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Bridge conditions in Pondera County, Montana

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

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

4 of the 96 bridges the federal inventory lists in Pondera County are rated poor; the rest split 49 good and 43 fair.

4 of the 96 bridges in Pondera County, Montana, are rated in poor condition (4.2%) in the 2025 National Bridge Inventory, as of August 20, 2026.
49 bridges (51.0%) are rated good and 43 (44.8%) fair.
The median Pondera County bridge was built in 1972.
The busiest poor-rated bridge is Irr - US 89 over Blacktail Creek (built 1965), carrying about 1,012 vehicles a day.

Good 51.0% · Fair 44.8% · Poor 4.2% of 96 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
Irr - US 89 over Blacktail Creek	1965	1,012	Poor
S 21 over Int Midway I 15	1972	540	Poor
Irr - S 358 over Two Medicine River	1968	243	Poor
Sollid Rd over Drainage	1973	16	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I 15 over S Pondera Coulee	1964	3,248	Fair
I 15 over RR	1972	1,727	Good
I 15 over RR	1972	1,727	Good
I 15 over Dry Fork Marias River	1972	1,727	Good
I 15 over Dry Fork Marias River	1972	1,727	Good
S 21 over RR	1972	1,725	Good
I 15 over Pondera Canal	1972	1,510	Fair
I 15 over Pondera Canal	1972	1,510	Good
I 15 over Pondera Coulee	1972	1,480	Good
I 15 over Pondera Coulee	1972	1,480	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.