Colby Lake RD over Lookingglass River
GoodPosted for loadShiawassee County, Michigan · 2.2 MI SE of Laingsburg · Structure no. 000000000009862
- Built
- 1984
- 41 years old
- Condition
- Good
- inspected March 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 70 ft
- 1 main span
- Daily traffic
- 346
- 2005 count
- Owner
- County
- County Highway Agency
About this bridge
Colby Lake RD over Lookingglass River is a prestressed concrete box beam or girders - multiple carrying Colby Lake RD over Lookingglass River in Shiawassee County, Michigan. It was built in 1984, so it is 41 years old, younger than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.
It carries about 346 vehicles a day, roughly 5% of them trucks, projected to reach 625 by 2025. The structure is 70 ft (21.3 m) long and 31 ft wide. If it were closed, the detour would be 6.8 mi (11 km).
Location
Open in Google MapsCondition and inspection
All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 7 Good | Some minor problems. |
| Superstructure | 7 Good | Some minor problems. |
| Substructure | 7 Good | Some minor problems. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Colby Lake RD over Lookingglass River built?
It was built in 1984, making it 41 years old in 2025.
What condition is Colby Lake RD over Lookingglass River in?
The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2024.
How much traffic does Colby Lake RD over Lookingglass River carry?
About 346 vehicles per day (2005 count), of which roughly 5% are trucks.
How long is Colby Lake RD over Lookingglass River?
The structure is 70 ft (21.3 m) long with a longest span of 66 ft (20.1 m) and a deck 31 ft wide.
Who owns Colby Lake RD over Lookingglass River?
It is owned by the County Highway Agency.