US Bridges

Bennington Road over Shiawassee River

Poor

Shiawassee County, Michigan · 2.5 MI W of Vernon · Structure no. 000000000009791

Built
1985
40 years old
Condition
Poor
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
145 ft
2 main spans
Daily traffic
1,096
2011 count
Owner
County
County Highway Agency

About this bridge

Bennington Road over Shiawassee River is a prestressed concrete box beam or girders - multiple carrying Bennington Road over Shiawassee River in Shiawassee County, Michigan. It was built in 1985, so it is 40 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,096 vehicles a day, roughly 10% of them trucks, projected to reach 1,980 by 2031. The structure is 145 ft (44.2 m) long and 37 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

CarriesBennington Road
CrossesShiawassee River
Location2.5 MI W of Vernon
RouteCounty Highway 7644
Coordinates42.93046, -84.07397
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating89 US tons
Inventory rating53.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20
Structure length145 ft (44.2 m)
Longest span69 ft (21 m)
Deck width37 ft (11.4 m)
Roadway width36 ft (11 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,096 (2011)
Projected traffic1,980 by 2031
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 Bennington Road over Shiawassee River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Bennington Road over Shiawassee River in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in May 2024.

How much traffic does Bennington Road over Shiawassee River carry?

About 1,096 vehicles per day (2011 count), of which roughly 10% are trucks.

How long is Bennington Road over Shiawassee River?

The structure is 145 ft (44.2 m) long with a longest span of 69 ft (21 m) and a deck 37 ft wide.

Who owns Bennington Road over Shiawassee River?

It is owned by the County Highway Agency.