US Bridges

River Road over South Br Chippewa River

Fair

Isabella County, Michigan · 0.7 M W SE Cor Sec 6 T14N · Structure no. 000000000004278

Built
1964
61 years old
Condition
Fair
inspected July 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
90 ft
3 main spans
Daily traffic
2,070
2002 count
Owner
County
County Highway Agency

About this bridge

River Road over South Br Chippewa River is a prestressed concrete box beam or girders - multiple carrying River Road over South Br Chippewa River in Isabella 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 fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 2,070 vehicles a day, projected to reach 3,080 by 2022. The structure is 90 ft (27.4 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesRiver Road
CrossesSouth Br Chippewa River
Location0.7 M W SE Cor Sec 6 T14N
RouteCounty Highway 3744
CountyIsabella County
StateMichigan
Coordinates43.62513, -84.96262
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
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 evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.4 US tons
Inventory rating49.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadH 20
Structure length90 ft (27.4 m)
Longest span50 ft (15.2 m)
Deck width30 ft (9.2 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,070 (2002)
Projected traffic3,080 by 2022
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 River Road over South Br Chippewa River built?

It was built in 1964, making it 61 years old in 2025.

What condition is River Road over South Br Chippewa River in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2024.

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

About 2,070 vehicles per day (2002 count).

How long is River Road over South Br Chippewa River?

The structure is 90 ft (27.4 m) long with a longest span of 50 ft (15.2 m) and a deck 30 ft wide.

Who owns River Road over South Br Chippewa River?

It is owned by the County Highway Agency.