US Bridges

Main ST over Flat River

Good

Ionia County, Michigan · In Belding · Structure no. 000000000004096

Built
2014
11 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
140 ft
2 main spans
Daily traffic
748
2014 count
Owner
City
City or Municipal Highway Agency

About this bridge

Main ST over Flat River is a prestressed concrete box beam or girders - single or spread carrying Main ST over Flat River in Ionia County, Michigan. It was built in 2014, so it is 11 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 748 vehicles a day, roughly 2% of them trucks, projected to reach 913 by 2034. The structure is 140 ft (42.7 m) long and 46 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMain ST
CrossesFlat River
LocationIn Belding
RouteCity Street 2070
CountyIonia County
StateMichigan
Coordinates43.09785, -85.23464
Functional classUrban Minor Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating53.9 US tons
Inventory rating42.5 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadGreater than HL 93
Structure length140 ft (42.7 m)
Longest span68 ft (20.6 m)
Deck width46 ft (14.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic748 (2014)
Projected traffic913 by 2034
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Main ST over Flat River built?

It was built in 2014, making it 11 years old in 2025.

What condition is Main ST over Flat 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 October 2024.

How much traffic does Main ST over Flat River carry?

About 748 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is Main ST over Flat River?

The structure is 140 ft (42.7 m) long with a longest span of 68 ft (20.6 m) and a deck 46 ft wide.

Who owns Main ST over Flat River?

It is owned by the City or Municipal Highway Agency.