US Bridges

I-75 SB Ramp H over Land for Raised Ramp

Fair

Saginaw County, Michigan · At Zilwaukee · Structure no. 000000000009170

Built
1984
41 years old
Condition
Fair
inspected August 2023
Type
Segmental Box Girder
Prestressed Concrete Continuous
Length
648 ft
4 main spans
Daily traffic
4,100
1988 count
Owner
State
State Highway Agency

About this bridge

I-75 SB Ramp H over Land for Raised Ramp is a prestressed concrete continuous segmental box girder carrying I-75 SB Ramp H over Land for Raised Ramp in Saginaw County, Michigan. It was built in 1984, so it is 41 years old, younger 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 4,100 vehicles a day, roughly 12% of them trucks, projected to reach 4,000 by 1977. The structure is 648 ft (197.5 m) long and 29 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 SB Ramp H
CrossesLand for Raised Ramp
LocationAt Zilwaukee
RouteInterstate 75
CountySaginaw County
StateMichigan
Coordinates43.4877, -83.92479
Functional classUrban 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.
Substructure7 GoodSome minor problems.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.1 US tons
Inventory rating34.3 US tons

Structure

Structure typeSegmental Box Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 25 or greater
Structure length648 ft (197.5 m)
Longest span243 ft (74 m)
Deck width29 ft (8.9 m)
Roadway width27 ft (8.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,100 (1988)
Projected traffic4,000 by 1977
Trucks12%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesOther
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 Ramp H over Land for Raised Ramp built?

It was built in 1984, making it 41 years old in 2025.

What condition is I-75 SB Ramp H over Land for Raised Ramp 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 SB Ramp H over Land for Raised Ramp carry?

About 4,100 vehicles per day (1988 count), of which roughly 12% are trucks.

How long is I-75 SB Ramp H over Land for Raised Ramp?

The structure is 648 ft (197.5 m) long with a longest span of 243 ft (74 m) and a deck 29 ft wide.

Who owns I-75 SB Ramp H over Land for Raised Ramp?

It is owned by the State Highway Agency.