US Bridges

M-66 over West Branch R (coyle Cr)

Good

Osceola County, Michigan · 0.1 MI N of M-115 · Structure no. 000000000008592

Built
1940
85 years old, rebuilt 2015
Condition
Good
inspected August 2024
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
23 ft
1 main span
Daily traffic
1,864
2014 count
Owner
State
State Highway Agency

About this bridge

M-66 over West Branch R (coyle Cr) is a prestressed concrete box beam or girders - single or spread carrying M-66 over West Branch R (coyle Cr) in Osceola County, Michigan. It was built in 1940 and reconstructed in 2015, so it is 85 years old, older 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 1,864 vehicles a day, roughly 13% of them trucks, projected to reach 2,144 by 2034. The structure is 23 ft (7.1 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesM-66
CrossesWest Branch R (coyle Cr)
Location0.1 MI N of M-115
RouteState Highway 66
CountyOsceola County
StateMichigan
Coordinates44.03324, -85.14778
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating87.5 US tons
Inventory rating67.5 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadGreater than HL 93
Structure length23 ft (7.1 m)
Longest span21 ft (6.4 m)
Deck width43 ft (13.2 m)
Roadway width40 ft (12.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,864 (2014)
Projected traffic2,144 by 2034
Trucks13%
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

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 West Branch R (coyle Cr) built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2015.

What condition is M-66 over West Branch R (coyle Cr) 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 August 2024.

How much traffic does M-66 over West Branch R (coyle Cr) carry?

About 1,864 vehicles per day (2014 count), of which roughly 13% are trucks.

How long is M-66 over West Branch R (coyle Cr)?

The structure is 23 ft (7.1 m) long with a longest span of 21 ft (6.4 m) and a deck 43 ft wide.

Who owns M-66 over West Branch R (coyle Cr)?

It is owned by the State Highway Agency.