 3M N Ulm | 1969 | Slab | 79 ft | 3,145 | Good |
| I 15 over Sep County Road No. I00015274+02692 | Cascade County | 3M N Ulm | 1969 | Slab | 79 ft | 3,145 | Good |
| US 191 FH 45 over Cougar Creek No. P00050007+05621 | Gallatin County | 7M N West Yellowstone | 1964 | Slab | 37 ft | 3,139 | Fair |
| 14th ST SE over Lone Tree Creek No. U10402000+02061 | Richland County | S Edge SIDNEY-14th ST SE | 1973 | Slab | 90 ft | 3,099 | Fair |
| I 94 over Int Powder River No. I00094169+01012 | Prairie County | 7M SW Terry | 1971 | Slab | 78 ft | 3,045 | Fair |
| I 94 over S 8th RD No. I00094010+01951 | Yellowstone County | 3.7M E Huntley | 1967 | Slab | 79 ft | 3,045 | Fair |
| I 94 over S 8th RD No. I00094010+01952 | Yellowstone County | 3.7M E Huntley | 1967 | Slab | 79 ft | 3,045 | Fair |
| I 15 over Sep Local Road No. I00015060+09941 | Beaverhead County | 2.5M S Dillon | 1983 | Slab | 63 ft | 2,863 | Fair |
| I 15 over Sep Local Road No. I00015060+09942 | Beaverhead County | 2.5M S Dillon | 1983 | Slab | 63 ft | 2,863 | Fair |
| US 2 over Red Rock West Overflow No. 000000202005066 | Blaine County | 2M W Chinook | 2020 | Slab | 55 ft | 2,732 | Good |
| US 2 over Red Rock Coulee No. 000000202005067 | Blaine County | 1M W Chinook | 2020 | Slab | 96 ft | 2,732 | Good |
| US 2 over Red Rock East Overflow No. 000000202005068 | Blaine County | 1M W Chinook | 2020 | Slab | 63 ft | 2,732 | Good |
| I 94 over Sep Wright LN No. I00094108+02111 | Rosebud County | 14M E Forsyth | 1970 | Slab | 78 ft | 2,636 | Fair |
| I 15 over Sep Amazon RD No. I00015167+07041 | Jefferson County | 3.7M N Boulder | 1973 | Slab | 79 ft | 2,534 | Fair |
| I 15 over Sep Amazon Road No. I00015167+07042 | Jefferson County | 3.7M N Boulder | 1973 | Slab | 79 ft | 2,534 | Fair |
| I 15 over Sep Troy Creek Road No. I00015172+03861 | Jefferson County | 3.7M S Jefferson City | 1973 | Slab | 78 ft | 2,534 | Fair |
| I 15 over Sep Troy Creek Road No. I00015172+03862 | Jefferson County | 3.7M S Jefferson City | 1973 | Slab | 78 ft | 2,534 | Fair |
| W Brassey ST over Big Spring Creek No. U07108000+01501 | Fergus County | Lewistown-W Brassey ST | 1920 | Slab | 26 ft | 2,412 | Fair |
| US 2 over Clear Creek No. 000000202005062 | Blaine County | 8M W Chinook | 2020 | Slab | 96 ft | 2,346 | Good |
| Going-To-The-Sun R over St. Mary River No. 1430027P0000000 | Glacier County | 0.8 Mi. NW of Jct. Hwy. 8 | 1934 | Slab | 140 ft | 2,300 | Fair |
| Going-To-The-Sun R over Divide Creek No. 1430028P0000000 | Glacier County | 0.2 Miles Northwest of U. | 1934 | Slab | 52 ft | 2,300 | Fair |
| US 87 over Wolf Creek No. P00057034+09231 | Judith Basin County | 1M W Stanford | 1993 | Slab | 60 ft | 2,300 | Good |
| I 94 over Fly Creek No. I00094025+05971 | Yellowstone County | 2.5M E Pompeys Pillar | 1976 | Slab | 109 ft | 2,255 | Fair |
| I 94 over Fly Creek No. I00094025+05972 | Yellowstone County | 2.5M E Pompeys Pillar | 1976 | Slab | 109 ft | 2,255 | Fair |
| I 94 over Sian Hill Road No. I00094029+02431 | Yellowstone County | 6.2M E Pompeys Pillar | 1976 | Slab | 79 ft | 2,255 | Fair |
| I 94 over Sian Hill Road No. I00094029+02432 | Yellowstone County | 6.2M E Pompeys Pillar | 1976 | Slab | 79 ft | 2,255 | Fair |
| I 94 over S 44th RD No. I00094029+07771 | Yellowstone County | 6.8M E Pompeys Pillar | 1976 | Slab | 61 ft | 2,255 | Fair |
| I 94 over S 44th RD No. I00094029+07772 | Yellowstone County | 6.8M E Pompeys Pillar | 1976 | Slab | 61 ft | 2,255 | Fair |
| I 94 over Bull Mountain RD No. I00094030+07921 | Yellowstone County | 8M E Pompeys Pillar | 1976 | Slab | 61 ft | 2,255 | Fair |
| I 94 over Bull Mountain RD No. I00094030+07922 | Yellowstone County | 8M E Pompeys Pillar | 1976 | Slab | 61 ft | 2,255 | Fair |
| I 94 over Spring Creek Road No. I00094034+02451 | Yellowstone County | 11.2M E Pompeys Pillar | 1973 | Slab | 61 ft | 2,255 | Fair |
| I 94 over Spring Creek Road No. I00094034+02452 | Yellowstone County | 11.2M E Pompeys Pillar | 1973 | Slab | 61 ft | 2,255 | Fair |
| I 94 over Sep Access Rd-Drainage No. I00094157+04301 | Custer County | 19M NE Miles City | 1971 | Slab | 60 ft | 2,232 | Fair |
| I 94 over Sep Access Rd-Drainage No. I00094157+04302 | Custer County | 19M NE Miles City | 1971 | Slab | 60 ft | 2,232 | Fair |
| Bozeman Trail RD over Bear Creek No. 000000202108024 | Gallatin County | 2M SE Bozeman | 2019 | Slab | 25 ft | 2,211 | Good |
| IRR - I 90 over Int Aberdeen No. I00090549+08821 | Big Horn County | Aberdeen | 1985 | Slab | 78 ft | 2,193 | Fair |
| IRR - I 90 over Int Aberdeen No. I00090549+08822 | Big Horn County | Aberdeen | 1985 | Slab | 79 ft | 2,193 | Fair |
| Blue Mountain Road over O`brien Creek 114 No. L32116002+08001 | Missoula County | W of Missoula | 1998 | Slab | 25 ft | 2,192 | Good |
| I 94 over Sep County Road No. I00094233+05261 | Dawson County | 18M SE Glendive | 1977 | Slab | 78 ft | 2,188 | Fair |
| I 94 over Sep County Road No. I00094233+05262 | Dawson County | 18M SE Glendive | 1977 | Slab | 78 ft | 2,188 | Fair |
| I 15 over Sep High Bridge RD No. I00015048+07471 | Beaverhead County | 3.7M N Clark Canyon Dam | 1986 | Slab | 80 ft | 2,185 | Fair |
| I 15 over Sep High Bridge RD No. I00015048+07472 | Beaverhead County | 3.7M N Clark Canyon Dam | 1986 | Slab | 80 ft | 2,185 | Fair |
| I 15 over Sep High Bridge RD No. I00015051+00471 | Beaverhead County | 6.2M N Clark Canyon Dam | 1988 | Slab | 79 ft | 2,185 | Fair |
| I 15 over Sep High Brdge RD No. I00015051+00472 | Beaverhead County | 6.2M N Clark Canyon Dam | 1988 | Slab | 79 ft | 2,185 | Fair |
| S 200 over Wildlife Crossing No. 000000000007021 | Sanders County | 6 Miles East of Thompson | 2019 | Slab | 50 ft | 2,177 | Good |
| IRR - S 200 over Seepay Creek No. P00006092+01681 | Sanders County | 2M SW Perma | 1969 | Slab | 31 ft | 2,167 | Fair |
| I 94 EB over County Road 119 No. I00094195+01421 | Dawson County | 15M SW Glendive | 1973 | Slab | 60 ft | 2,159 | Fair |
| I 94 WB over County Road 119 No. I00094195+01422 | Dawson County | 15M SW Glendive | 1973 | Slab | 60 ft | 2,159 | Fair |
| I 94 over Sep Access Road No. I00094161+01051 | Custer County | 23M NE Miles City | 1971 | Slab | 79 ft | 2,137 | Fair |
| I 94 over Sep Access Road No. I00094161+01052 | Custer County | 23M NE Miles City | 1971 | Slab | 79 ft | 2,137 | Fair |
| I 94 over Sep Montana Road No. I00094165+01051 | Prairie County | 11M SW Terry | 1971 | Slab | 78 ft | 2,137 | Fair |
| I 94 over Sep Montana Road No. I00094165+01052 | Prairie County | 11M SW Terry | 1971 | Slab | 78 ft | 2,137 | Fair |
| I 94 over Int Powder River No. I00094169+01011 | Prairie County | 7M SW Terry | 1971 | Slab | 78 ft | 2,137 | Fair |
| I 15 over Int Kidd No. I00015029+06021 | Beaverhead County | 5.6M N Dell-Kidd LN | 1971 | Slab | 78 ft | 2,116 | Fair |
| I 15 over Int Kidd No. I00015029+06022 | Beaverhead County | 5.6M N Dell-Kidd LN | 1971 | Slab | 78 ft | 2,116 | Fair |
| I 94 over Sep Road 240 No. I00094208+09521 | Dawson County | 1M SW Glendive | 1976 | Slab | 78 ft | 2,111 | Fair |
| I 94 over Sep Road 240 No. I00094208+09522 | Dawson County | 1M SW Glendive | 1976 | Slab | 78 ft | 2,111 | Fair |
| I 94 over Sep Wright LN No. I00094108+02112 | Rosebud County | 14M E Forsyth | 1970 | Slab | 78 ft | 2,094 | Fair |
| IRR - I 90 over Sep County Road No. I00090520+03611 | Big Horn County | 10.5M N Lodge Grass | 1980 | Slab | 78 ft | 2,082 | Fair |
| IRR - I 90 over Sep County Road No. I00090520+03612 | Big Horn County | 10.5M N Lodge Grass | 1980 | Slab | 80 ft | 2,082 | Fair |
| IRR - I 90 over Sep County Road No. I00090523+06361 | Big Horn County | 6.8M N Lodge Grass | 1980 | Slab | 79 ft | 2,082 | Fair |
| IRR - I 90 over Sep County Road No. I00090523+06362 | Big Horn County | 6.8M N Lodge Grass | 1980 | Slab | 79 ft | 2,082 | Fair |
| IRR - US 2 over Devil Creek No. P00001189+08181 | Flathead County | 6M SW Summit | 1963 | Slab | 28 ft | 2,025 | Fair |
| IRR - I 90 over Sep Local Road No. I00090532+04021 | Big Horn County | 1.9M S Lodge Grass | 1985 | Slab | 81 ft | 2,013 | Fair |
| IRR - I 90 over Sep Local Road No. I00090532+04022 | Big Horn County | 1.9M S Lodge Grass | 1985 | Slab | 81 ft | 2,013 | Fair |
| IRR - I 90 over Sep Local Road No. I00090533+08171 | Big Horn County | 3.7M S Lodge Grass | 1985 | Slab | 61 ft | 2,013 | Fair |
| IRR - I 90 over Sep Local Road No. I00090533+08172 | Big Horn County | 3.7M S Lodge Grass | 1985 | Slab | 61 ft | 2,013 | Fair |
| IRR - I 90 over Sep Local Road No. I00090539+05881 | Big Horn County | 8.7M S Lodge Grass | 1985 | Slab | 81 ft | 2,013 | Fair |
| IRR - I 90 over Sep Local Road No. I00090539+05882 | Big Horn County | 8.7M S Lodge Grass | 1985 | Slab | 81 ft | 2,013 | Fair |
| S 200 over Wildlife Crossing No. P00024079+02301 | Lewis and Clark County | 6M NE Lincoln | 2014 | Slab | 24 ft | 1,991 | Good |
| S 200 over Wildlife Crossing No. P00024082+04281 | Lewis and Clark County | 9M NE Lincoln | 2014 | Slab | 24 ft | 1,991 | Good |
| I 15 over Sep 9th RD NE No. I00015304+06771 | Teton County | 3M N Power | 1972 | Slab | 80 ft | 1,969 | Good |
| I 15 over Sep 9th RD NE No. I00015304+06772 | Teton County | 3M N Power | 1972 | Slab | 80 ft | 1,969 | Good |
| Upper Spring CR RD over Mill Ditch No. S00238000+00271 | Fergus County | Lewistown | 1958 | Slab | 49 ft | 1,955 | Fair |
| Going-To-The-Sun R over Haystack Creek No. 1430041P0000000 | Flathead County | 28 Mi. N. of Jct. Hwy. 2 | 1935 | Slab | 20 ft | 1,942 | Fair |
| I 15 over Sep Depot Hill Road No. I00015164+01431 | Jefferson County | Boulder | 1973 | Slab | 83 ft | 1,928 | Fair |
| I 15 over Sep Depot Hill Road No. I00015164+01432 | Jefferson County | Boulder | 1973 | Slab | 83 ft | 1,928 | Fair |
| S 287 over Wisconsin Creek No. P00029037+02091 | Madison County | 3M NW Sheridan | 1999 | Slab | 42 ft | 1,901 | Fair |
| S 78 over Butcher Creek No. P00078030+01551 | Stillwater County | 2M S Absarokee | 2010 | Slab | 60 ft | 1,898 | Good |
| Mchugh LN over Ten Mile Creek 087 No. M25058000+00501 | Lewis and Clark County | 2M N Helena | 1989 | Slab | 39 ft | 1,893 | Good |
| I 15 over Sep Snowline Stock LN No. I00015003+02111 | Beaverhead County | 2.5M N Monida | 1981 | Slab | 60 ft | 1,771 | Fair |
| I 15 over Sep Snowline Stock LN No. I00015003+02112 | Beaverhead County | 2.5M N Monida | 1981 | Slab | 60 ft | 1,771 | Fair |
| I 15 over Int Snowline Stock LN No. I00015009+05281 | Beaverhead County | 5.6M S Lima | 1981 | Slab | 78 ft | 1,771 | Fair |
| I 15 over Int Snowline Stock LN No. I00015009+05282 | Beaverhead County | 5.6M S Lima | 1981 | Slab | 78 ft | 1,771 | Fair |
| L ST over E Gallatin River 091 No. L16010000+05001 | Gallatin County | NE Bozeman | 2001 | Slab | 32 ft | 1,761 | Fair |
| US 12 over Drainage No. P00002082+06161 | Fallon County | West Edge Baker | 1998 | Slab | 64 ft | 1,600 | Fair |
| I 15 over Sep Elk Park-E Elk Park No. I00015143+09101 | Jefferson County | 12.4M N Butte | 1985 | Slab | 81 ft | 1,576 | Fair |
| I 15 over Sep Elk Park-E Elk Park No. I00015143+09102 | Jefferson County | 12.4M N Butte | 1985 | Slab | 81 ft | 1,576 | Fair |
| S 205-FRONTAGE RD over Mid Fork Madison River No. S00205001+02381 | Gallatin County | 2M E Three Forks | 1990 | Slab | 98 ft | 1,501 | Fair |
| 9th Ave SW over Lone Tree Creek 083 No. M42104000+00101 | Richland County | SIDNEY-9th Ave SW | 1999 | Slab | 123 ft | 1,494 | Fair |
| IRR - US 2 over Oswego Creek No. P00001579+04911 | Valley County | 1M N Oswego | 1973 | Slab | 61 ft | 1,479 | Fair |
| US 89 over Rock Creek No. P00059012+02781 | Park County | 2M SE Clyde Park | 1984 | Slab | 79 ft | 1,457 | Fair |
| US 2 over Miller Creek No. P00001056+07231 | Lincoln County | 14M W Happy`s Inn | 1988 | Slab | 34 ft | 1,429 | Good |
| US 2 over Beaver Creek Overflow No. P00001490+05771 | Phillips County | 9M W Saco | 1968 | Slab | 92 ft | 1,409 | Fair |
| US 2 over Beaver Creek Overflow No. P00001491+08241 | Phillips County | 7M W Saco | 1968 | Slab | 92 ft | 1,409 | Fair |
| SW Ash ST over Big Spring Creek No. U07110000+03101 | Fergus County | Lewistown-Sw Ash ST | 1962 | Slab | 52 ft | 1,394 | Fair |
| Going-To-The-Sun R over Avalanche Creek No. 1430018P0000000 | Flathead County | 17 Miles Northeast of U.S | 1935 | Slab | 59 ft | 1,230 | Fair |
| Going-To-The-Sun R over Logan Creek No. 1430026P0000000 | Flathead County | 21.5 Miles Northeast of U | 1925 | Slab | 44 ft | 1,230 | Fair |
| Black LN over Surprise Ditch 056 No. L41318001+04001 | Ravalli County | 2M N Hamilton | 2013 | Slab | 30 ft | 1,206 | Good |
| Frontage Rd-S 205 over Drainage No. S00205008+03441 | Gallatin County | 2M NW Manhattan | 1931 | Slab | 23 ft | 1,162 | Fair |
| US 2 over Clover Creek No. P00001648+03291 | Roosevelt County | 5M E Culbertson | 1967 | Slab | 92 ft | 1,144 | Fair |
| US 287 over Grayling Creek No. P00087020+02541 | Gallatin County | 10M NW West Yellowstone | 1964 | Slab | 76 ft | 1,132 | Fair |
| US 93 FH 19 over Rye Creek No. P00007025+09211 | Ravalli County | 5M SE Darby | 1990 | Slab | 61 ft | 1,099 | Fair |
| Nye Rd-S 419 over E Rosebud Creek Overflow No. S00419000+01001 | Stillwater County | 3M NE Fishtail | 1992 | Slab | 60 ft | 1,074 | Fair |
| Nye Rd-S 419 over East Rosebud Creek No. S00419000+02001 | Stillwater County | 3M NE Fishtail | 1992 | Slab | 91 ft | 1,074 | Fair |
| Nye Rd-S 419 over W Rosebud Creek Overflow No. S00419003+05001 | Stillwater County | Fishtail | 1991 | Slab | 40 ft | 1,074 | Good |
| Nye Rd-S 419 over West Rosebud Creek No. S00419003+06001 | Stillwater County | Fishtail | 1991 | Slab | 79 ft | 1,061 | Fair |
| Airport RD over Lone Tree Creek No. U10401000+04001 | Richland County | Sidney-Airport RD | 1999 | Slab | 129 ft | 1,037 | Fair |
| US 287 over Beaver Creek No. P00087007+01971 | Gallatin County | 24M NW West Yellowstone | 1964 | Slab | 125 ft | 1,010 | Fair |
| Breeze Way Road over Willow Creek 016 No. 000000201902998 | Gallatin County | 2M S Willow Creek | 2019 | Slab | 32 ft | 1,004 | Good |
| S 273 over Warm Springs Creek No. S00273000+07001 | Deer Lodge County | 2M NE Anaconda | 1988 | Slab | 70 ft | 1,000 | Fair |
| Lake Helena DR over Causeway-Lake Helena 072 No. L25100000+07001 | Lewis and Clark County | 8M N East Helena | 1944 | Slab | 25 ft | 971 | Fair |
| S Frontage RD 011 over Dempsey Creek 059 No. L39242004+03001 | Powell County | 5M S Deer Lodge | 1930 | Slab | 64 ft | 916 | Poor |
| S 69 over Little Boulder River No. 000000000006168 | Jefferson County | 3M SE Boulder | 2016 | Slab | 96 ft | 913 | Fair |
| S 69 over Animal Crossing No. 000000000007045 | Jefferson County | 5M S Boulder | 2016 | Slab | 39 ft | 913 | Good |
| IRR - S 313 over Williams Coulee No. 000000202106632 | Big Horn County | 1M S Hardin | 2021 | Slab | 73 ft | 899 | Good |
| S Rocker RD over Silver Bow Creek 007 No. L47207000+01001 | Silver Bow County | SE Rocker | 1987 | Slab | 51 ft | 869 | Fair |
| US 191 over Warm Springs Creek No. P00043010+00561 | Fergus County | 5M SW Hilger | 2011 | Slab | 92 ft | 851 | Fair |
| US 12 over Timber Creek No. P00002077+04151 | Fallon County | 5M W Baker | 1998 | Slab | 79 ft | 825 | Fair |
| S 13 over S Fork Buffalo Creek No. P00025008+05121 | McCone County | 8M NE Circle | 1988 | Slab | 61 ft | 792 | Fair |
| US 12 over Deep Creek No. P00014011+09751 | Broadwater County | 11M E Townsend | 2015 | Slab | 72 ft | 720 | Fair |
| US 12 over Deep Creek No. P00014014+08001 | Broadwater County | 14M E Townsend | 2015 | Slab | 73 ft | 720 | Good |
| US 12 over Deep Creek No. P00014015+00711 | Broadwater County | 14M E Townsend | 2015 | Slab | 73 ft | 720 | Good |
Counties with the most
| Beaverhead County | 29 |
| Jefferson County | 22 |
| Fergus County | 20 |
| Yellowstone County | 19 |
| Lewis and Clark County | 18 |
| Gallatin County | 18 |
| Big Horn County | 17 |
| Park County | 15 |
| Madison County | 14 |
| Powell County | 13 |
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