IRR FT McDERMITT over Quinn Rvr
Humboldt County, Nevada · rated Poor in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- IRR FT McDERMITT over Quinn Rvr in Humboldt County, Nevada, is rated in poor condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the culvert, rated 4 (poor condition) on the 0-9 scale.
- It was built in 1976, making it 49 years old at the 2025 inventory.
- It carries about 55 vehicles a day (traffic count year 2017).
- Its listed owner is the county highway agency.
- It is one of 1 of the 54 inventoried bridges in Humboldt County rated poor (1.9%); 1 (1.9%) are rated poor.
- Its traffic status in the 2025 inventory is open, no restriction (NBI item 41).
- Its condition class and component ratings are unchanged from the 2024 inventory.
- Its most recent inspection on record is dated August 2024, on a 12-month routine inspection cycle.
- 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 → (41.9676, -117.62669)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Culvert | 4 | 4 | Poor condition |
Bridge details
| Structure | Steel culvert |
| Length | about 57 ft |
| Location | FT. McDERMITT INDIAN RES. |
| NBI structure number | M1660B |
| Condition class | Poor |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2024 |
| Inspection interval (item 91) | 12 months |
| Scour (item 113) | 4: foundations stable, field review says exposed foundations need protection |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Nevada department of transportation.
Busiest bridges in Humboldt County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| SR 787 Hansen St over Sprr | 1967 | 12,000 | Fair |
| Cross Road over I 80 | 1970 | 9,000 | Fair |
| US 95 over I 80 | 1976 | 7,050 | Good |
| US 95 over Humboldt Rvr | 1986 | 6,550 | Fair |
| US 95 over UPRR | 1999 | 6,550 | Fair |
| I 80 over McNITCH RD | 1970 | 5,200 | Fair |
All bridges nearby: Humboldt County, NV bridge conditions · every bridge in Humboldt County · Nevada bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.