US Bridges

Gresham HWY over Thornapple River

Good

Eaton County, Michigan · 2 MI NW of Potterville · Structure no. 000000000002370

Built
1993
32 years old
Condition
Good
inspected May 2023
Type
Slab
Wood or Timber
Length
40 ft
2 main spans
Daily traffic
473
2012 count
Owner
County
County Highway Agency

About this bridge

Gresham HWY over Thornapple River is a wood or timber slab carrying Gresham HWY over Thornapple River in Eaton County, Michigan. It was built in 1993, so it is 32 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 473 vehicles a day, projected to reach 1,200 by 2013. The structure is 40 ft (12.2 m) long and 32 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesGresham HWY
CrossesThornapple River
Location2 MI NW of Potterville
RouteCounty Highway 0
CountyEaton County
StateMichigan
Coordinates42.64028, -84.76993
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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
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 evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating48.9 US tons
Inventory rating40 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span20 ft (6.1 m)
Deck width32 ft (9.7 m)
Roadway width30 ft (9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic473 (2012)
Projected traffic1,200 by 2013
Trucks0%
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 Gresham HWY over Thornapple River built?

It was built in 1993, making it 32 years old in 2025.

What condition is Gresham HWY 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 Gresham HWY over Thornapple River carry?

About 473 vehicles per day (2012 count).

How long is Gresham HWY over Thornapple River?

The structure is 40 ft (12.2 m) long with a longest span of 20 ft (6.1 m) and a deck 32 ft wide.

Who owns Gresham HWY over Thornapple River?

It is owned by the County Highway Agency.