US Bridges

I-75 BS|3 Mile RD over I-75 NB

Fair

Chippewa County, Michigan · S Lts of Sault Ste Marie · Structure no. 000000000001586

Built
1962
63 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
225 ft
4 main spans
Daily traffic
15,700
2013 count
Owner
State
State Highway Agency

About this bridge

I-75 BS|3 Mile RD over I-75 NB is a steel stringer/multi-beam or girder carrying I-75 BS|3 Mile RD over I-75 NB in Chippewa County, Michigan. It was built in 1962, so it is 63 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 15,700 vehicles a day, roughly 2% of them trucks, projected to reach 17,400 by 2033. The structure is 225 ft (68.6 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesI-75 BS|3 Mile RD
CrossesI-75 NB
LocationS Lts of Sault Ste Marie
RouteInterstate 75
CountyChippewa County
StateMichigan
Coordinates46.46288, -84.38313
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating68.2 US tons
Inventory rating40.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length225 ft (68.6 m)
Longest span75 ft (22.9 m)
Deck width35 ft (10.6 m)
Roadway width32 ft (9.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,700 (2013)
Projected traffic17,400 by 2033
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 BS|3 Mile RD over I-75 NB built?

It was built in 1962, making it 63 years old in 2025.

What condition is I-75 BS|3 Mile RD over I-75 NB 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 April 2024.

How much traffic does I-75 BS|3 Mile RD over I-75 NB carry?

About 15,700 vehicles per day (2013 count), of which roughly 2% are trucks.

How long is I-75 BS|3 Mile RD over I-75 NB?

The structure is 225 ft (68.6 m) long with a longest span of 75 ft (22.9 m) and a deck 35 ft wide.

Who owns I-75 BS|3 Mile RD over I-75 NB?

It is owned by the State Highway Agency.