US Bridges

I-75 Bs (ashmun) over Power Canal

Fair

Chippewa County, Michigan · In Sault Ste Marie · Structure no. 000000000001570

Built
1934
91 years old, rebuilt 1998
Condition
Fair
inspected August 2024
Type
Arch - Thru
Steel
Length
257 ft
1 main span
Daily traffic
10,180
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 Bs (ashmun) over Power Canal is a steel arch - thru carrying I-75 Bs (ashmun) over Power Canal in Chippewa County, Michigan. It was built in 1934 and reconstructed in 1998, so it is 91 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 10,180 vehicles a day, roughly 3% of them trucks, projected to reach 17,788 by 2018. The structure is 257 ft (78.3 m) long and 62 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesI-75 Bs (ashmun)
CrossesPower Canal
LocationIn Sault Ste Marie
RouteInterstate 75
CountyChippewa County
StateMichigan
Coordinates46.49544, -84.3493
Functional classUrban Other Principal 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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionAugust 2024
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating66 US tons
Inventory rating39.7 US tons

Structure

Structure typeArch - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length257 ft (78.3 m)
Longest span257 ft (78.3 m)
Deck width62 ft (18.9 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deck18 ft (5.6 m)

Traffic and service

Average daily traffic10,180 (2007)
Projected traffic17,788 by 2018
Trucks3%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 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-75 Bs (ashmun) over Power Canal built?

It was built in 1934, making it 91 years old in 2025. It was reconstructed in 1998.

What condition is I-75 Bs (ashmun) over Power Canal 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 I-75 Bs (ashmun) over Power Canal carry?

About 10,180 vehicles per day (2007 count), of which roughly 3% are trucks.

How long is I-75 Bs (ashmun) over Power Canal?

The structure is 257 ft (78.3 m) long with a longest span of 257 ft (78.3 m) and a deck 62 ft wide.

Who owns I-75 Bs (ashmun) over Power Canal?

It is owned by the State Highway Agency.