Bridge conditions in Natrona County, Wyoming
135 inventoried bridges · 5 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 135 bridges in Natrona County: 45 rated good, 85 fair, and 5 poor.
- 5 of the 135 bridges in Natrona County, Wyoming, are rated in poor condition (3.7%) in the 2025 National Bridge Inventory, as of .
- 45 bridges (33.3%) are rated good and 85 (63.0%) fair.
- The median Natrona County bridge was built in 1977.
- The busiest poor-rated bridge is Wyo 220 over Casper Canal (built 1967), carrying about 3,090 vehicles a day.
Good 33.3% · Fair 63.0% · Poor 3.7% of 135 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 |
|---|---|---|---|
| Wyo 220 over Casper Canal | 1967 | 3,090 | Poor |
| Na Cnty Rd 412 over Hogback Draw | 1929 | 165 | Poor |
| Hereford Lane over I-25 | 1960 | 136 | Poor |
| Na Cnty Rd 110 over South Fork Powder River | 1977 | 53 | Poor |
| Na Cnty Rd 102 over Badwater Creek | 1940 | 22 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| Wyo 220 over Garden Creek | 2001 | 26,351 | Fair |
| Wyo 220 over North Platte River | 1969 | 14,749 | Fair |
| Wyo 220 over BNSF Railway | 1969 | 14,641 | Fair |
| I-25 Sbl over North McKinley Street | 1958 | 12,618 | Fair |
| I-25 Nbl over North McKinley Street | 1958 | 12,577 | Fair |
| I-25 NBL and SBL over Walsh Drive | 2022 | 12,577 | Good |
| US 20 over North Platte River | 1979 | 12,160 | Fair |
| E 2nd Street over Elkhorn Creek | 2003 | 11,829 | Good |
| E 2nd Street over Claude Creek | 2004 | 11,829 | Good |
| WYO 258 (Wyo Blvd) over North Platte River | 1974 | 11,746 | Fair |
Source: FHWA National Bridge Inventory, 2025. Counts cover inventoried highway bridges over 20 feet; ratings are reported by the state DOT.
All of Wyoming: Wyoming 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.