Home › Idaho › Washington County

Bridge conditions in Washington County, Idaho

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

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

The federal inventory lists 80 bridges in Washington County: 26 rated good, 50 fair, and 4 poor.

4 of the 80 bridges in Washington County, Idaho, are rated in poor condition (5.0%) in the 2025 National Bridge Inventory, as of August 20, 2026.
26 bridges (32.5%) are rated good and 50 (62.5%) fair.
The median Washington County bridge was built in 1982.
The busiest poor-rated bridge is Stc 8217;COVE Road over Weiser River (built 1917), carrying about 490 vehicles a day.

Good 32.5% · Fair 62.5% · Poor 5.0% of 80 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
Stc 8217;COVE Road over Weiser River	1917	490	Poor
Stc 3007;UNITY Rd over Weiser River	1910	180	Poor
Sage Creek Road over Sage Creek	1965	50	Poor
Lower Crane Road over Crane Creek	1955	20	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US 95 over Robertson Slough	2017	7,800	Good
US 95 over Weiser River	2013	7,700	Fair
US 95 over Monroe Creek	1999	5,600	Good
US 95 over Galloway Canal	1999	5,600	Good
US 95 over Manns Creek	2004	4,400	Fair
US 95 over Sage Creek	1964	4,400	Fair
US 95 over Dry Creek	1964	4,400	Fair
US 95 over Keithly Creek	1991	4,400	Fair
US 95 over Pine Creek	2021	4,400	Good
US 95 over Spring Creek	1961	4,400	Fair

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

All of Idaho: Idaho 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.