US Bridges

I-75 SB over Sturgeon River

Fair

Cheboygan County, Michigan · 2.3 MI N of Otsego Col · Structure no. 000000000001521

Built
1962
63 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
49 ft
1 main span
Daily traffic
7,777
2018 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over Sturgeon River is a steel stringer/multi-beam or girder carrying I-75 SB over Sturgeon River in Cheboygan 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 7,777 vehicles a day, roughly 6% of them trucks, projected to reach 8,944 by 2038. The structure is 49 ft (14.9 m) long and 44 ft wide.

Location

Open in Google Maps
CarriesI-75 SB
CrossesSturgeon River
Location2.3 MI N of Otsego Col
RouteInterstate 75
CountyCheboygan County
StateMichigan
Coordinates45.22628, -84.59277
Functional classRural Principal Arterial - Interstate

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating104.6 US tons
Inventory rating41.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length49 ft (14.9 m)
Longest span47 ft (14.4 m)
Deck width44 ft (13.3 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,777 (2018)
Projected traffic8,944 by 2038
Trucks6%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-75 SB over Sturgeon River built?

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

What condition is I-75 SB over Sturgeon 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 June 2023.

How much traffic does I-75 SB over Sturgeon River carry?

About 7,777 vehicles per day (2018 count), of which roughly 6% are trucks.

How long is I-75 SB over Sturgeon River?

The structure is 49 ft (14.9 m) long with a longest span of 47 ft (14.4 m) and a deck 44 ft wide.

Who owns I-75 SB over Sturgeon River?

It is owned by the State Highway Agency.