US Bridges

4 MI RD over I-75 NB

Fair

Crawford County, Michigan · 4.0 MI S of Grayling · Structure no. 000000000002034

Built
1961
64 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
211 ft
4 main spans
Daily traffic
180
1974 count
Owner
State
State Highway Agency

About this bridge

4 MI RD over I-75 NB is a steel stringer/multi-beam or girder carrying 4 MI RD 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 180 vehicles a day, projected to reach 180 by 1977. The structure is 211 ft (64.3 m) long and 31 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
Carries4 MI RD
CrossesI-75 NB
Location4.0 MI S of Grayling
RouteCounty Highway 0
CountyCrawford County
StateMichigan
Coordinates44.59846, -84.70898
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating77.5 US tons
Inventory rating46.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20 + Mod
Structure length211 ft (64.3 m)
Longest span71 ft (21.6 m)
Deck width31 ft (9.4 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic180 (1974)
Projected traffic180 by 1977
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed9.9 mi (16 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkSTRAHNET connector

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 4 MI RD over I-75 NB built?

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

What condition is 4 MI RD 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 2023.

How much traffic does 4 MI RD over I-75 NB carry?

About 180 vehicles per day (1974 count).

How long is 4 MI RD over I-75 NB?

The structure is 211 ft (64.3 m) long with a longest span of 71 ft (21.6 m) and a deck 31 ft wide.

Who owns 4 MI RD over I-75 NB?

It is owned by the State Highway Agency.