M-21 over CSX RR (abn)
PoorGenesee County, Michigan · In Flint · Structure no. 000000000002575
- Built
- 1918
- 107 years old, rebuilt 1964
- Condition
- Poor
- inspected October 2024
- Type
- Stringer/Multi-beam or Girder
- Prestressed Concrete
- Length
- 72 ft
- 3 main spans
- Daily traffic
- 15,341
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
M-21 over CSX RR (abn) is a prestressed concrete stringer/multi-beam or girder carrying M-21 over CSX RR (abn) in Genesee County, Michigan. It was built in 1918 and reconstructed in 1964, so it is 107 years old, older than the Michigan average of 48.3 years.
The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: open, would be posted or closed except for temporary shoring.
It carries about 15,341 vehicles a day, roughly 3% of them trucks, projected to reach 19,050 by 2018. The structure is 72 ft (21.8 m) long and 62 ft wide. If it were closed, the detour would be 1.2 mi (2 km).
Location
Open in Google MapsCondition and inspection
The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.
| Component | Rating | Meaning |
|---|---|---|
| Deck | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Superstructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Substructure | 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 M-21 over CSX RR (abn) built?
It was built in 1918, making it 107 years old in 2025. It was reconstructed in 1964.
What condition is M-21 over CSX RR (abn) in?
The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.
How much traffic does M-21 over CSX RR (abn) carry?
About 15,341 vehicles per day (2007 count), of which roughly 3% are trucks.
How long is M-21 over CSX RR (abn)?
The structure is 72 ft (21.8 m) long with a longest span of 32 ft (9.8 m) and a deck 62 ft wide.
Who owns M-21 over CSX RR (abn)?
It is owned by the State Highway Agency.