US Bridges

River Road over Flat River

Fair

Montcalm County, Michigan · 0.50 MI S of Fletcher RD · Structure no. 000000000007500

Built
1989
36 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
105 ft
2 main spans
Daily traffic
303
2022 count
Owner
County
County Highway Agency

About this bridge

River Road over Flat River is a prestressed concrete stringer/multi-beam or girder carrying River Road over Flat River in Montcalm County, Michigan. It was built in 1989, so it is 36 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 303 vehicles a day, projected to reach 366 by 2042. The structure is 105 ft (32 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesRiver Road
CrossesFlat River
Location0.50 MI S of Fletcher RD
RouteCounty Highway 0
CountyMontcalm County
StateMichigan
Coordinates43.15031, -85.25243
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 protection7 GoodSome minor problems.
Last inspectionMarch 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating81.5 US tons
Inventory rating48.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20 + Mod
Structure length105 ft (32 m)
Longest span52 ft (15.8 m)
Deck width32 ft (9.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic303 (2022)
Projected traffic366 by 2042
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 River Road over Flat River built?

It was built in 1989, making it 36 years old in 2025.

What condition is River Road over Flat 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 March 2023.

How much traffic does River Road over Flat River carry?

About 303 vehicles per day (2022 count).

How long is River Road over Flat River?

The structure is 105 ft (32 m) long with a longest span of 52 ft (15.8 m) and a deck 32 ft wide.

Who owns River Road over Flat River?

It is owned by the County Highway Agency.