Gem County Bridge Report Card
Gem County scores 77 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Gem County, Idaho
Gem County has 57 bridges in the National Bridge Inventory, with 3 rated poor and 3 rated scour-critical. Its poor-condition share of 5.3% is at or below the 5.4% statewide average. Poor-condition bridges carry about 1,020 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Gem County a Bridge Condition Exposure Score of 77/100 (C). The county has 57 bridges in the National Bridge Inventory, including 3 in poor condition and 3 rated scour-critical. Poor-condition bridges carry about 1,020 daily vehicle crossings. Poor condition does not mean unsafe; bridges judged unsafe are closed or restricted by transportation agencies.
How the Score Breaks Down
| Factor | Weight | County Value | Penalty |
|---|---|---|---|
| Poor-condition bridge share | 40 | 5.3% | 10.5 |
| Poor-condition traffic exposure | 25 | 1.3% of measured traffic | 1.0 |
| Scour-critical bridge share | 20 | 5.3% | 10.5 |
| Average age vs national baseline | 10 | 50 years vs 48 nationally | 0.7 |
| Traffic-data completeness | 5 | 76,708 measured daily crossings | 0.0 |
Score = 100 minus weighted penalties. The score is a comparative research signal, not an official safety rating. Read the full methodology.
County Comparisons
| County Poor-Condition Share | 5.3% |
| State Poor-Condition Share | 5.4% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 5.3% |
| Average Bridge Age | 50 years |
| Poor-Condition Traffic Exposure | 1,020 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Gem County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Rammage Meadows RD over Third Fk.chief Eagle Eye | Poor condition + traffic exposure | Poor | 20 | 1963 |
| Cascade Road over Enterprise Canal | Poor condition + traffic exposure | Poor | 950 | 1950 |
| Little Rock Road over Noble Drain | Poor condition + traffic exposure | Poor | 50 | 1955 |
| Stc3830;idaho BLVD over Payette River;e.letha Br | Scour-critical foundation rating | Fair | 1,400 | 1960 |
| Montour Road over Payette Rvr(montour Br) | Scour-critical foundation rating | Fair | 310 | 1967 |
| SH 16 over Black Canyon Canal | High traffic | Fair | 12,000 | 1966 |
| SH 52 over Farmers Coop Canal | High traffic | Good | 11,500 | 1992 |
| SH 52 over Payette River;emmett Br. | High traffic | Fair | 10,500 | 1971 |
| SH 52 over Farmers Coop Canal | High traffic | Good | 7,000 | 2001 |
| Sma7190;substation over Last Chance Canal | High traffic | Good | 6,800 | 2016 |
Important safety note
Poor condition does not mean a bridge is unsafe. It means at least one major component has significant deterioration and the bridge is a priority for maintenance, repair, or replacement. Bridges judged unsafe are closed or restricted by transportation agencies.