US Bridges

I-75BL|M-72|N Jame over Au Sable River

Fair

Crawford County, Michigan · In Grayling · Structure no. 000000000002031

Built
1935
90 years old
Condition
Fair
inspected May 2023
Type
Frame
Steel
Length
40 ft
1 main span
Daily traffic
13,375
2015 count
Owner
State
State Highway Agency

About this bridge

I-75BL|M-72|N Jame over Au Sable River is a steel frame carrying I-75BL|M-72|N Jame over Au Sable River in Crawford County, Michigan. It was built in 1935, so it is 90 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 13,375 vehicles a day, roughly 4% of them trucks, projected to reach 14,775 by 2035. The structure is 40 ft (12.2 m) long and 55 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesI-75BL|M-72|N Jame
CrossesAu Sable River
LocationIn Grayling
RouteInterstate 75
CountyCrawford County
StateMichigan
Coordinates44.65968, -84.7123
Functional classRural Principal Arterial - Other

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating75.4 US tons
Inventory rating45.3 US tons

Structure

Structure typeFrame
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 15
Structure length40 ft (12.2 m)
Longest span39 ft (11.9 m)
Deck width55 ft (16.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,375 (2015)
Projected traffic14,775 by 2035
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was I-75BL|M-72|N Jame over Au Sable River built?

It was built in 1935, making it 90 years old in 2025.

What condition is I-75BL|M-72|N Jame 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 May 2023.

How much traffic does I-75BL|M-72|N Jame over Au Sable River carry?

About 13,375 vehicles per day (2015 count), of which roughly 4% are trucks.

How long is I-75BL|M-72|N Jame over Au Sable River?

The structure is 40 ft (12.2 m) long with a longest span of 39 ft (11.9 m) and a deck 55 ft wide.

Who owns I-75BL|M-72|N Jame over Au Sable River?

It is owned by the State Highway Agency.