US Bridges

M-66 over Wanadoga Creek

Fair

Barry County, Michigan · 3.0 MI S of Assyria · Structure no. 000000000000541

Built
1933
92 years old, rebuilt 1971
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
45 ft
1 main span
Daily traffic
2,200
2013 count
Owner
State
State Highway Agency

About this bridge

M-66 over Wanadoga Creek is a steel stringer/multi-beam or girder carrying M-66 over Wanadoga Creek in Barry County, Michigan. It was built in 1933 and reconstructed in 1971, 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 2,200 vehicles a day, roughly 6% of them trucks, projected to reach 3,380 by 2018. The structure is 45 ft (13.7 m) long and 51 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesM-66
CrossesWanadoga Creek
Location3.0 MI S of Assyria
RouteState Highway 66
CountyBarry County
StateMichigan
Coordinates42.42271, -85.1231
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
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 inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.2 US tons
Inventory rating37.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length45 ft (13.7 m)
Longest span45 ft (13.7 m)
Deck width51 ft (15.4 m)
Roadway width47 ft (14.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,200 (2013)
Projected traffic3,380 by 2018
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 1933, making it 92 years old in 2025. It was reconstructed in 1971.

What condition is M-66 over Wanadoga Creek 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 May 2024.

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

About 2,200 vehicles per day (2013 count), of which roughly 6% are trucks.

How long is M-66 over Wanadoga Creek?

The structure is 45 ft (13.7 m) long with a longest span of 45 ft (13.7 m) and a deck 51 ft wide.

Who owns M-66 over Wanadoga Creek?

It is owned by the State Highway Agency.