US Bridges

M-65 over Au Sable River

Fair

Iosco County, Michigan · 4.5 MI S of Alcona Col · Structure no. 000000000013132

Built
2003
22 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
754 ft
6 main spans
Daily traffic
2,497
2007 count
Owner
State
State Highway Agency

About this bridge

M-65 over Au Sable River is a prestressed concrete stringer/multi-beam or girder carrying M-65 over Au Sable River in Iosco County, Michigan. It was built in 2003, so it is 22 years old, younger 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 2,497 vehicles a day, roughly 16% of them trucks, projected to reach 3,200 by 2023. The structure is 754 ft (229.8 m) long and 47 ft wide. If it were closed, the detour would be 49.7 mi (80 km).

Location

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CarriesM-65
CrossesAu Sable River
Location4.5 MI S of Alcona Col
RouteState Highway 65
CountyIosco County
StateMichigan
Coordinates44.45393, -83.67413
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.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating83.6 US tons
Inventory rating43.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHS 25 or greater
Structure length754 ft (229.8 m)
Longest span129 ft (39.2 m)
Deck width47 ft (14.4 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,497 (2007)
Projected traffic3,200 by 2023
Trucks16%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed49.7 mi (80 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-65 over Au Sable River built?

It was built in 2003, making it 22 years old in 2025.

What condition is M-65 over Au Sable 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 July 2023.

How much traffic does M-65 over Au Sable River carry?

About 2,497 vehicles per day (2007 count), of which roughly 16% are trucks.

How long is M-65 over Au Sable River?

The structure is 754 ft (229.8 m) long with a longest span of 129 ft (39.2 m) and a deck 47 ft wide.

Who owns M-65 over Au Sable River?

It is owned by the State Highway Agency.