M-21 over Grand Rapids Eastern RR
GoodKent County, Michigan · 3.5 MI W of Ada · Structure no. 000000000004858
- Built
- 1977
- 48 years old, rebuilt 2015
- Condition
- Good
- inspected November 2023
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 225 ft
- 3 main spans
- Daily traffic
- 29,250
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
M-21 over Grand Rapids Eastern RR is a prestressed concrete stringer/multi-beam or girder carrying M-21 over Grand Rapids Eastern RR in Kent County, Michigan. It was built in 1977 and reconstructed in 2015, so it is 48 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.
It carries about 29,250 vehicles a day, roughly 4% of them trucks, projected to reach 34,000 by 2035. The structure is 225 ft (68.5 m) long and 91 ft wide. If it were closed, the detour would be 1.2 mi (2 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 | 8 Very Good | No problems noted. |
| Superstructure | 8 Very Good | No problems noted. |
| Substructure | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M-21 over Grand Rapids Eastern RR built?
It was built in 1977, making it 48 years old in 2025. It was reconstructed in 2015.
What condition is M-21 over Grand Rapids Eastern RR 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 November 2023.
How much traffic does M-21 over Grand Rapids Eastern RR carry?
About 29,250 vehicles per day (2015 count), of which roughly 4% are trucks.
How long is M-21 over Grand Rapids Eastern RR?
The structure is 225 ft (68.5 m) long with a longest span of 75 ft (22.9 m) and a deck 91 ft wide.
Who owns M-21 over Grand Rapids Eastern RR?
It is owned by the State Highway Agency.