US 191 NB over Niger Canyon
Greenlee County, Arizona · rated Fair in the 2025 National Bridge Inventory
United States Bridge Conditions2025 National Bridge Inventory, FHWACompiled
- US 191 NB over Niger Canyon in Greenlee County, Arizona, is rated in fair condition in the 2025 National Bridge Inventory (as of ).
- Its lowest-rated component is the deck, rated 5 (fair condition) on the 0-9 scale.
- It was built in 1942, making it 83 years old at the 2025 inventory.
- It carries about 5,190 vehicles a day (traffic count year 2022).
- Its listed owner is the state highway agency.
- It is one of 48 of the 91 inventoried bridges in Greenlee County rated fair (52.7%); 3 (3.3%) 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 2023, on a 24-month routine inspection cycle.
- It is coded scour critical (NBI item 113 = 3): scour critical: foundations unstable for the assessed or calculated scour.
- A fair rating means the lowest-rated major component scores 5 or 6 on FHWA's 0-9 scale: some deterioration or minor section loss, but the structure is sound. It is the middle class, not a warning.
View this bridge on a map → (32.98291, -109.25974)
Component ratings
| Component | Rating (2024) | Rating (2025) | FHWA scale meaning |
|---|---|---|---|
| Deck | 5 | 5 | Fair condition |
| Superstructure | 5 | 5 | Fair condition |
| Substructure | 6 | 6 | Satisfactory condition |
Bridge details
| Structure | Continuous concrete slab |
| Length | about 109 ft |
| Location | 3.2 mi N Jct SR 75 |
| NBI structure number | 00267 |
| Condition class | Fair |
| Traffic status (item 41) | Open, no restriction |
| Last inspection (item 90) | August 2023 |
| Inspection interval (item 91) | 24 months |
| Scour (item 113) | 3: scour critical: foundations unstable for the assessed or calculated scour |
Source: FHWA National Bridge Inventory, 2025 data as reported by the Arizona department of transportation.
Busiest bridges in Greenlee County
| Bridge | Built | Vehicles/day | Condition |
|---|---|---|---|
| US 191 over San Francisco River | 2012 | 8,042 | Good |
| US 191 over Chase Creek No 1 | 1948 | 7,602 | Fair |
| US 191 over Ward Canyon | 2002 | 7,602 | Good |
| US 191 over Railroad | 2003 | 7,602 | Good |
| US 191 SB over Rattlesnake Canyon | 1942 | 5,190 | Fair |
| US 191 NB over Cold Creek | 1982 | 5,190 | Fair |
All bridges nearby: Greenlee County, AZ bridge conditions · every bridge in Greenlee County · Arizona bridges.
Background: how bridge ratings work · what "poor" and "structurally deficient" actually mean · how often bridges are inspected.