US Bridges

M-25 over Pigeon River

Good

Huron County, Michigan · In Caseville · Structure no. 000000000003449

Built
1929
96 years old, rebuilt 2006
Condition
Good
inspected April 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
101 ft
1 main span
Daily traffic
4,865
2007 count
Owner
State
State Highway Agency

About this bridge

M-25 over Pigeon River is a prestressed concrete box beam or girders - single or spread carrying M-25 over Pigeon River in Huron County, Michigan. It was built in 1929 and reconstructed in 2006, so it is 96 years old, older 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 4,865 vehicles a day, roughly 6% of them trucks, projected to reach 5,800 by 2027. The structure is 101 ft (30.8 m) long and 55 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesM-25
CrossesPigeon River
LocationIn Caseville
RouteState Highway 25
Coordinates43.94378, -83.27291
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89.6 US tons
Inventory rating53.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length101 ft (30.8 m)
Longest span98 ft (29.8 m)
Deck width55 ft (16.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,865 (2007)
Projected traffic5,800 by 2027
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNavigation control on waterway (bridge permit required)

Frequently asked questions

When was M-25 over Pigeon River built?

It was built in 1929, making it 96 years old in 2025. It was reconstructed in 2006.

What condition is M-25 over Pigeon River 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 April 2024.

How much traffic does M-25 over Pigeon River carry?

About 4,865 vehicles per day (2007 count), of which roughly 6% are trucks.

How long is M-25 over Pigeon River?

The structure is 101 ft (30.8 m) long with a longest span of 98 ft (29.8 m) and a deck 55 ft wide.

Who owns M-25 over Pigeon River?

It is owned by the State Highway Agency.