US Bridges

Leaton Road over North Br Chippewa River

Fair

Isabella County, Michigan · At SE Cor Sec 6 T14N R3W · Structure no. 000000000004305

Built
1969
56 years old
Condition
Fair
inspected June 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
150 ft
3 main spans
Daily traffic
2,516
2002 count
Owner
County
County Highway Agency

About this bridge

Leaton Road over North Br Chippewa River is a prestressed concrete box beam or girders - multiple carrying Leaton Road over North Br Chippewa River in Isabella County, Michigan. It was built in 1969, so it is 56 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 5 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 2,516 vehicles a day, projected to reach 3,740 by 2022. The structure is 150 ft (45.7 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesLeaton Road
CrossesNorth Br Chippewa River
LocationAt SE Cor Sec 6 T14N R3W
RouteCounty Highway 3746
CountyIsabella County
StateMichigan
Coordinates43.62633, -84.70806
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59.5 US tons
Inventory rating35.6 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadH 20
Structure length150 ft (45.7 m)
Longest span50 ft (15.2 m)
Deck width33 ft (10.1 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,516 (2002)
Projected traffic3,740 by 2022
Trucks0%
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 Leaton Road over North Br Chippewa River built?

It was built in 1969, making it 56 years old in 2025.

What condition is Leaton Road over North 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 June 2024.

How much traffic does Leaton Road over North Br Chippewa River carry?

About 2,516 vehicles per day (2002 count).

How long is Leaton Road over North Br Chippewa River?

The structure is 150 ft (45.7 m) long with a longest span of 50 ft (15.2 m) and a deck 33 ft wide.

Who owns Leaton Road over North Br Chippewa River?

It is owned by the County Highway Agency.