US Bridges

Miller Road over Flat River

Fair

Montcalm County, Michigan · Intr of Hillis & Miller · Structure no. 000000000007497

Built
1978
47 years old
Condition
Fair
inspected April 2023
Type
Slab
Wood or Timber
Length
52 ft
2 main spans
Daily traffic
133
2014 count
Owner
County
County Highway Agency

About this bridge

Miller Road over Flat River is a wood or timber slab carrying Miller Road over Flat River in Montcalm County, Michigan. It was built in 1978, so it is 47 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 133 vehicles a day, roughly 2% of them trucks, projected to reach 147 by 2034. The structure is 52 ft (15.8 m) long and 32 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMiller Road
CrossesFlat River
LocationIntr of Hillis & Miller
RouteCounty Highway 0
CountyMontcalm County
StateMichigan
Coordinates43.32699, -85.17408
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating50.7 US tons
Inventory rating36 US tons

Structure

Structure typeSlab
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadHS 20 + Mod
Structure length52 ft (15.8 m)
Longest span25 ft (7.6 m)
Deck width32 ft (9.8 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic133 (2014)
Projected traffic147 by 2034
Trucks2%
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 Miller Road over Flat River built?

It was built in 1978, making it 47 years old in 2025.

What condition is Miller 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 Miller Road over Flat River carry?

About 133 vehicles per day (2014 count), of which roughly 2% are trucks.

How long is Miller Road over Flat River?

The structure is 52 ft (15.8 m) long with a longest span of 25 ft (7.6 m) and a deck 32 ft wide.

Who owns Miller Road over Flat River?

It is owned by the County Highway Agency.