US Bridges

M-121 EB over Macatawa River

Fair

Ottawa County, Michigan · 7.5 MI NE of US-31 · Structure no. 000000000008710

Built
1955
70 years old, rebuilt 2010
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
40 ft
1 main span
Daily traffic
12,800
2010 count
Owner
State
State Highway Agency

About this bridge

M-121 EB over Macatawa River is a steel stringer/multi-beam or girder carrying M-121 EB over Macatawa River in Ottawa County, Michigan. It was built in 1955 and reconstructed in 2010, so it is 70 years old, older 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 12,800 vehicles a day, roughly 10% of them trucks, projected to reach 17,200 by 2030. The structure is 40 ft (12.2 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesM-121 EB
CrossesMacatawa River
Location7.5 MI NE of US-31
RouteState Highway 121
CountyOttawa County
StateMichigan
Coordinates42.83508, -85.95104
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating80.7 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length40 ft (12.2 m)
Longest span38 ft (11.7 m)
Deck width50 ft (15.1 m)
Roadway width46 ft (14.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic12,800 (2010)
Projected traffic17,200 by 2030
Trucks10%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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-121 EB over Macatawa River built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2010.

What condition is M-121 EB over Macatawa 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 2024.

How much traffic does M-121 EB over Macatawa River carry?

About 12,800 vehicles per day (2010 count), of which roughly 10% are trucks.

How long is M-121 EB over Macatawa River?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.7 m) and a deck 50 ft wide.

Who owns M-121 EB over Macatawa River?

It is owned by the State Highway Agency.