Bridge conditions in Niobrara County, Wyoming
34 inventoried bridges · 1 rated poor · 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
Niobrara County tracks close to typical: 1 of its 34 inventoried bridges (2.9%) are rated poor, against a national rate of about 7%.
- 1 of the 34 bridges in Niobrara County, Wyoming, are rated in poor condition (2.9%) in the 2025 National Bridge Inventory, as of .
- 12 bridges (35.3%) are rated good and 21 (61.8%) fair.
- The median Niobrara County bridge was built in 1991.
- The busiest poor-rated bridge is Ni Cnty Rd 9 over Cheyenne River (built 1920), carrying about 3 vehicles a day.
Good 35.3% · Fair 61.8% · Poor 2.9% of 34 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 |
|---|---|---|---|
| Ni Cnty Rd 9 over Cheyenne River | 1920 | 3 | Poor |
Busiest bridges in the county
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 18 over Niobrara River | 1988 | 2,942 | Fair |
| US 85 over UPRR | 2016 | 2,942 | Good |
| US 18 over Stockpass | 1970 | 2,406 | Good |
| US 18 over Old Woman Creek | 1971 | 2,150 | Fair |
| US 18 over Old Woman Creek | 1987 | 2,150 | Fair |
| US 18 over Mule Creek | 1988 | 2,150 | Fair |
| US 85 over Cheyenne River | 1990 | 1,084 | Fair |
| US 85 over Bobcat Creek | 1991 | 1,084 | Good |
| US 85 over Robbers Roost Creek | 1992 | 1,084 | Fair |
| US 20 over Niobrara River | 2003 | 754 | 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.