US Bridges

Bridge ST over Flat River

Good

Ionia County, Michigan · In Belding · Structure no. 000000000004097

Built
2005
20 years old
Condition
Good
inspected October 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
150 ft
2 main spans
Daily traffic
4,777
2005 count
Owner
City
City or Municipal Highway Agency

About this bridge

Bridge ST over Flat River is a prestressed concrete box beam or girders - single or spread carrying Bridge ST over Flat River in Ionia County, Michigan. It was built in 2005, so it is 20 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 4,777 vehicles a day, roughly 3% of them trucks, projected to reach 5,123 by 2023. The structure is 150 ft (45.7 m) long and 45 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesBridge ST
CrossesFlat River
LocationIn Belding
RouteCity Street 2070
Coordinates43.1003, -85.22814
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 evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.9 US tons
Inventory rating22.2 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length150 ft (45.7 m)
Longest span72 ft (21.9 m)
Deck width45 ft (13.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,777 (2005)
Projected traffic5,123 by 2023
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 Bridge ST over Flat River built?

It was built in 2005, making it 20 years old in 2025.

What condition is Bridge 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 Bridge ST over Flat River carry?

About 4,777 vehicles per day (2005 count), of which roughly 3% are trucks.

How long is Bridge ST over Flat River?

The structure is 150 ft (45.7 m) long with a longest span of 72 ft (21.9 m) and a deck 45 ft wide.

Who owns Bridge ST over Flat River?

It is owned by the City or Municipal Highway Agency.