Wyoming has 3,138 bridges on public roads, according to the FHWA National Bridge Inventory. Of those, 224 are rated in poor condition — a rate of 7.1% — 6% above the national average of 6.7%. Another 2,019 are in fair condition, while 895 are in good condition.
Use the interactive Wyoming bridge map below to explore every bridge, color-coded by condition. Click any cluster to zoom in, then click an individual bridge for its route, structural ratings, year built, daily traffic, and last inspection date. Filter by condition using the checkboxes, or switch to satellite view to see bridges from above. For a national comparison, see the full US bridges interactive map.
Wyoming Bridge Conditions by the Numbers
- 3,138 total bridges on public roads in Wyoming
- 224 in poor condition (7.1%) — above the national average of 6.7%
- 2,019 in fair condition (64.3%)
- 895 in good condition (28.5%)
- Oldest bridge in the inventory: US 30 Service Road, built 1908
Oldest Bridges in Wyoming
The oldest bridges in Wyoming date back to the 1900s. The ten oldest Wyoming bridges still in the national inventory:
| Route / Facility | Crosses | Year Built | Condition |
|---|---|---|---|
| US 30 Service Road | Smiths Fork River | 1908 | Poor |
| GRAND TETON NP RD | SNAKE RIVER | 1911 | Fair |
| County Road 60 | Ft Laramie Canal | 1913 | Fair |
| Sh Cnty Rd 2 | North Piney Creek | 1914 | Fair |
| County Road 90 | Ft Laramie Canal | 1915 | Fair |
| LONE STAR GEYSER R | FIREHOLE RIVER | 1915 | Fair |
| Cb Cnty Rd 660 | North Platte River | 1915 | Poor |
| Cb Cnty Rd 680 | Encampment River | 1915 | Poor |
| Cb Cnty Rd 3 | Medicine Bow River | 1915 | Poor |
| Sh Cnty Rd 140 | BNSF Railway | 1916 | Poor |
Most Concerning Wyoming Bridges: Poor Condition and High Traffic
The bridges of greatest concern combine a poor structural rating with high daily traffic loads. These Wyoming bridges carry the most vehicles per day while rated in poor condition:
| Route / Facility | Crosses | Daily Traffic | Year Built | Deck | Superstructure | Substructure |
|---|---|---|---|---|---|---|
| US 89 | Flat Creek | 15,780 vehicles/day | 1938 | Poor (4) | Satisfactory (6) | Fair (5) |
| WYO 212 | Crow Creek | 13,625 vehicles/day | 1976 | Poor (4) | Satisfactory (6) | Fair (5) |
| WYO 212 | I-80 | 13,143 vehicles/day | 1977 | Fair (5) | Poor (4) | Fair (5) |
| I-25 NBL | I-80 | 11,096 vehicles/day | 1963 | Poor (4) | Satisfactory (6) | Satisfactory (6) |
| I-25 SBL | UPRR / US 30 | 11,014 vehicles/day | 1963 | Satisfactory (6) | Good (7) | Poor (4) |
How Wyoming Bridge Conditions Are Assessed
Bridge condition in the NBI is determined by ratings of three structural components — deck, superstructure, and substructure — on a scale of 0 (failed) to 9 (excellent). A bridge is classified as good when all three components score 7 or above. It is classified as poor when any component scores 4 or below. Ratings of 5 or 6 on any component with no component below 5 result in a fair classification. WYDOT coordinates inspections across Wyoming in line with FHWA standards, with most bridges inspected on a 24-month cycle.
Frequently Asked Questions
How many bridges in Wyoming are in poor condition?
224 of Wyoming’s 3,138 bridges are currently rated in poor condition by the FHWA National Bridge Inventory, a rate of 7.1%.
What is the oldest bridge in
The oldest bridge recorded in Wyoming’s NBI inventory is US 30 Service Road, built in 1908.
What does a poor bridge rating mean?
A poor rating means at least one of a bridge’s three key structural components — deck, superstructure, or substructure — has been rated 4 or below on the NBI 0-9 scale. A rating of 4 is defined as “poor condition,” and ratings of 3, 2, 1, or 0 indicate increasingly serious deterioration. Poor-rated bridges are not necessarily unsafe or closed, but they require priority attention and monitoring.
View all 624,000+ US bridges on the national interactive map
Compare with neighboring states: Colorado bridges map | Idaho bridges map | Montana bridges map | Nebraska bridges map | South Dakota bridges map | Utah bridges map
