US Bridges

M-20 over Muskegon River

Fair

Mecosta County, Michigan · In Big Rapids(maple St) · Structure no. 000000000006746

Built
1983
42 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
390 ft
3 main spans
Daily traffic
12,343
2007 count
Owner
State
State Highway Agency

About this bridge

M-20 over Muskegon River is a steel continuous stringer/multi-beam or girder carrying M-20 over Muskegon River in Mecosta County, Michigan. It was built in 1983, so it is 42 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 12,343 vehicles a day, roughly 2% of them trucks, projected to reach 20,621 by 2018. The structure is 390 ft (118.9 m) long and 67 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesM-20
CrossesMuskegon River
LocationIn Big Rapids(maple St)
RouteState Highway 20
CountyMecosta County
StateMichigan
Coordinates43.69887, -85.47605
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating75.4 US tons
Inventory rating45.3 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length390 ft (118.9 m)
Longest span150 ft (45.7 m)
Deck width67 ft (20.3 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,343 (2007)
Projected traffic20,621 by 2018
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-20 over Muskegon River built?

It was built in 1983, making it 42 years old in 2025.

What condition is M-20 over Muskegon 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 June 2023.

How much traffic does M-20 over Muskegon River carry?

About 12,343 vehicles per day (2007 count), of which roughly 2% are trucks.

How long is M-20 over Muskegon River?

The structure is 390 ft (118.9 m) long with a longest span of 150 ft (45.7 m) and a deck 67 ft wide.

Who owns M-20 over Muskegon River?

It is owned by the State Highway Agency.