US-31 SB over N Branch Pentwater River
PoorOceana County, Michigan · 1.5 MI East of Pentwater · Structure no. 000000000008336
- Built
- 1980
- 45 years old
- Condition
- Poor
- inspected April 2024
- Type
- Stringer/Multi-beam or Girder
- Steel Continuous
- Length
- 738 ft
- 4 main spans
- Daily traffic
- 4,413
- 2007 count
- Owner
- State
- State Highway Agency
About this bridge
US-31 SB over N Branch Pentwater River is a steel continuous stringer/multi-beam or girder carrying US-31 SB over N Branch Pentwater River in Oceana County, Michigan. It was built in 1980, 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 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 4,413 vehicles a day, roughly 10% of them trucks, projected to reach 5,796 by 2018. The structure is 738 ft (225 m) long and 46 ft wide. If it were closed, the detour would be 9.9 mi (16 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 | 7 Good | Some minor problems. |
| Channel and channel protection | 8 Very Good | No problems noted. |
Structure
Traffic and service
Ownership and planned work
Frequently asked questions
When was US-31 SB over N Branch Pentwater River built?
It was built in 1980, making it 45 years old in 2025.
What condition is US-31 SB over N Branch Pentwater 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 April 2024.
How much traffic does US-31 SB over N Branch Pentwater River carry?
About 4,413 vehicles per day (2007 count), of which roughly 10% are trucks.
How long is US-31 SB over N Branch Pentwater River?
The structure is 738 ft (225 m) long with a longest span of 246 ft (75 m) and a deck 46 ft wide.
Who owns US-31 SB over N Branch Pentwater River?
It is owned by the State Highway Agency.