US Bridges

Route 566 over Big Cedar River

Good

Menominee County, Michigan · In Spalding · Structure no. 000000000006832

Built
1985
40 years old
Condition
Good
inspected June 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
57 ft
1 main span
Daily traffic
150
Owner
County
County Highway Agency

About this bridge

Route 566 over Big Cedar River is a prestressed concrete box beam or girders - multiple carrying Route 566 over Big Cedar River in Menominee County, Michigan. It was built in 1985, so it is 40 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 150 vehicles a day, projected to reach 185 by 2019. The structure is 57 ft (17.3 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesRoute 566
CrossesBig Cedar River
LocationIn Spalding
RouteCounty Highway 5557
Coordinates45.6929, -87.51099
Functional classRural Major Collector

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating47.8 US tons
Inventory rating36 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length57 ft (17.3 m)
Longest span57 ft (17.3 m)
Deck width31 ft (9.5 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (—)
Projected traffic185 by 2019
Trucks0%
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

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 Route 566 over Big Cedar River built?

It was built in 1985, making it 40 years old in 2025.

What condition is Route 566 over Big Cedar River 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 June 2023.

How much traffic does Route 566 over Big Cedar River carry?

About 150 vehicles per day (latest count).

How long is Route 566 over Big Cedar River?

The structure is 57 ft (17.3 m) long with a longest span of 57 ft (17.3 m) and a deck 31 ft wide.

Who owns Route 566 over Big Cedar River?

It is owned by the County Highway Agency.