US Bridges

I-75 S-W Ramp over North Service RD

Poor

Wayne County, Michigan · In Detroit · Structure no. 000000000011829

Built
1964
61 years old
Condition
Poor
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
153 ft
3 main spans
Daily traffic
26,250
2014 count
Owner
State
State Highway Agency

About this bridge

I-75 S-W Ramp over North Service RD is a steel stringer/multi-beam or girder carrying I-75 S-W Ramp over North Service RD in Wayne County, Michigan. It was built in 1964, so it is 61 years old, older than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 26,250 vehicles a day, roughly 5% of them trucks, projected to reach 26,375 by 2034. The structure is 153 ft (46.5 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesI-75 S-W Ramp
CrossesNorth Service RD
LocationIn Detroit
RouteInterstate 75
CountyWayne County
StateMichigan
Coordinates42.36777, -83.06051
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 12 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 rating60 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length153 ft (46.5 m)
Longest span66 ft (20.1 m)
Deck width43 ft (13.2 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,250 (2014)
Projected traffic26,375 by 2034
Trucks5%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$100,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 S-W Ramp over North Service RD built?

It was built in 1964, making it 61 years old in 2025.

What condition is I-75 S-W Ramp over North Service RD in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in October 2024.

How much traffic does I-75 S-W Ramp over North Service RD carry?

About 26,250 vehicles per day (2014 count), of which roughly 5% are trucks.

How long is I-75 S-W Ramp over North Service RD?

The structure is 153 ft (46.5 m) long with a longest span of 66 ft (20.1 m) and a deck 43 ft wide.

Who owns I-75 S-W Ramp over North Service RD?

It is owned by the State Highway Agency.