US Bridges

M-120 over Muskegon River

Fair

Muskegon County, Michigan · In Muskegon · Structure no. 000000000007611

Built
2001
24 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
278 ft
3 main spans
Daily traffic
27,282
2007 count
Owner
State
State Highway Agency

About this bridge

M-120 over Muskegon River is a prestressed concrete stringer/multi-beam or girder carrying M-120 over Muskegon River in Muskegon County, Michigan. It was built in 2001, so it is 24 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 5 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 27,282 vehicles a day, roughly 3% of them trucks, projected to reach 29,883 by 2018. The structure is 278 ft (84.6 m) long and 70 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesM-120
CrossesMuskegon River
LocationIn Muskegon
RouteState Highway 120
CountyMuskegon County
StateMichigan
Coordinates43.25426, -86.23569
Functional classUrban Other Principal 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating62.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 25 or greater
Structure length278 ft (84.6 m)
Longest span107 ft (32.6 m)
Deck width70 ft (21.3 m)
Roadway width67 ft (20.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,282 (2007)
Projected traffic29,883 by 2018
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-120 over Muskegon River built?

It was built in 2001, making it 24 years old in 2025.

What condition is M-120 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 July 2023.

How much traffic does M-120 over Muskegon River carry?

About 27,282 vehicles per day (2007 count), of which roughly 3% are trucks.

How long is M-120 over Muskegon River?

The structure is 278 ft (84.6 m) long with a longest span of 107 ft (32.6 m) and a deck 70 ft wide.

Who owns M-120 over Muskegon River?

It is owned by the State Highway Agency.