US Bridges

Grand Blanc RD over I-75

Fair

Genesee County, Michigan · 3.0 MI SE of US-23 · Structure no. 000000000002630

Built
1962
63 years old, rebuilt 1980
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
311 ft
4 main spans
Daily traffic
13,000
2013 count
Owner
State
State Highway Agency

About this bridge

Grand Blanc RD over I-75 is a steel stringer/multi-beam or girder carrying Grand Blanc RD over I-75 in Genesee County, Michigan. It was built in 1962 and reconstructed in 1980, 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 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 13,000 vehicles a day, roughly 3% of them trucks, projected to reach 19,000 by 2016. The structure is 311 ft (94.9 m) long and 55 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesGrand Blanc RD
CrossesI-75
Location3.0 MI SE of US-23
RouteCounty Highway 2002
CountyGenesee County
StateMichigan
Coordinates42.91512, -83.67291
Functional classUrban Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionMarch 2024
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 alignment8: Equal to present desirable criteria
Operating rating61.8 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length311 ft (94.9 m)
Longest span106 ft (32.3 m)
Deck width55 ft (16.7 m)
Roadway width51 ft (15.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,000 (2013)
Projected traffic19,000 by 2016
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
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 statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Grand Blanc RD over I-75 built?

It was built in 1962, making it 63 years old in 2025. It was reconstructed in 1980.

What condition is Grand Blanc RD over I-75 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 March 2024.

How much traffic does Grand Blanc RD over I-75 carry?

About 13,000 vehicles per day (2013 count), of which roughly 3% are trucks.

How long is Grand Blanc RD over I-75?

The structure is 311 ft (94.9 m) long with a longest span of 106 ft (32.3 m) and a deck 55 ft wide.

Who owns Grand Blanc RD over I-75?

It is owned by the State Highway Agency.