US Bridges

Briggs Road over Flat River

Fair

Montcalm County, Michigan · 0.25 MI E of Backus Road · Structure no. 000000000007517

Built
1984
41 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
58 ft
1 main span
Daily traffic
293
2003 count
Owner
County
County Highway Agency

About this bridge

Briggs Road over Flat River is a prestressed concrete box beam or girders - multiple carrying Briggs Road over Flat River in Montcalm County, Michigan. It was built in 1984, so it is 41 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 293 vehicles a day, projected to reach 393 by 2023. The structure is 58 ft (17.6 m) long and 34 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesBriggs Road
CrossesFlat River
Location0.25 MI E of Backus Road
RouteCounty Highway 0
CountyMontcalm County
StateMichigan
Coordinates43.32239, -85.21957
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.2 US tons
Inventory rating39.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length58 ft (17.6 m)
Longest span54 ft (16.4 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic293 (2003)
Projected traffic393 by 2023
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 Briggs Road over Flat River built?

It was built in 1984, making it 41 years old in 2025.

What condition is Briggs 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 April 2023.

How much traffic does Briggs Road over Flat River carry?

About 293 vehicles per day (2003 count).

How long is Briggs Road over Flat River?

The structure is 58 ft (17.6 m) long with a longest span of 54 ft (16.4 m) and a deck 34 ft wide.

Who owns Briggs Road over Flat River?

It is owned by the County Highway Agency.