US Bridges

Mulliken Road over Thornapple River

Good

Eaton County, Michigan · 6.5 MI S of Mulliken · Structure no. 000000000002353

Built
1991
34 years old
Condition
Good
inspected May 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
96 ft
2 main spans
Daily traffic
808
2011 count
Owner
County
County Highway Agency

About this bridge

Mulliken Road over Thornapple River is a prestressed concrete continuous box beam or girders - multiple carrying Mulliken Road over Thornapple River in Eaton County, Michigan. It was built in 1991, so it is 34 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 808 vehicles a day, projected to reach 1,110 by 2013. The structure is 96 ft (29.2 m) long and 36 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesMulliken Road
CrossesThornapple River
Location6.5 MI S of Mulliken
RouteCounty Highway 2339
CountyEaton County
StateMichigan
Coordinates42.67169, -84.89579
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65.4 US tons
Inventory rating30 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length96 ft (29.2 m)
Longest span45 ft (13.7 m)
Deck width36 ft (11.1 m)
Roadway width33 ft (10 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic808 (2011)
Projected traffic1,110 by 2013
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Mulliken Road over Thornapple River built?

It was built in 1991, making it 34 years old in 2025.

What condition is Mulliken Road over Thornapple 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 Mulliken Road over Thornapple River carry?

About 808 vehicles per day (2011 count).

How long is Mulliken Road over Thornapple River?

The structure is 96 ft (29.2 m) long with a longest span of 45 ft (13.7 m) and a deck 36 ft wide.

Who owns Mulliken Road over Thornapple River?

It is owned by the County Highway Agency.