Colby Lake RD over Lookingglass River
Good Condition42 years old346 vehicles/day
Location
| State | Michigan |
| County | Shiawassee |
| Location | 2.2 Mi SE Of Laingsburg |
| Carries | Colby Lake RD |
| Crosses | Lookingglass River |
| Coordinates | 42.86686, -84.32467 |
Condition Ratings
| Overall Condition | Good |
| Deck | 7 (Good) |
| Superstructure | 7 (Good) |
| Substructure | 7 (Good) |
| Channel/Waterway | 7 (Good) |
| Scour Critical | 7 — Countermeasures installed |
Physical Characteristics
| Material | Prestressed Concrete |
| Design | Box Beam - Multiple |
| Total Length | 69.9 ft (21.3 m) |
| Max Span | 65.9 ft (20.1 m) |
| Deck Width | 31.2 ft (9.5 m) |
| Deck Area | 202.3 sq m |
| Main Spans | 1 |
| Year Built | 1984 |
Traffic
| Avg Daily Traffic | 346 (2005) |
| Truck Traffic | 5% |
| Lanes On Bridge | 2 |
Inspection & Ownership
| Last Inspection | 324 |
| Inspection Frequency | Every 24 months |
| Owner | County Highway Agency |
| Historical Significance | Historical significance is not determined |
| Structure Number | 000000000009862 |