S 21 over Dry Creek 122
Fair Condition91 years old260 vehicles/day
Location
| State | Montana |
| County | Lewis and Clark |
| Location | 12m W Simms |
| Carries | S 21 |
| Crosses | Dry Creek 122 |
| Coordinates | 47.49982, -112.17944 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 8 (Very Good) |
| Superstructure | 6 (Satisfactory) |
| Substructure | 6 (Satisfactory) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 5 — Stable for scour |
Physical Characteristics
| Material | Wood or Timber |
| Design | Stringer/Multi-beam |
| Total Length | 78.1 ft (23.8 m) |
| Max Span | 19.0 ft (5.8 m) |
| Deck Width | 26.9 ft (8.2 m) |
| Deck Area | 195.2 sq m |
| Main Spans | 4 |
| Year Built | 1935 (reconstructed 2020) |
Traffic
| Avg Daily Traffic | 260 (2023) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 923 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | L25400009+01001 |