M-21 over North Swargart Drain
PoorClinton County, Michigan · 3.2 MI E of Fowler · Structure no. 000000000001882
- Built
- 1977
- 48 years old
- Condition
- Poor
- inspected October 2024
- Type
- Box Beam or Girders - Multiple
- Prestressed Concrete
- Length
- 30 ft
- 1 main span
- Daily traffic
- 4,192
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
M-21 over North Swargart Drain is a prestressed concrete box beam or girders - multiple carrying M-21 over North Swargart Drain in Clinton County, Michigan. It was built in 1977, 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 poor condition with a lowest component rating of 3 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.
It carries about 4,192 vehicles a day, roughly 8% of them trucks, projected to reach 5,120 by 2018. The structure is 30 ft (9.2 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 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 | 3 Serious | Loss of section, deterioration, spalling or scour have seriously affected primary structural components. |
| Superstructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Substructure | 6 Satisfactory | Structural elements show some minor deterioration. |
| Channel and channel protection | 7 Good | Some minor problems. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M-21 over North Swargart Drain built?
It was built in 1977, making it 48 years old in 2025.
What condition is M-21 over North Swargart Drain 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 North Swargart Drain carry?
About 4,192 vehicles per day (2007 count), of which roughly 8% are trucks.
How long is M-21 over North Swargart Drain?
The structure is 30 ft (9.2 m) long with a longest span of 30 ft (9.2 m) and a deck 52 ft wide.
Who owns M-21 over North Swargart Drain?
It is owned by the State Highway Agency.