US Bridges

Center Road over Thornapple River

Fair

Barry County, Michigan · 0.6 MI W of Powell Road · Structure no. 000000000000569

Built
1969
56 years old
Condition
Fair
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
122 ft
2 main spans
Daily traffic
518
2018 count
Owner
County
County Highway Agency

About this bridge

Center Road over Thornapple River is a prestressed concrete box beam or girders - multiple carrying Center Road over Thornapple River in Barry 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 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 518 vehicles a day, roughly 2% of them trucks, projected to reach 632 by 2038. The structure is 122 ft (37.1 m) long and 33 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCenter Road
CrossesThornapple River
Location0.6 MI W of Powell Road
RouteCounty Highway 0
CountyBarry County
StateMichigan
Coordinates42.63923, -85.26229
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating71.8 US tons
Inventory rating42.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20 + Mod
Structure length122 ft (37.1 m)
Longest span61 ft (18.5 m)
Deck width33 ft (10.2 m)
Roadway width31 ft (9.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic518 (2018)
Projected traffic632 by 2038
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Center Road over Thornapple River built?

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

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

About 518 vehicles per day (2018 count), of which roughly 2% are trucks.

How long is Center Road over Thornapple River?

The structure is 122 ft (37.1 m) long with a longest span of 61 ft (18.5 m) and a deck 33 ft wide.

Who owns Center Road over Thornapple River?

It is owned by the County Highway Agency.