Bridge conditions in Johnson County, Wyoming
204 inventoried bridges · 7 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
The federal inventory lists 204 bridges in Johnson County: 56 rated good, 141 fair, and 7 poor.
- 7 of the 204 bridges in Johnson County, Wyoming, are rated in poor condition (3.4%) in the 2025 National Bridge Inventory, as of .
- 56 bridges (27.5%) are rated good and 141 (69.1%) fair.
- The median Johnson County bridge was built in 1966.
- The busiest poor-rated bridge is I-25 Sbl over South Fork Powder River (built 1960), carrying about 1,647 vehicles a day.
Good 27.5% · Fair 69.1% · Poor 3.4% of 204 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 |
|---|---|---|---|
| I-25 Sbl over South Fork Powder River | 1960 | 1,647 | Poor |
| Jo Cnty Rd 1 over Rock Creek | 1994 | 168 | Poor |
| Jo Cnty Rd 204A over Crazy Woman Creek | 1950 | 98 | Poor |
| Jo Cnty Rd 13 over I-25 | 1968 | 75 | Poor |
| Jo Cnty Rd 85 over Rock Creek | 1976 | 56 | Poor |
| Jo Cnty Rd 14 over N F Crazy Woman Creek | 1997 | 53 | Poor |
| Jo Cnty Rd 78 over Middle Fork Powder River | 1989 | 13 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| I-25 / US 87 Bus over Clear Creek | 1975 | 5,733 | Fair |
| I-90 Wbl over Jo CR 213 (Monument Rd) | 1966 | 3,990 | Fair |
| I-90 Wbl over Jo CR 1 (Rock Creek Rd) | 1963 | 3,990 | Fair |
| I-90 Ebl over Jo CR 39 (Lake Ridge Rd) | 1966 | 3,980 | Fair |
| I-90 Ebl over Jo CR 1 (Rock Creek Rd) | 1963 | 3,980 | Fair |
| I-90 Wbl over Piney Creek | 1966 | 3,740 | Fair |
| I-90 Wbl over Lake De Smet Ditch | 1966 | 3,740 | Fair |
| I-90 Wbl over Lower Piney Creek Road | 1966 | 3,740 | Fair |
| I-90 Wbl over Machinery Pass | 1966 | 3,705 | Fair |
| I-90 Wbl over Jo CR 85 (Shell Creek) | 1966 | 3,705 | 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.