M-13 over Cass River
PoorSaginaw County, Michigan · 3.3 MI S of M-46 · Structure no. 000000000009082
- Built
- 1964
- 61 years old
- Condition
- Poor
- inspected July 2024
- Type
- Stringer/Multi-beam or Girder
- Steel
- Length
- 390 ft
- 6 main spans
- Daily traffic
- 5,700
- 2015 count
- Owner
- State
- State Highway Agency
About this bridge
M-13 over Cass River is a steel stringer/multi-beam or girder carrying M-13 over Cass River in Saginaw County, Michigan. It was built in 1964, so it is 61 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.
It carries about 5,700 vehicles a day, roughly 6% of them trucks, projected to reach 6,300 by 2035. The structure is 390 ft (118.9 m) long and 37 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 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 | 5 Fair | All primary structural elements are sound but may have minor section loss, cracking, spalling or scour. |
| Substructure | 4 Poor | Advanced section loss, deterioration, spalling or scour. |
| Channel and channel protection | 6 Satisfactory | Structural elements show some minor deterioration. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was M-13 over Cass River built?
It was built in 1964, making it 61 years old in 2025.
What condition is M-13 over Cass River 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 July 2024.
How much traffic does M-13 over Cass River carry?
About 5,700 vehicles per day (2015 count), of which roughly 6% are trucks.
How long is M-13 over Cass River?
The structure is 390 ft (118.9 m) long with a longest span of 64 ft (19.6 m) and a deck 37 ft wide.
Who owns M-13 over Cass River?
It is owned by the State Highway Agency.