US Bridges

M-61 over Middle Br Muskegon River

Fair

Osceola County, Michigan · 5 MI SE of Marion · Structure no. 000000000008605

Built
1973
52 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
185 ft
3 main spans
Daily traffic
1,493
2007 count
Owner
State
State Highway Agency

About this bridge

M-61 over Middle Br Muskegon River is a steel stringer/multi-beam or girder carrying M-61 over Middle Br Muskegon River in Osceola County, Michigan. It was built in 1973, so it is 52 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 1,493 vehicles a day, roughly 10% of them trucks, projected to reach 1,926 by 2018. The structure is 185 ft (56.4 m) long and 50 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesM-61
CrossesMiddle Br Muskegon River
Location5 MI SE of Marion
RouteState Highway 61
CountyOsceola County
StateMichigan
Coordinates44.04475, -85.12453
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.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating88.6 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length185 ft (56.4 m)
Longest span69 ft (21 m)
Deck width50 ft (15.1 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,493 (2007)
Projected traffic1,926 by 2018
Trucks10%
Lanes on structure2
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 proposedDeck replacement with only incidental widening
Estimated improvement cost$57,000
NavigationNo navigation control on waterway

Frequently asked questions

When was M-61 over Middle Br Muskegon River built?

It was built in 1973, making it 52 years old in 2025.

What condition is M-61 over Middle Br 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-61 over Middle Br Muskegon River carry?

About 1,493 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is M-61 over Middle Br Muskegon River?

The structure is 185 ft (56.4 m) long with a longest span of 69 ft (21 m) and a deck 50 ft wide.

Who owns M-61 over Middle Br Muskegon River?

It is owned by the State Highway Agency.