Mt 21 over Heppler Coulee 109
Fair Condition92 years old421 vehicles/day
Location
| State | Montana |
| County | Cascade |
| Location | 4m W Simms |
| Carries | Mt 21 |
| Crosses | Heppler Coulee 109 |
| Coordinates | 47.50034, -111.99864 |
Condition Ratings
| Overall Condition | Fair |
| Deck | 8 (Very Good) |
| Superstructure | 7 (Good) |
| 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 | 57.1 ft (17.4 m) |
| Max Span | 19.0 ft (5.8 m) |
| Deck Width | 26.9 ft (8.2 m) |
| Deck Area | 142.7 sq m |
| Main Spans | 3 |
| Year Built | 1934 (reconstructed 2020) |
Traffic
| Avg Daily Traffic | 421 (2023) |
| Truck Traffic | 3% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | October 2024 |
| Inspection Frequency | Every 24 months |
| Owner | State Highway Agency |
| Historical Significance | Bridge is not eligible for the National Register |
| Structure Number | L07561002+05001 |