US Bridges

Smithville Road over Grand River

Fair

Eaton County, Michigan · 1 M E of Eaton Rapids · Structure no. 000000000002403

Built
1980
45 years old
Condition
Fair
inspected December 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
178 ft
3 main spans
Daily traffic
350
2023 count
Owner
County
County Highway Agency

About this bridge

Smithville Road over Grand River is a prestressed concrete box beam or girders - multiple carrying Smithville Road over Grand River in Eaton County, Michigan. It was built in 1980, so it is 45 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 350 vehicles a day, roughly 2% of them trucks, projected to reach 387 by 2043. The structure is 178 ft (54.3 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSmithville Road
CrossesGrand River
Location1 M E of Eaton Rapids
RouteCounty Highway 0
CountyEaton County
StateMichigan
Coordinates42.49946, -84.63056
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation*: *
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating—
Inventory rating—

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans3
Design loadHS 20
Structure length178 ft (54.3 m)
Longest span58 ft (17.7 m)
Deck width34 ft (10.5 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic350 (2023)
Projected traffic387 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Smithville Road over Grand River built?

It was built in 1980, making it 45 years old in 2025.

What condition is Smithville Road 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 December 2024.

How much traffic does Smithville Road over Grand River carry?

About 350 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Smithville Road over Grand River?

The structure is 178 ft (54.3 m) long with a longest span of 58 ft (17.7 m) and a deck 34 ft wide.

Who owns Smithville Road over Grand River?

It is owned by the County Highway Agency.