US Bridges

M-50 over River Raisin

Fair

Monroe County, Michigan · In Dundee Monroe ST · Structure no. 000000000007070

Built
1937
88 years old, rebuilt 2000
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete
Length
202 ft
3 main spans
Daily traffic
9,360
2007 count
Owner
State
State Highway Agency

About this bridge

M-50 over River Raisin is a prestressed concrete box beam or girders - single or spread carrying M-50 over River Raisin in Monroe County, Michigan. It was built in 1937 and reconstructed in 2000, so it is 88 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 9,360 vehicles a day, roughly 4% of them trucks, projected to reach 13,555 by 2018. The structure is 202 ft (61.5 m) long and 59 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesM-50
CrossesRiver Raisin
LocationIn Dundee Monroe ST
RouteState Highway 50
CountyMonroe County
StateMichigan
Coordinates41.95627, -83.65848
Functional classRural Minor Arterial

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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating35.1 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 20
Structure length202 ft (61.5 m)
Longest span82 ft (24.9 m)
Deck width59 ft (18.1 m)
Roadway width43 ft (13.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,360 (2007)
Projected traffic13,555 by 2018
Trucks4%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed8.7 mi (14 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-50 over River Raisin built?

It was built in 1937, making it 88 years old in 2025. It was reconstructed in 2000.

What condition is M-50 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 October 2023.

How much traffic does M-50 over River Raisin carry?

About 9,360 vehicles per day (2007 count), of which roughly 4% are trucks.

How long is M-50 over River Raisin?

The structure is 202 ft (61.5 m) long with a longest span of 82 ft (24.9 m) and a deck 59 ft wide.

Who owns M-50 over River Raisin?

It is owned by the State Highway Agency.