Bridge conditions in Iron County, Utah
69 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Iron County tracks close to typical: 1 of its 69 inventoried bridges (1.4%) are rated poor, against a national rate of about 7%.
- 1 of the 69 bridges in Iron County, Utah, are rated in poor condition (1.4%) in the 2025 National Bridge Inventory, as of .
- 8 bridges (11.6%) are rated good and 60 (87.0%) fair.
- The median Iron County bridge was built in 1973.
- The busiest poor-rated bridge is Nfsr 30095 over Duck Creek (built 1973), carrying about 50 vehicles a day.
Good 11.6% · Fair 87.0% · Poor 1.4% of 69 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 |
|---|---|---|---|
| Nfsr 30095 over Duck Creek | 1973 | 50 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-15 (SR-15) Nbl over SR-56 200 North Street | 1968 | 35,848 | Fair |
| I-15 (SR-15) Sbl over SR-56 200 North Street | 1968 | 35,848 | Fair |
| I-15 (SR-15) Nbl over Co Rd to Kanarraville | 1966 | 34,474 | Fair |
| I-15 (SR-15) Sbl over Co Rd to Kanarraville | 1966 | 34,474 | Fair |
| I-15 (SR-15)NB&SB over Kanarra Creek | 1966 | 33,319 | Fair |
| I-15 NB over East Nichols Canyon Road | 2021 | 29,000 | Good |
| I-15 SB over East Nichols Canyon Road | 2021 | 29,000 | Good |
| I-15 (SR-15) Sbl over CO.RD. NO.of SUMMIT INT. | 1973 | 28,854 | Fair |
| I-15(SR-15)NB&Ramp over Fremont Wash | 1956 | 25,239 | Fair |
| I-15 (SR-15) Nbl over Co. Rd. to Parowan Gap | 1973 | 24,884 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Utah: Utah 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.