US Bridges

Mackinac Trail over Munuscong River

Fair

Chippewa County, Michigan · 2.5 MI NE of Rudyard · Structure no. 000000000001628

Built
1933
92 years old
Condition
Fair
inspected June 2023
Type
Culvert
Concrete
Length
23 ft
2 main spans
Daily traffic
666
1986 count
Owner
County
County Highway Agency

About this bridge

Mackinac Trail over Munuscong River is a concrete culvert carrying Mackinac Trail over Munuscong River in Chippewa County, Michigan. It was built in 1933, so it is 92 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 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 666 vehicles a day, projected to reach 1,160 by 2019. The structure is 23 ft (7 m) long. If it were closed, the detour would be 1.9 mi (3 km).

CarriesMackinac Trail
CrossesMunuscong River
Location2.5 MI NE of Rudyard
RouteCounty Highway 1741
Coordinates46.2575, -84.5489
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 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
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating35.6 US tons
Inventory rating21.3 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length23 ft (7 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic666 (1986)
Projected traffic1,160 by 2019
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Mackinac Trail over Munuscong River built?

It was built in 1933, making it 92 years old in 2025.

What condition is Mackinac Trail over Munuscong 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 Mackinac Trail over Munuscong River carry?

About 666 vehicles per day (1986 count).

How long is Mackinac Trail over Munuscong River?

The structure is 23 ft (7 m) long with a longest span of 11 ft (3.3 m).

Who owns Mackinac Trail over Munuscong River?

It is owned by the County Highway Agency.