US Bridges

M-20 over US-131 NB

Fair

Mecosta County, Michigan · 1.0 MI W of Big Rapids · Structure no. 000000000006737

Built
1981
44 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
163 ft
3 main spans
Daily traffic
15,942
2007 count
Owner
State
State Highway Agency

About this bridge

M-20 over US-131 NB is a steel stringer/multi-beam or girder carrying M-20 over US-131 NB in Mecosta County, Michigan. It was built in 1981, so it is 44 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 15,942 vehicles a day, roughly 4% of them trucks, projected to reach 18,269 by 2018. The structure is 163 ft (49.7 m) long and 96 ft wide.

Location

Open in Google Maps
CarriesM-20
CrossesUS-131 NB
Location1.0 MI W of Big Rapids
RouteState Highway 20
CountyMecosta County
StateMichigan
Coordinates43.68684, -85.52037
Functional classRural Minor Arterial

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.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82.5 US tons
Inventory rating49.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length163 ft (49.7 m)
Longest span92 ft (28 m)
Deck width96 ft (29.2 m)
Roadway width94 ft (28.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,942 (2007)
Projected traffic18,269 by 2018
Trucks4%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was M-20 over US-131 NB built?

It was built in 1981, making it 44 years old in 2025.

What condition is M-20 over US-131 NB 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 M-20 over US-131 NB carry?

About 15,942 vehicles per day (2007 count), of which roughly 4% are trucks.

How long is M-20 over US-131 NB?

The structure is 163 ft (49.7 m) long with a longest span of 92 ft (28 m) and a deck 96 ft wide.

Who owns M-20 over US-131 NB?

It is owned by the State Highway Agency.