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Bridge conditions in Silver Bow County, Montana

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

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

The federal inventory lists 70 bridges in Silver Bow County: 11 rated good, 57 fair, and 2 poor.

2 of the 70 bridges in Silver Bow County, Montana, are rated in poor condition (2.9%) in the 2025 National Bridge Inventory, as of August 20, 2026.
11 bridges (15.7%) are rated good and 57 (81.4%) fair.
The median Silver Bow County bridge was built in 1968.
The busiest poor-rated bridge is Empire Street over Drainage (built 1953), carrying about 100 vehicles a day.

Good 15.7% · Fair 81.4% · Poor 2.9% of 70 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
Empire Street over Drainage	1953	100	Poor
German Gulch Rd over Int Victor I 15 003	1961	100	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
I 15 over Bell Creek	1963	19,755	Fair
I-90 E&w over Abandoned Railroad	2019	15,011	Good
S Montana St over Silver Bow Creek	1970	14,718	Fair
I 15 over Int Rocker	1968	10,824	Fair
I 15 over Int Rocker	1968	10,824	Fair
I 90 over Whitetail Creek	1965	10,349	Fair
I 15 over Int S Montana Street	1961	9,878	Fair
I 15 over Int S Montana Street	1961	9,878	Fair
I 90 over Sep Laird St-frontage Rd	1967	7,506	Fair
I 15 over Local-rarus RR	2018	7,379	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.