US Bridges

M-66 over N Br Chippewa River

Fair

Mecosta County, Michigan · In Barryton · Structure no. 000000000006754

Built
1927
98 years old, rebuilt 1999
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
80 ft
2 main spans
Daily traffic
2,357
2007 count
Owner
State
State Highway Agency

About this bridge

M-66 over N Br Chippewa River is a steel stringer/multi-beam or girder carrying M-66 over N Br Chippewa River in Mecosta County, Michigan. It was built in 1927 and reconstructed in 1999, so it is 98 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 2,357 vehicles a day, roughly 9% of them trucks, projected to reach 3,492 by 2018. The structure is 80 ft (24.5 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-66
CrossesN Br Chippewa River
LocationIn Barryton
RouteState Highway 66
CountyMecosta County
StateMichigan
Coordinates43.75367, -85.14761
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating94.7 US tons
Inventory rating56.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadHS 25 or greater
Structure length80 ft (24.5 m)
Longest span40 ft (12.3 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,357 (2007)
Projected traffic3,492 by 2018
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 N Br Chippewa River built?

It was built in 1927, making it 98 years old in 2025. It was reconstructed in 1999.

What condition is M-66 over N Br Chippewa River 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 August 2024.

How much traffic does M-66 over N Br Chippewa River carry?

About 2,357 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is M-66 over N Br Chippewa River?

The structure is 80 ft (24.5 m) long with a longest span of 40 ft (12.3 m) and a deck 37 ft wide.

Who owns M-66 over N Br Chippewa River?

It is owned by the State Highway Agency.