US Bridges

I-75 SB over S Grayling RD

Fair

Crawford County, Michigan · 6.0 MI S of Grayling · Structure no. 000000000002057

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
117 ft
1 main span
Daily traffic
11,000
2009 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over S Grayling RD is a steel stringer/multi-beam or girder carrying I-75 SB over S Grayling RD in Crawford County, Michigan. It was built in 1970, so it is 55 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 11,000 vehicles a day, roughly 9% of them trucks, projected to reach 12,950 by 2031. The structure is 117 ft (35.8 m) long and 44 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 SB
CrossesS Grayling RD
Location6.0 MI S of Grayling
RouteInterstate 75
CountyCrawford County
StateMichigan
Coordinates44.57159, -84.70934
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.
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.
Last inspectionMay 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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating65 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length117 ft (35.8 m)
Longest span112 ft (34.1 m)
Deck width44 ft (13.5 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2009)
Projected traffic12,950 by 2031
Trucks9%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.2 mi (2 km)
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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 SB over S Grayling RD built?

It was built in 1970, making it 55 years old in 2025.

What condition is I-75 SB over S Grayling RD 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-75 SB over S Grayling RD carry?

About 11,000 vehicles per day (2009 count), of which roughly 9% are trucks.

How long is I-75 SB over S Grayling RD?

The structure is 117 ft (35.8 m) long with a longest span of 112 ft (34.1 m) and a deck 44 ft wide.

Who owns I-75 SB over S Grayling RD?

It is owned by the State Highway Agency.