US Bridges

US-131 SB over M-20 (8 Mile Road)

Fair

Mecosta County, Michigan · West of Stanwood · Structure no. 000000000006715

Built
1979
46 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
135 ft
1 main span
Daily traffic
10,938
2007 count
Owner
State
State Highway Agency

About this bridge

US-131 SB over M-20 (8 Mile Road) is a steel stringer/multi-beam or girder carrying US-131 SB over M-20 (8 Mile Road) in Mecosta County, Michigan. It was built in 1979, so it is 46 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 10,938 vehicles a day, roughly 13% of them trucks, projected to reach 11,010 by 2018. The structure is 135 ft (41.1 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesUS-131 SB
CrossesM-20 (8 Mile Road)
LocationWest of Stanwood
RouteU.S. Route 131
CountyMecosta County
StateMichigan
Coordinates43.58362, -85.4896
Functional classRural Principal Arterial - Other

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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating101.1 US tons
Inventory rating60.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length135 ft (41.1 m)
Longest span135 ft (41.1 m)
Deck width46 ft (13.9 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,938 (2007)
Projected traffic11,010 by 2018
Trucks13%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$86,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was US-131 SB over M-20 (8 Mile Road) built?

It was built in 1979, making it 46 years old in 2025.

What condition is US-131 SB over M-20 (8 Mile Road) 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 June 2023.

How much traffic does US-131 SB over M-20 (8 Mile Road) carry?

About 10,938 vehicles per day (2007 count), of which roughly 13% are trucks.

How long is US-131 SB over M-20 (8 Mile Road)?

The structure is 135 ft (41.1 m) long with a longest span of 135 ft (41.1 m) and a deck 46 ft wide.

Who owns US-131 SB over M-20 (8 Mile Road)?

It is owned by the State Highway Agency.