US 20 over Big Lost River
Good Condition49 years old2,700 vehicles/day
Location
| State | Idaho |
| County | Butte |
| Location | 16.4 E. Arco |
| Carries | US 20 |
| Crosses | Big Lost River |
| Coordinates | 43.54864, -113.00694 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 8 (Very Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 8 (Very Good) |
| Scour Critical | 8 — Stable, low risk |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Stringer/Multi-beam |
| Total Length | 61.0 ft (18.6 m) |
| Max Span | 58.1 ft (17.7 m) |
| Deck Width | 39.7 ft (12.1 m) |
| Deck Area | 225.1 sq m |
| Main Spans | 1 |
| Year Built | 1977 |
Traffic
| Avg Daily Traffic | 2,700 (2023) |
| Truck Traffic | 18% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 723 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Historical significance is not determined |
| Structure Number | 000000000013200 |