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Scour Critical Bridges in Montana

166 bridges in Montana at risk from water erosion around foundations.

Scour Critical Bridges

Scour is the erosion of soil and rock around a bridge's foundation caused by moving water. When foundations are exposed or undermined, a bridge can collapse even if its deck and superstructure are in good condition. Scour is the leading cause of bridge failures in the US. These 166 bridges in Montana have been identified as vulnerable to scour damage.

Clear
Bridge State Scour Status Condition Year Built ADT
BRICKER SPARROW DITCH Montana Scour Critical — Countermeasures Installed Fair 1958 1,429
ALKALI CREEK 208 Montana Scour Critical — Countermeasures Installed Good 2014 1,178
YELLOWSTONE RIVER Montana Scour Critical — Countermeasures Installed Fair 1921 1,160
TONGUE RIVER Montana Scour Critical — Countermeasures Installed Fair 1970 877
EAST GALLATIN RIVER Montana Scour Critical — Countermeasures Installed Fair 1967 825
WHITE BEAR CREEK Montana Scour Critical — Countermeasures Installed Fair 1959 763
FERRY CREEK 037 Montana Scour Critical — Countermeasures Installed Fair 1938 677
CLARK FK-RR-HWY 106 Montana Scour Critical — Countermeasures Installed Fair 1972 603
MCDONALD CREEK Montana Scour Critical — Countermeasures Installed Fair 1962 560
SURPRISE DITCH 060 Montana Scour Critical — Countermeasures Installed Poor 1918 537
LITTLE BIGHORN RIVER Montana Scour Critical — Countermeasures Installed Fair 1962 514
DRY FORK MARIAS 080 Montana Scour Critical — Countermeasures Installed Fair 1931 511
ROSEBUD CREEK Montana Scour Critical — Countermeasures Installed Good 1989 507
APIKUNI CREEK Montana Scour Critical — Countermeasures Installed Fair 1931 452
WINDY CREEK Montana Scour Critical — Countermeasures Installed Fair 1931 452
BIG CHERRY CREEK 119 Montana Scour Critical — Countermeasures Installed Fair 1977 334
WARM SPRINGS CREEK 009 Montana Scour Critical — Countermeasures Installed Fair 1960 283
JEFFERSON RIVER 017 Montana Scour Critical — Countermeasures Installed Fair 1973 269
DRY CREEK 119 Montana Scour Critical — Countermeasures Installed Fair 2009 265
ELK CREEK 119 Montana Scour Critical — Countermeasures Installed Fair 1935 260
DRY CREEK Montana Scour Critical — Countermeasures Installed Fair 1970 246
MUSSELSHELL RIVER 008 Montana Scour Critical — Countermeasures Installed Fair 1970 208
TWO MEDICINE RIVER Montana Scour Critical — Countermeasures Installed Fair 1950 183
APPISTOKI CREEK Montana Scour Critical — Countermeasures Installed Fair 1929 183
MISSOURI RIVER 019 Montana Scour Critical — Countermeasures Installed Poor 1920 178
MUSSELSHELL RIVER Montana Scour Critical — Countermeasures Installed Fair 1962 172
TAFFY CREEK Montana Scour Critical — Countermeasures Installed Good 2020 168
ARROW CREEK 099 Montana Scour Critical — Countermeasures Installed Fair 1975 164
ROCK CREEK Montana Scour Critical — Countermeasures Installed Poor 1959 161
TIMBER CREEK Montana Scour Critical — Countermeasures Installed Fair 1960 153
BIG MUDDY CREEK OVERFLOW Montana Scour Critical — Countermeasures Installed Fair 1949 151
RUBY RIVER 023 Montana Scour Critical — Countermeasures Installed Poor 1927 133
BEAN CREEK Montana Scour Critical — Countermeasures Installed Fair 1957 121
BIG MUDDY CREEK 032 Montana Scour Critical — Countermeasures Installed Fair 1970 117
YELLOWSTONE RIVER 077 Montana Scour Critical — Countermeasures Installed Fair 1980 104
SMOKE CREEK Montana Scour Critical — Countermeasures Installed Poor 1954 101
BIG TIMBER CREEK Montana Scour Critical — Countermeasures Installed Good 2019 100
WOLF CREEK Montana Scour Critical — Countermeasures Installed Good 2022 100
MCDONALD CREEK Montana Scour Critical — Countermeasures Installed Good 2023 100
PRICKLY PEAR CREEK Montana Scour Critical — Countermeasures Installed Poor 2010 100
SOUTH DRY CREEK Montana Scour Critical — Countermeasures Installed Good 2022 100
CROW CREEK 066 Montana Scour Critical — Countermeasures Installed Good 2024 100
SHEEP CREEK 061 Montana Scour Critical — Countermeasures Installed Good 1999 100
COAL CREEK 027 Montana Scour Critical — Countermeasures Installed Poor 1950 100
COAL CREEK 038 Montana Scour Critical — Countermeasures Installed Poor 1971 100
BAD ROUTE CREEK 028 Montana Scour Critical — Countermeasures Installed Fair 1985 100
N FK THIRTEN MILE CR 091 Montana Scour Critical — Countermeasures Installed Poor 1983 100
WARM SPRINGS CREEK 016 Montana Scour Critical — Countermeasures Installed Poor 1912 100
WARM SPRINGS CREEK 078 Montana Scour Critical — Countermeasures Installed Fair 1980 100
SALT CREEK 053 Montana Scour Critical — Countermeasures Installed Fair 1984 100

Scour Critical Rating Codes

Code 2 — UnaddressedBridge is scour critical with no countermeasures installed. The foundation is vulnerable and no protective action has been taken.
Code 3 — Countermeasures InstalledProtective measures (riprap, sheet piling, etc.) have been installed to reduce scour risk, but the bridge remains classified as scour critical.
Code 6 — Countermeasures IneffectiveProtective measures were installed but have been assessed as ineffective. The bridge requires re-evaluation and additional action.

About Scour Critical Bridges

Scour critical bridges have been identified through underwater inspection or analysis as having foundations that are unstable or could become unstable during flood conditions. FHWA requires action plans for all scour critical bridges. Famous scour failures include the 1987 Schoharie Creek Bridge collapse in New York.

All Bridges Poor Condition Historic Bridges Bridge Stats