US Bridges

Winn Road over South Br Chippewa River

Good

Isabella County, Michigan · 0.7 M S NE Cor Sec 28 T14 · Structure no. 000000000004301

Built
2002
23 years old
Condition
Good
inspected July 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
125 ft
2 main spans
Daily traffic
3,408
2022 count
Owner
County
County Highway Agency

About this bridge

Winn Road over South Br Chippewa River is a prestressed concrete box beam or girders - single or spread carrying Winn Road over South Br Chippewa River in Isabella County, Michigan. It was built in 2002, so it is 23 years old, younger 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 3,408 vehicles a day, roughly 10% of them trucks, projected to reach 4,158 by 2042. The structure is 125 ft (38 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesWinn Road
CrossesSouth Br Chippewa River
Location0.7 M S NE Cor Sec 28 T14
RouteCounty Highway 3737
Coordinates43.57241, -84.90734
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 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 adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating63.7 US tons
Inventory rating38.3 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length125 ft (38 m)
Longest span62 ft (19 m)
Deck width42 ft (12.8 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,408 (2022)
Projected traffic4,158 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Winn Road over South Br Chippewa River built?

It was built in 2002, making it 23 years old in 2025.

What condition is Winn Road over South Br Chippewa 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 July 2024.

How much traffic does Winn Road over South Br Chippewa River carry?

About 3,408 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Winn Road over South Br Chippewa River?

The structure is 125 ft (38 m) long with a longest span of 62 ft (19 m) and a deck 42 ft wide.

Who owns Winn Road over South Br Chippewa River?

It is owned by the County Highway Agency.