US Bridges

Main ST over I-75 NB

Fair

Otsego County, Michigan · In Vanderbilt · Structure no. 000000000008682

Built
1962
63 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
268 ft
5 main spans
Daily traffic
950
1988 count
Owner
State
State Highway Agency

About this bridge

Main ST over I-75 NB is a prestressed concrete stringer/multi-beam or girder carrying Main ST over I-75 NB 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 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 950 vehicles a day, roughly 2% of them trucks, projected to reach 850 by 1989. The structure is 268 ft (81.8 m) long and 31 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesMain ST
CrossesI-75 NB
LocationIn Vanderbilt
RouteCity Street 0
CountyOtsego County
StateMichigan
Coordinates45.14269, -84.67017
Functional classRural Major Collector

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating59.6 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadH 15
Structure length268 ft (81.8 m)
Longest span65 ft (19.8 m)
Deck width31 ft (9.4 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic950 (1988)
Projected traffic850 by 1989
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 Main ST over I-75 NB built?

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

What condition is Main ST over I-75 NB 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 September 2024.

How much traffic does Main ST over I-75 NB carry?

About 950 vehicles per day (1988 count), of which roughly 2% are trucks.

How long is Main ST over I-75 NB?

The structure is 268 ft (81.8 m) long with a longest span of 65 ft (19.8 m) and a deck 31 ft wide.

Who owns Main ST over I-75 NB?

It is owned by the State Highway Agency.