US Bridges

M-66 over Wanadoga Creek

Good

Calhoun County, Michigan · 3.2 MI SW of Barry Col · Structure no. 000000000001198

Built
2012
13 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
66 ft
1 main span
Daily traffic
8,121
2011 count
Owner
State
State Highway Agency

About this bridge

M-66 over Wanadoga Creek is a prestressed concrete box beam or girders - single or spread carrying M-66 over Wanadoga Creek in Calhoun County, Michigan. It was built in 2012, so it is 13 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 8,121 vehicles a day, roughly 5% of them trucks, projected to reach 8,108 by 2031. The structure is 66 ft (20.1 m) long and 47 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesM-66
CrossesWanadoga Creek
Location3.2 MI SW of Barry Col
RouteState Highway 66
CountyCalhoun County
StateMichigan
Coordinates42.39649, -85.13135
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.1 US tons
Inventory rating42.1 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length66 ft (20.1 m)
Longest span63 ft (19.2 m)
Deck width47 ft (14.2 m)
Roadway width44 ft (13.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,121 (2011)
Projected traffic8,108 by 2031
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 over Wanadoga Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is M-66 over Wanadoga Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does M-66 over Wanadoga Creek carry?

About 8,121 vehicles per day (2011 count), of which roughly 5% are trucks.

How long is M-66 over Wanadoga Creek?

The structure is 66 ft (20.1 m) long with a longest span of 63 ft (19.2 m) and a deck 47 ft wide.

Who owns M-66 over Wanadoga Creek?

It is owned by the State Highway Agency.