Old Mil. Rr Grade over Slough Bridge
Poor Condition114 years old15 vehicles/day
Location
| State | Idaho |
| County | Shoshone |
| Location | 1.4n 3.1w Calder |
| Carries | Old Mil. Rr Grade |
| Crosses | Slough Bridge |
| Coordinates | 47.29733, -116.26203 |
Condition Ratings
| Overall Condition | Poor |
| Deck | 4 (Poor) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 4 (Poor) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 97.1 ft (29.6 m) |
| Max Span | 16.1 ft (4.9 m) |
| Deck Width | 13.8 ft (4.2 m) |
| Deck Area | 124.3 sq m |
| Main Spans | 6 |
| Year Built | 1912 (reconstructed 1991) |
Traffic
| Avg Daily Traffic | 15 (2023) |
| Truck Traffic | 1% |
| Lanes On Bridge | 1 |
Inspection & Ownership
| Last Inspection | 824 |
| Inspection Frequency | Every 12 months |
| Owner | County Highway Agency |
| Historical Significance | Historical significance is not determined |
| Structure Number | 000000000037080 |