US Bridges

Button RD over Flat River

Fair

Ionia County, Michigan · .5 MI East of Smyrna · Structure no. 000000000004040

Built
1982
43 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
98 ft
2 main spans
Daily traffic
1,357
2007 count
Owner
County
County Highway Agency

About this bridge

Button RD over Flat River is a prestressed concrete box beam or girders - multiple carrying Button RD over Flat River in Ionia County, Michigan. It was built in 1982, so it is 43 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 1,357 vehicles a day, roughly 5% of them trucks, projected to reach 1,579 by 2027. The structure is 98 ft (29.8 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesButton RD
CrossesFlat River
Location.5 MI East of Smyrna
RouteCounty Highway 0
CountyIonia County
StateMichigan
Coordinates43.05863, -85.2546
Functional classRural Minor Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating59.3 US tons
Inventory rating35.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20 + Mod
Structure length98 ft (29.8 m)
Longest span49 ft (14.9 m)
Deck width31 ft (9.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,357 (2007)
Projected traffic1,579 by 2027
Trucks5%
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 Button RD over Flat River built?

It was built in 1982, making it 43 years old in 2025.

What condition is Button RD 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 October 2023.

How much traffic does Button RD over Flat River carry?

About 1,357 vehicles per day (2007 count), of which roughly 5% are trucks.

How long is Button RD over Flat River?

The structure is 98 ft (29.8 m) long with a longest span of 49 ft (14.9 m) and a deck 31 ft wide.

Who owns Button RD over Flat River?

It is owned by the County Highway Agency.