Iron County Bridge Report Card
Iron County scores 94 out of 100 on BridgeLookup's Bridge Condition Exposure Score, based on FHWA National Bridge Inventory records.
Iron County, Utah
Iron County has 69 bridges in the National Bridge Inventory, with 1 rated poor and 1 rated scour-critical. Its poor-condition share of 1.4% is at or below the 3.5% statewide average. Poor-condition bridges carry about 50 daily vehicle crossings.
Quote-Ready Local Facts
Copyable Facts for Reporters
BridgeLookup.com gives Iron County a Bridge Condition Exposure Score of 94/100 (A). The county has 69 bridges in the National Bridge Inventory, including 1 in poor condition and 1 rated scour-critical. Poor-condition bridges carry about 50 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 | 1.4% | 2.9 |
| Poor-condition traffic exposure | 25 | 0.0% of measured traffic | 0.0 |
| Scour-critical bridge share | 20 | 1.4% | 2.9 |
| Average age vs national baseline | 10 | 49 years vs 48 nationally | 0.5 |
| Traffic-data completeness | 5 | 754,401 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 | 1.4% |
| State Poor-Condition Share | 3.5% |
| National Poor-Condition Share | 6.7% |
| County Scour-Critical Share | 1.4% |
| Average Bridge Age | 49 years |
| Poor-Condition Traffic Exposure | 50 vehicles/day |
Bridges to Watch
Top Bridges to Watch in Iron County
| Bridge | Reason | Condition | Daily Traffic | Year Built |
|---|---|---|---|---|
| Nfsr 30095 over Duck Creek | Poor condition + traffic exposure | Poor | 50 | 1973 |
| Paint Shop RD over Coal Creek | Scour-critical foundation rating | Fair | 50 | 1987 |
| I-15 (sr-15) Nbl over Sr-56 200 North Street | High traffic | Fair | 35,848 | 1968 |
| I-15 (sr-15) Sbl over Sr-56 200 North Street | High traffic | Fair | 35,848 | 1968 |
| I-15 (sr-15) Nbl over Co RD To Kanarraville | High traffic | Fair | 34,474 | 1966 |
| I-15 (sr-15) Sbl over Co RD To Kanarraville | High traffic | Fair | 34,474 | 1966 |
| I-15 (sr-15)nb&sb over Kanarra Creek | High traffic | Fair | 33,319 | 1966 |
| I-15 NB over East Nichols Canyon Road | High traffic | Good | 29,000 | 2021 |
| I-15 SB over East Nichols Canyon Road | High traffic | Good | 29,000 | 2021 |
| I-15 (sr-15) Sbl over Co.rd. No.of Summit Int. | High traffic | Fair | 28,854 | 1973 |
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.