US Bridges

M-66|W Stoney Corn over N Br Clam River

Fair

Missaukee County, Michigan · 2.7 MI E of Mcbain · Structure no. 000000000007024

Built
1933
92 years old, rebuilt 1989
Condition
Fair
inspected August 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
27 ft
1 main span
Daily traffic
4,081
2019 count
Owner
State
State Highway Agency

About this bridge

M-66|W Stoney Corn over N Br Clam River is a prestressed concrete box beam or girders - multiple carrying M-66|W Stoney Corn over N Br Clam River in Missaukee County, Michigan. It was built in 1933 and reconstructed in 1989, 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 4,081 vehicles a day, roughly 12% of them trucks, projected to reach 4,693 by 2039. The structure is 27 ft (8.2 m) long and 45 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-66|W Stoney Corn
CrossesN Br Clam River
Location2.7 MI E of Mcbain
RouteState Highway 66
CountyMissaukee County
StateMichigan
Coordinates44.19352, -85.15861
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionAugust 2024
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 geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating70.3 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length27 ft (8.2 m)
Longest span26 ft (7.9 m)
Deck width45 ft (13.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,081 (2019)
Projected traffic4,693 by 2039
Trucks12%
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

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-66|W Stoney Corn over N Br Clam River built?

It was built in 1933, making it 92 years old in 2025. It was reconstructed in 1989.

What condition is M-66|W Stoney Corn over N Br Clam 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 August 2024.

How much traffic does M-66|W Stoney Corn over N Br Clam River carry?

About 4,081 vehicles per day (2019 count), of which roughly 12% are trucks.

How long is M-66|W Stoney Corn over N Br Clam River?

The structure is 27 ft (8.2 m) long with a longest span of 26 ft (7.9 m) and a deck 45 ft wide.

Who owns M-66|W Stoney Corn over N Br Clam River?

It is owned by the State Highway Agency.