US Bridges

Austin Road over River Raisin

Fair

Washtenaw County, Michigan · Manchester Twp Sec 1 · Structure no. 000000000010964

Built
1987
38 years old
Condition
Fair
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
70 ft
2 main spans
Daily traffic
4,366
2018 count
Owner
County
County Highway Agency

About this bridge

Austin Road over River Raisin is a prestressed concrete box beam or girders - multiple carrying Austin Road over River Raisin in Washtenaw County, Michigan. It was built in 1987, so it is 38 years old, younger 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 4,366 vehicles a day, roughly 12% of them trucks, projected to reach 4,521 by 2038. The structure is 70 ft (21.3 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesAustin Road
CrossesRiver Raisin
LocationManchester Twp Sec 1
RouteCounty Highway 8122
CountyWashtenaw County
StateMichigan
Coordinates42.14762, -84.01523
Functional classRural Local

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.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56.8 US tons
Inventory rating34 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans2
Design loadHS 20 + Mod
Structure length70 ft (21.3 m)
Longest span35 ft (10.7 m)
Deck width44 ft (13.3 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,366 (2018)
Projected traffic4,521 by 2038
Trucks12%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$320,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Austin Road over River Raisin built?

It was built in 1987, making it 38 years old in 2025.

What condition is Austin Road over River Raisin 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 April 2023.

How much traffic does Austin Road over River Raisin carry?

About 4,366 vehicles per day (2018 count), of which roughly 12% are trucks.

How long is Austin Road over River Raisin?

The structure is 70 ft (21.3 m) long with a longest span of 35 ft (10.7 m) and a deck 44 ft wide.

Who owns Austin Road over River Raisin?

It is owned by the County Highway Agency.