US Bridges

M-65 over Au Gres River

Fair

Iosco County, Michigan · 1.0 MI S of M-55 · Structure no. 000000000004112

Built
1951
74 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
134 ft
3 main spans
Daily traffic
3,354
2007 count
Owner
State
State Highway Agency

About this bridge

M-65 over Au Gres River is a steel continuous stringer/multi-beam or girder carrying M-65 over Au Gres River in Iosco County, Michigan. It was built in 1951, so it is 74 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 5 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 3,354 vehicles a day, roughly 7% of them trucks, projected to reach 4,669 by 2018. The structure is 134 ft (40.8 m) long and 33 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesM-65
CrossesAu Gres River
Location1.0 MI S of M-55
RouteState Highway 65
CountyIosco County
StateMichigan
Coordinates44.2627, -83.80317
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.3 US tons
Inventory rating46.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length134 ft (40.8 m)
Longest span53 ft (16.2 m)
Deck width33 ft (10.1 m)
Roadway width28 ft (8.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,354 (2007)
Projected traffic4,669 by 2018
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 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 Gres River built?

It was built in 1951, making it 74 years old in 2025.

What condition is M-65 over Au Gres 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 Gres River carry?

About 3,354 vehicles per day (2007 count), of which roughly 7% are trucks.

How long is M-65 over Au Gres River?

The structure is 134 ft (40.8 m) long with a longest span of 53 ft (16.2 m) and a deck 33 ft wide.

Who owns M-65 over Au Gres River?

It is owned by the State Highway Agency.