US Bridges

M-50 over River Raisin

Fair

Lenawee County, Michigan · In Tecumseh · Structure no. 000000000005536

Built
1953
72 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
145 ft
3 main spans
Daily traffic
10,655
2007 count
Owner
State
State Highway Agency

About this bridge

M-50 over River Raisin is a steel stringer/multi-beam or girder carrying M-50 over River Raisin in Lenawee County, Michigan. It was built in 1953, so it is 72 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 10,655 vehicles a day, roughly 7% of them trucks, projected to reach 13,496 by 2018. The structure is 145 ft (44.2 m) long and 48 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesM-50
CrossesRiver Raisin
LocationIn Tecumseh
RouteState Highway 50
CountyLenawee County
StateMichigan
Coordinates42.00376, -83.9313
Functional classUrban 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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 inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating86.8 US tons
Inventory rating51.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length145 ft (44.2 m)
Longest span65 ft (19.8 m)
Deck width48 ft (14.6 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,655 (2007)
Projected traffic13,496 by 2018
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 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 1953, making it 72 years old in 2025.

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 September 2024.

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

About 10,655 vehicles per day (2007 count), of which roughly 7% are trucks.

How long is M-50 over River Raisin?

The structure is 145 ft (44.2 m) long with a longest span of 65 ft (19.8 m) and a deck 48 ft wide.

Who owns M-50 over River Raisin?

It is owned by the State Highway Agency.