US Bridges

Rau Road over I-75 SB

Fair

Ogemaw County, Michigan · 3.0 MI S of West Branch · Structure no. 000000000008426

Built
1970
55 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
171 ft
3 main spans
Daily traffic
1,609
2020 count
Owner
State
State Highway Agency

About this bridge

Rau Road over I-75 SB is a steel stringer/multi-beam or girder carrying Rau Road over I-75 SB in Ogemaw County, Michigan. It was built in 1970, so it is 55 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 1,609 vehicles a day, roughly 3% of them trucks, projected to reach 1,851 by 2040. The structure is 171 ft (52.1 m) long and 38 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesRau Road
CrossesI-75 SB
Location3.0 MI S of West Branch
RouteCounty Highway 0
CountyOgemaw County
StateMichigan
Coordinates44.23341, -84.21389
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
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 alignment7: Better than present minimum criteria
Operating rating56.4 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length171 ft (52.1 m)
Longest span94 ft (28.7 m)
Deck width38 ft (11.7 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,609 (2020)
Projected traffic1,851 by 2040
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 Rau Road over I-75 SB built?

It was built in 1970, making it 55 years old in 2025.

What condition is Rau Road over I-75 SB 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 2023.

How much traffic does Rau Road over I-75 SB carry?

About 1,609 vehicles per day (2020 count), of which roughly 3% are trucks.

How long is Rau Road over I-75 SB?

The structure is 171 ft (52.1 m) long with a longest span of 94 ft (28.7 m) and a deck 38 ft wide.

Who owns Rau Road over I-75 SB?

It is owned by the State Highway Agency.