US Bridges

Allen Road over River Raisin

Good

Washtenaw County, Michigan · Bridgewater Twp Sec 29&32 · Structure no. 000000000011041

Built
1993
32 years old
Condition
Good
inspected July 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
54 ft
1 main span
Daily traffic
287
2005 count
Owner
County
County Highway Agency

About this bridge

Allen Road over River Raisin is a prestressed concrete box beam or girders - multiple carrying Allen Road over River Raisin in Washtenaw County, Michigan. It was built in 1993, so it is 32 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 287 vehicles a day, roughly 5% of them trucks, projected to reach 518 by 2025. The structure is 54 ft (16.4 m) long and 34 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesAllen Road
CrossesRiver Raisin
LocationBridgewater Twp Sec 29&32
RouteCounty Highway 0
CountyWashtenaw County
StateMichigan
Coordinates42.09321, -83.97613
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating69.3 US tons
Inventory rating40.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length54 ft (16.4 m)
Longest span54 ft (16.4 m)
Deck width34 ft (10.5 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic287 (2005)
Projected traffic518 by 2025
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 proposedNone recorded
Estimated improvement cost$360,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Allen Road over River Raisin built?

It was built in 1993, making it 32 years old in 2025.

What condition is Allen Road over River Raisin in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in July 2023.

How much traffic does Allen Road over River Raisin carry?

About 287 vehicles per day (2005 count), of which roughly 5% are trucks.

How long is Allen Road over River Raisin?

The structure is 54 ft (16.4 m) long with a longest span of 54 ft (16.4 m) and a deck 34 ft wide.

Who owns Allen Road over River Raisin?

It is owned by the County Highway Agency.