IRR BIA 170 over Gilson Wash
Fair Condition56 years old7,500 vehicles/day
Location
| State | Arizona |
| County | Gila |
| Location | Route 170 In San Carlos |
| Carries | IRR BIA 170 |
| Crosses | Gilson Wash |
| Coordinates | 33.34836, -110.45225 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 6 (Satisfactory) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 6 (Satisfactory) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Concrete Continuous |
| Design | Slab |
| Total Length | 590.9 ft (180.1 m) |
| Max Span | 30.2 ft (9.2 m) |
| Deck Width | 38.1 ft (11.6 m) |
| Deck Area | 2089.2 sq m |
| Main Spans | 20 |
| Year Built | 1970 |
Traffic
| Avg Daily Traffic | 7,500 (2024) |
| Truck Traffic | 2% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 124 |
| Inspection Frequency | Every 24 months |
| Owner | Bureau of Indian Affairs |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | 0000H58616B1319 |