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Bridge conditions in McCone County, Montana

43 inventoried bridges · 4 rated poor · 2025 National Bridge Inventory

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

The federal inventory lists 43 bridges in McCone County: 5 rated good, 34 fair, and 4 poor.

4 of the 43 bridges in McCone County, Montana, are rated in poor condition (9.3%) in the 2025 National Bridge Inventory, as of August 20, 2026.
5 bridges (11.6%) are rated good and 34 (79.1%) fair.
The median McCone County bridge was built in 1962.
The busiest poor-rated bridge is S 200 over Cemetery Coulee (built 1939), carrying about 680 vehicles a day.

Good 11.6% · Fair 79.1% · Poor 9.3% 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 200 over Cemetery Coulee	1939	680	Poor
S 200 over Drainage	1939	680	Poor
S 200 over Drainage	1939	680	Poor
S 253 over Redwater River	1950	420	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
S 200 over Redwater River	1933	1,263	Fair
Irr - S 13 over Drainage	1995	985	Fair
Irr - S 13 over Drainage-stockpass	1995	985	Good
Irr - S 13 over Nickwall Creek	1995	985	Fair
S 200S over Buffalo Spring Creek	1966	971	Fair
S 13 over Horse Creek	1988	910	Fair
S 13 over Lost Creek	1988	910	Fair
Irr - S 13 over Gady Coulee	1994	905	Fair
S 13 over Wolf Creek	1993	901	Fair
S 13 over Drainage	1994	901	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.