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Bridge conditions in Chouteau County, Montana

43 inventoried bridges · 2 rated poor · 2025 National Bridge Inventory

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

The federal inventory lists 43 bridges in Chouteau County: 25 rated good, 16 fair, and 2 poor.

2 of the 43 bridges in Chouteau County, Montana, are rated in poor condition (4.7%) in the 2025 National Bridge Inventory, as of August 20, 2026.
25 bridges (58.1%) are rated good and 16 (37.2%) fair.
The median Chouteau County bridge was built in 1986.
The busiest poor-rated bridge is S 80-13th St over Missouri River (built 1962), carrying about 930 vehicles a day.

Good 58.1% · Fair 37.2% · Poor 4.7% of 43 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
S 80-13th St over Missouri River	1962	930	Poor
Upper Highwood CR over Highwood Creek 069	1969	100	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US 87 over Abandoned Railroad	1974	1,727	Fair
Irr - US 87 over School Section Coulee	1970	1,694	Good
Irr - US 87 over Big Sandy Creek	1990	1,694	Good
US 87 over Marias River	1988	1,417	Good
S 80-13th St over Missouri River	1962	930	Poor
S 80 over RR	1953	849	Fair
S 80 over Shonkin Creek	2003	696	Good
S 223 over Teton River	1953	541	Fair
S 80 over Boyle-o`hanlon Coulees	1939	479	Fair
Broadway Ave over Highwood Creek	1999	372	Good

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

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.