US Bridges

I-75 NB over Lake State RR

Fair

Otsego County, Michigan · 2.7 MI S of M-32 · Structure no. 000000000008670

Built
1962
63 years old
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
193 ft
3 main spans
Daily traffic
6,791
2007 count
Owner
State
State Highway Agency

About this bridge

I-75 NB over Lake State RR is a steel stringer/multi-beam or girder carrying I-75 NB over Lake State RR in Otsego County, Michigan. It was built in 1962, 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 6,791 vehicles a day, roughly 10% of them trucks, projected to reach 9,705 by 2018. The structure is 193 ft (58.7 m) long and 43 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesI-75 NB
CrossesLake State RR
Location2.7 MI S of M-32
RouteInterstate 75
CountyOtsego County
StateMichigan
Coordinates44.9912, -84.68134
Functional classRural 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
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 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 geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating93.3 US tons
Inventory rating55.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length193 ft (58.7 m)
Longest span64 ft (19.4 m)
Deck width43 ft (13.2 m)
Roadway width38 ft (11.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,791 (2007)
Projected traffic9,705 by 2018
Trucks10%
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 proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-75 NB over Lake State RR built?

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

What condition is I-75 NB over Lake State RR 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 October 2024.

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

About 6,791 vehicles per day (2007 count), of which roughly 10% are trucks.

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

The structure is 193 ft (58.7 m) long with a longest span of 64 ft (19.4 m) and a deck 43 ft wide.

Who owns I-75 NB over Lake State RR?

It is owned by the State Highway Agency.