US Bridges

Mortar Creek RD over I-75

Fair

Monroe County, Michigan · 2.5 MI SW of Monroe · Structure no. 000000000007182

Built
1974
51 years old
Condition
Fair
inspected June 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
235 ft
2 main spans
Daily traffic
610
1995 count
Owner
State
State Highway Agency

About this bridge

Mortar Creek RD over I-75 is a steel stringer/multi-beam or girder carrying Mortar Creek RD over I-75 in Monroe County, Michigan. It was built in 1974, so it is 51 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 610 vehicles a day, roughly 3% of them trucks, projected to reach 610 by 2015. The structure is 235 ft (71.6 m) long and 39 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesMortar Creek RD
CrossesI-75
Location2.5 MI SW of Monroe
RouteCounty Highway 0
CountyMonroe County
StateMichigan
Coordinates41.86053, -83.40824
Functional classUrban Local

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating88.6 US tons
Inventory rating52.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length235 ft (71.6 m)
Longest span120 ft (36.5 m)
Deck width39 ft (12 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic610 (1995)
Projected traffic610 by 2015
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mortar Creek RD over I-75 built?

It was built in 1974, making it 51 years old in 2025.

What condition is Mortar Creek 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 June 2023.

How much traffic does Mortar Creek RD over I-75 carry?

About 610 vehicles per day (1995 count), of which roughly 3% are trucks.

How long is Mortar Creek RD over I-75?

The structure is 235 ft (71.6 m) long with a longest span of 120 ft (36.5 m) and a deck 39 ft wide.

Who owns Mortar Creek RD over I-75?

It is owned by the State Highway Agency.