US Bridges

I-75 Bl|federal Hi over I-75 NB

Fair

Roscommon County, Michigan · 3.0 MI W of Roscommon · Structure no. 000000000009028

Built
1971
54 years old
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
513 ft
7 main spans
Daily traffic
3,361
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 Bl|federal Hi over I-75 NB is a steel stringer/multi-beam or girder carrying I-75 Bl|federal Hi over I-75 NB in Roscommon County, Michigan. It was built in 1971, so it is 54 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 3,361 vehicles a day, roughly 9% of them trucks, projected to reach 4,278 by 2018. The structure is 513 ft (156.3 m) long and 51 ft wide.

Location

Open in Google Maps
CarriesI-75 Bl|federal Hi
CrossesI-75 NB
Location3.0 MI W of Roscommon
RouteInterstate 75
CountyRoscommon County
StateMichigan
Coordinates44.5112, -84.66049
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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating89.6 US tons
Inventory rating53.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans7
Design loadHS 20
Structure length513 ft (156.3 m)
Longest span103 ft (31.4 m)
Deck width51 ft (15.4 m)
Roadway width47 ft (14.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,361 (2007)
Projected traffic4,278 by 2018
Trucks9%
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 Bl|federal Hi over I-75 NB built?

It was built in 1971, making it 54 years old in 2025.

What condition is I-75 Bl|federal Hi 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 August 2023.

How much traffic does I-75 Bl|federal Hi over I-75 NB carry?

About 3,361 vehicles per day (2007 count), of which roughly 9% are trucks.

How long is I-75 Bl|federal Hi over I-75 NB?

The structure is 513 ft (156.3 m) long with a longest span of 103 ft (31.4 m) and a deck 51 ft wide.

Who owns I-75 Bl|federal Hi over I-75 NB?

It is owned by the State Highway Agency.