Castor Road over Big Salt River
FairMidland County, Michigan · 0.5 MI N of Walter RD · Structure no. 000000000006995
- Built
- 1980
- 45 years old, rebuilt 2019
- Condition
- Fair
- inspected August 2023
- Type
- Box Beam or Girders - Single or Spread
- Prestressed Concrete
- Length
- 159 ft
- 3 main spans
- Daily traffic
- 314
- 2016 count
- Owner
- County
- County Highway Agency
About this bridge
Castor Road over Big Salt River is a prestressed concrete box beam or girders - single or spread carrying Castor Road over Big Salt River in Midland County, Michigan. It was built in 1980 and reconstructed in 2019, so it is 45 years old, younger than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
It carries about 314 vehicles a day, roughly 40% of them trucks, projected to reach 361 by 2036. The structure is 159 ft (48.5 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was Castor Road over Big Salt River built?
It was built in 1980, making it 45 years old in 2025. It was reconstructed in 2019.
What condition is Castor Road over Big Salt River in?
The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in August 2023.
How much traffic does Castor Road over Big Salt River carry?
About 314 vehicles per day (2016 count), of which roughly 40% are trucks.
How long is Castor Road over Big Salt River?
The structure is 159 ft (48.5 m) long with a longest span of 53 ft (16.2 m) and a deck 31 ft wide.
Who owns Castor Road over Big Salt River?
It is owned by the County Highway Agency.