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Bridge conditions in Beaverhead County, Montana

227 inventoried bridges · 24 rated poor · 2025 National Bridge Inventory

United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled August 20, 2026

Of the 227 Beaverhead County bridges in the federal inventory, 24 carry a poor rating. That 10.6% share is roughly 2x the national average.

24 of the 227 bridges in Beaverhead County, Montana, are rated in poor condition (10.6%) in the 2025 National Bridge Inventory, as of August 20, 2026.
53 bridges (23.3%) are rated good and 150 (66.1%) fair.
The median Beaverhead County bridge was built in 1980.
The busiest poor-rated bridge is Hwy 91 N over Beaverhead River 033 (built 1946), carrying about 2,676 vehicles a day.

Good 23.3% · Fair 66.1% · Poor 10.6% of 227 bridges

Bridges rated poor

Every bridge in the county with a poor rating, busiest first. Poor means a major component is rated 4 or lower on FHWA's 0-9 scale; it is a repair flag, not a closure notice.

Bridge	Built	Vehicles/day	Condition
Hwy 91 N over Beaverhead River 033	1946	2,676	Poor
I 15 over Int Lima-bailey St	1959	1,863	Poor
I 15 over Int Monida S 509	1959	1,771	Poor
Mt Hwy 91 over RR	1936	612	Poor
Hwy 91 N over Big Hole River 041	1940	158	Poor
Corinne Trail over Horse Prairie Creek 043	2022	100	Poor
Upper N Fork Rd over N Fk Bighole River 064	1977	100	Poor
Rock Creek Rd over Big Lake Creek 081	1958	100	Poor
Big Swamp CR Rd / over Big Hole River 089	1925	100	Poor
Miner Lake Rd over Governor Creek 092	1951	100	Poor
Stibal Ln over Red Rock River 053	1975	100	Poor
Brundage Ln over Red Rock River 052	1920	100	Poor
Browns Bridge Rd over Big Hole River 123	1915	100	Poor
Red Rock Rd over Limekiln Canyon 022	1931	60	Poor
Canyon CR Road over Canyon CR	1952	50	Poor
Fdr 606 over Birch CR	1954	40	Poor
Fdr 945 over Ruby CR	1968	20	Poor
Fdr 624 over Ruby CR	1952	20	Poor
Fdr 1203 over Tie Creek	1964	15	Poor
Big Swamp CR Rd over Big Swamp CR	1968	15	Poor
Swamp CR Road over Big Swamp CR	1968	15	Poor
Ryan Canyon Rd over Beaverhead River 023	1908	14	Poor
No Data Entered over Wise River	1992	6	Poor
Roe Ln over Red Rock River 121	1913	4	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
S 89 over Local-blacktail Cr-rr	1974	4,241	Fair
S 89 over Int North Dillon I 15	1973	4,241	Fair
I 15 over Drainage Irr Ditch	1973	3,915	Fair
I 15 over Birch Creek	1973	3,852	Fair
I 15 over Int Jackson-hwy 278	1982	2,863	Fair
I 15 over Int Jackson-hwy 278	1982	2,863	Good
I 15 over Beaverhead River	1982	2,863	Fair
I 15 over Beaverhead River	1982	2,863	Fair
I 15 over Poindexter Slough	1983	2,863	Fair
I 15 over Poindexter Slough	1983	2,863	Fair

Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.

Every bridge in Beaverhead County → - all 227, busiest first, each with its own condition record.

All of Montana: Montana bridge conditions by county · every download on the data page.

Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.