Utah bridge conditions
3,144 inventoried bridges · 109 rated poor · county by county
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- 109 of Utah's 3,144 inventoried bridges are rated in poor condition (3.5%) in the 2025 National Bridge Inventory, as of .
- 659 bridges (21.0%) are rated good and 2,376 (75.6%) fair.
- The national poor rate is about 6.7%; Utah is at or below it (see all states ranked).
- The busiest poor-rated bridge in the state is I-80 (SR-80) over SR-89 (US-89) State St. in Salt Lake County, carrying about 127,090 vehicles a day.
By the measure that matters most - the most traffic on a poor rating - it is I-80 (SR-80) over SR-89 (US-89) State St. in Salt Lake County, built 1966, carrying about 127,090 vehicles a day. That is a repair-priority flag, not a collapse warning: what a poor rating does and does not mean. See the worst bridge in every state.
Good 21.0% · Fair 75.6% · Poor 3.5% of 3,144 bridges
Bridge conditions by county
Sorted by the number of poor-rated bridges. Click any county for its full bridge list.
| County | Bridges | Rated poor | Poor % |
|---|---|---|---|
| Salt Lake County | 666 | 29 | 4.4% |
| Summit County | 137 | 13 | 9.5% |
| Box Elder County | 184 | 11 | 6.0% |
| Weber County | 129 | 9 | 7.0% |
| Cache County | 96 | 7 | 7.3% |
| Duchesne County | 89 | 6 | 6.7% |
| Garfield County | 93 | 5 | 5.4% |
| Rich County | 20 | 4 | 20.0% |
| Uintah County | 90 | 3 | 3.3% |
| Utah County | 274 | 3 | 1.1% |
| Beaver County | 53 | 2 | 3.8% |
| Carbon County | 72 | 2 | 2.8% |
| Juab County | 60 | 2 | 3.3% |
| Millard County | 72 | 2 | 2.8% |
| Morgan County | 55 | 2 | 3.6% |
| Wayne County | 28 | 2 | 7.1% |
| Davis County | 147 | 1 | 0.7% |
| Emery County | 125 | 1 | 0.8% |
| Grand County | 121 | 1 | 0.8% |
| Iron County | 69 | 1 | 1.4% |
| Sevier County | 157 | 1 | 0.6% |
| Wasatch County | 32 | 1 | 3.1% |
| Washington County | 177 | 1 | 0.6% |
| Daggett County | 13 | 0 | 0.0% |
| Kane County | 30 | 0 | 0.0% |
| Piute County | 19 | 0 | 0.0% |
| San Juan County | 49 | 0 | 0.0% |
| Sanpete County | 52 | 0 | 0.0% |
| Tooele County | 35 | 0 | 0.0% |
The 25 busiest poor-rated bridges in Utah
Frequently asked questions
How many bridges in Utah are in poor condition?
109 of Utah's 3,144 inventoried highway bridges are rated in poor condition (3.5%) in the 2025 National Bridge Inventory. 'Poor' is FHWA's classification for a bridge whose deck, superstructure, or substructure is rated 4 or lower on the 0-9 scale; it was formerly called 'structurally deficient'.
Are the poor-rated bridges in Utah safe to drive on?
A poor rating flags advanced deterioration that needs repair or close monitoring; it does not by itself mean a bridge is unsafe. Bridges judged unsafe are closed or restricted to lighter loads by the owner. Inspections continue on all open bridges, generally at least every 24 months under the National Bridge Inspection Standards.
Source: FHWA National Bridge Inventory, 2025 vintage, reported by the Utah DOT.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.