US Bridges

M-66 over Pine Creek

Fair

Calhoun County, Michigan · 0.2 MI S of N Drive South · Structure no. 000000000001195

Built
1947
78 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete
Length
25 ft
2 main spans
Daily traffic
8,571
2007 count
Owner
State
State Highway Agency

About this bridge

M-66 over Pine Creek is a concrete culvert carrying M-66 over Pine Creek in Calhoun County, Michigan. It was built in 1947, so it is 78 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 6 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 8,571 vehicles a day, roughly 4% of them trucks, projected to reach 12,515 by 2018. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesM-66
CrossesPine Creek
Location0.2 MI S of N Drive South
RouteState Highway 66
CountyCalhoun County
StateMichigan
Coordinates42.1434, -85.20853
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,571 (2007)
Projected traffic12,515 by 2018
Trucks4%
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 Pine Creek built?

It was built in 1947, making it 78 years old in 2025.

What condition is M-66 over Pine 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 March 2023.

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

About 8,571 vehicles per day (2007 count), of which roughly 4% are trucks.

How long is M-66 over Pine Creek?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m).

Who owns M-66 over Pine Creek?

It is owned by the State Highway Agency.