Ni Cnty Rd 9 over Cheyenne River
Niobrara County, Wyoming · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- Ni Cnty Rd 9 over Cheyenne River in Niobrara County, Wyoming, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1920 and reconstructed in 1960, making it 105 years old at the 2025 inventory.
- It carries about 3 vehicles a day (traffic count year 2024).
- Its listed owner is the county highway agency.
- It is one of 1 of the 34 inventoried bridges in Niobrara County rated poor (2.9%); 1 (2.9%) are rated poor.
- Its traffic status in the 2025 inventory is posted for load (NBI item 41).
- Its class is unchanged from 2024 (poor), but component ratings moved: superstructure 5 to 4.
- Status change: newly posted for load since 2024.
- Its most recent inspection on record is dated November 2024, on a 12-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- It has fracture-critical members (NBI item 92A): steel tension members without a redundant load path, which get their own scheduled inspections.
- A poor rating means at least one major component - deck, superstructure, or substructure - is rated 4 or lower on FHWA's 0-9 scale. It does not by itself mean the bridge is unsafe; bridges judged unsafe are closed or load-restricted by their owners.
View this bridge on a map → (43.42108, -104.13183)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 4 | 4 | Poor condition |
| Superstructure | 5 | 4 | Poor condition |
| Substructure | 4 | 4 | Poor condition |
Bridge details
| Structure | Steel through truss |
| Length | about 132 ft |
| Location | 6 Mi. N.E.Of Mule Crk Jct |
| NBI structure number | DSD |
| Condition class | Poor |
| Traffic status (item 41) | Posted for load |
| Last inspection (item 90) | November 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
| Fracture critical (item 92A) | Yes |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Wyoming department of transportation.
Busiest bridges in Niobrara 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 |
All bridges nearby: Niobrara County, WY bridge conditions · every bridge in Niobrara County · Wyoming bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.