US Bridges

Bunker Highway over Grand River

Fair

Eaton County, Michigan · 2.3 MI NE of Eaton Rapids · Structure no. 000000000002397

Built
1994
31 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
160 ft
3 main spans
Daily traffic
246
2014 count
Owner
County
County Highway Agency

About this bridge

Bunker Highway over Grand River is a prestressed concrete box beam or girders - multiple carrying Bunker Highway over Grand River in Eaton County, Michigan. It was built in 1994, so it is 31 years old, younger 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 246 vehicles a day, projected to reach 300 by 2012. The structure is 160 ft (48.7 m) long and 33 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesBunker Highway
CrossesGrand River
Location2.3 MI NE of Eaton Rapids
RouteCounty Highway 99
CountyEaton County
StateMichigan
Coordinates42.55304, -84.62169
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.7 US tons
Inventory rating57.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length160 ft (48.7 m)
Longest span68 ft (20.7 m)
Deck width33 ft (10 m)
Roadway width30 ft (9.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic246 (2014)
Projected traffic300 by 2012
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 Bunker Highway over Grand River built?

It was built in 1994, making it 31 years old in 2025.

What condition is Bunker Highway over Grand 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 2023.

How much traffic does Bunker Highway over Grand River carry?

About 246 vehicles per day (2014 count).

How long is Bunker Highway over Grand River?

The structure is 160 ft (48.7 m) long with a longest span of 68 ft (20.7 m) and a deck 33 ft wide.

Who owns Bunker Highway over Grand River?

It is owned by the County Highway Agency.