US Bridges

Summerton Road over Little Salt River

Good

Isabella County, Michigan · 0.5 MI S of Coe RD · Structure no. 000000000013159

Built
2007
18 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
45 ft
1 main span
Daily traffic
45
2005 count
Owner
County
County Highway Agency

About this bridge

Summerton Road over Little Salt River is a prestressed concrete box beam or girders - multiple carrying Summerton Road over Little Salt River in Isabella County, Michigan. It was built in 2007, so it is 18 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 45 vehicles a day, projected to reach 87 by 2027. The structure is 45 ft (13.7 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesSummerton Road
CrossesLittle Salt River
Location0.5 MI S of Coe RD
RouteCounty Highway 0
Coordinates43.47353, -84.72682
Functional classRural Local

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.
Substructure8 Very GoodNo problems noted.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation8: Equal to present desirable criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating87.7 US tons
Inventory rating52.6 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span41 ft (12.5 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic45 (2005)
Projected traffic87 by 2027
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 Summerton Road over Little Salt River built?

It was built in 2007, making it 18 years old in 2025.

What condition is Summerton Road over Little Salt 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 May 2023.

How much traffic does Summerton Road over Little Salt River carry?

About 45 vehicles per day (2005 count).

How long is Summerton Road over Little Salt River?

The structure is 45 ft (13.7 m) long with a longest span of 41 ft (12.5 m) and a deck 34 ft wide.

Who owns Summerton Road over Little Salt River?

It is owned by the County Highway Agency.