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Bridge conditions in Franklin County, Idaho

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

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

The federal inventory lists 23 bridges in Franklin County: 3 rated good, 18 fair, and 2 poor.

2 of the 23 bridges in Franklin County, Idaho, are rated in poor condition (8.7%) in the 2025 National Bridge Inventory, as of August 20, 2026.
3 bridges (13.0%) are rated good and 18 (78.3%) fair.
The median Franklin County bridge was built in 1970.
The busiest poor-rated bridge is Weston-fairview Rd over Bear River;e.weston Br. (built 1956), carrying about 1,000 vehicles a day.

Good 13.0% · Fair 78.3% · Poor 8.7% of 23 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
Weston-fairview Rd over Bear River;e.weston Br.	1956	1,000	Poor
Parkinson Road over Cub River	1926	310	Poor

Busiest bridges in the county

Bridge	Built	Vehicles/day	Condition
US 91 over Cub River	2006	8,600	Fair
US 91 over Bear River	2006	4,200	Fair
SH 36 over Bear River	2018	3,000	Good
SH 34 over Bear River;riverdale Br	1960	2,800	Fair
US 91 over West Cache Canal	1993	2,300	Good
SH 36 over Bear River	1960	1,300	Fair
SH 34 over Twin Lakes Canal	1958	1,200	Fair
SH 34 over Cottonwood Creek	1971	1,100	Fair
SH 34 over Bear River;cleveland Br.	1953	1,100	Fair
SH 34 over Trout Creek	1957	1,100	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.