US Bridges

I-75 SB over Lake State RR

Poor

Crawford County, Michigan · 0.5 MI S of M-72 · Structure no. 000000000002032

Built
1961
64 years old
Condition
Poor
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
141 ft
3 main spans
Daily traffic
5,877
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 SB over Lake State RR is a steel stringer/multi-beam or girder carrying I-75 SB over Lake State RR in Crawford County, Michigan. It was built in 1961, so it is 64 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 5,877 vehicles a day, roughly 12% of them trucks, projected to reach 10,388 by 2018. The structure is 141 ft (43.1 m) long and 47 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-75 SB
CrossesLake State RR
Location0.5 MI S of M-72
RouteInterstate 75
CountyCrawford County
StateMichigan
Coordinates44.65213, -84.7035
Functional classRural 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
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.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating62.2 US tons
Inventory rating37.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length141 ft (43.1 m)
Longest span47 ft (14.2 m)
Deck width47 ft (14.4 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,877 (2007)
Projected traffic10,388 by 2018
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesRailroad
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 Lake State RR built?

It was built in 1961, making it 64 years old in 2025.

What condition is I-75 SB over Lake State RR 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 September 2024.

How much traffic does I-75 SB over Lake State RR carry?

About 5,877 vehicles per day (2007 count), of which roughly 12% are trucks.

How long is I-75 SB over Lake State RR?

The structure is 141 ft (43.1 m) long with a longest span of 47 ft (14.2 m) and a deck 47 ft wide.

Who owns I-75 SB over Lake State RR?

It is owned by the State Highway Agency.