Bridge Safety in Montana
5,235 bridges — 388 Poor condition — avg age 47 years.
Bridge Inventory
| Total Bridges | 5,235 |
| Good Condition | 1,682 |
| Fair Condition | 3,165 |
| Poor Condition | 388 |
| Oldest Bridge | Built 1881 |
| Average Age | 47 years |
Condition Summary
| % Good | 32.1% |
| % Fair | 60.5% |
| % Poor | 7.4% |
Highest-Traffic Poor Condition Bridges in Montana
Poor condition bridges sorted by daily traffic — the most urgent safety concerns.
| Bridge | Condition | Year Built | ADT | Length |
|---|---|---|---|---|
| INT RESERVE STREET | Poor | 1966 | 13,664 | — |
| CLARK FORK RIVER | Poor | 1970 | 13,081 | — |
| CLARK FORK RIVER | Poor | 1964 | 9,168 | — |
| U1024-25-RR | Poor | 1960 | 8,576 | — |
| U1025-RR | Poor | 1960 | 8,576 | — |
| ABANDONED RR | Poor | 1969 | 8,575 | — |
| FLATHEAD RIVER | Poor | 1955 | 8,310 | — |
| NINE PIPE RESERVOIR | Poor | 1933 | 8,158 | — |
| INT LINCOLN-I 15 | Poor | 1962 | 7,492 | — |
| RR | Poor | 1973 | 5,992 | — |
| RR | Poor | 1973 | 5,992 | — |
| BIG CHERRY CREEK | Poor | 1976 | 5,295 | — |
| INT W GARRISON-RR | Poor | 1979 | 5,232 | — |
| YELLOWSTONE RIVER | Poor | 1957 | 5,017 | — |
| CLEAR CREEK | Poor | 1973 | 4,317 | — |
| SOUTH WILLOW CREEK | Poor | 1934 | 4,102 | — |
| CLARK FORK RIVER | Poor | 1965 | 4,088 | — |
| SEP ELIZABETH LN | Poor | 1965 | 4,088 | — |
| YELLOWSTONE RIVER 170 | Poor | 1949 | 4,005 | — |
| CLARK FORK RIVER | Poor | 1984 | 3,719 | — |
Oldest Bridges in Montana
| Bridge | Condition | Year Built | Age | ADT |
|---|---|---|---|---|
| REEDERS ALLEY 001 | Fair | 1881 | 145 yrs | 100 |
| JEFFERSON RIVER 063 | Poor | 1894 | 132 yrs | 100 |
| DEARBORN RIVER 011 | Fair | 1896 | 130 yrs | 31 |
| JEFFERSON RIVER 004 | Poor | 1897 | 129 yrs | 100 |
| JEFFERSON RIVER 046 | Fair | 1898 | 128 yrs | 87 |
| ST REGIS RIVER | Fair | 1900 | 126 yrs | 50 |
| LYONS CREEK 032 | Good | 1900 | 126 yrs | 100 |
| LOCATE CREEK 045 | Fair | 1901 | 125 yrs | 23 |
| FLAT CREEK 036 | Poor | 1901 | 125 yrs | 100 |
| MADISON RIVER 046 | Fair | 1902 | 124 yrs | 100 |
Bridge Safety in Montana
Bridge condition data for Montana comes from the FHWA National Bridge Inventory. All publicly accessible bridges with a span over 20 feet are inspected at least every 24 months by certified bridge inspectors.