US Bridges

County Road 612 over I-75 NB

Fair

Crawford County, Michigan · 5.1 MI S of Otsego Col · Structure no. 000000000002048

Built
1961
64 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
128 ft
3 main spans
Daily traffic
390
1974 count
Owner
State
State Highway Agency

About this bridge

County Road 612 over I-75 NB is a steel stringer/multi-beam or girder carrying County Road 612 over I-75 NB 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 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 390 vehicles a day, projected to reach 390 by 1977. The structure is 128 ft (39.1 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesCounty Road 612
CrossesI-75 NB
Location5.1 MI S of Otsego Col
RouteCounty Highway 612
CountyCrawford County
StateMichigan
Coordinates44.78586, -84.71459
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
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating58.5 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length128 ft (39.1 m)
Longest span56 ft (17.2 m)
Deck width33 ft (10 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic390 (1974)
Projected traffic390 by 1977
Trucks—
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 proposedDeck replacement with only incidental widening
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was County Road 612 over I-75 NB built?

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

What condition is County Road 612 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 County Road 612 over I-75 NB carry?

About 390 vehicles per day (1974 count).

How long is County Road 612 over I-75 NB?

The structure is 128 ft (39.1 m) long with a longest span of 56 ft (17.2 m) and a deck 33 ft wide.

Who owns County Road 612 over I-75 NB?

It is owned by the State Highway Agency.