US Bridges

M-83 over Cass River

Fair

Saginaw County, Michigan · In Frankenmuth · Structure no. 000000000009178

Built
1943
82 years old, rebuilt 1979
Condition
Fair
inspected August 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
240 ft
4 main spans
Daily traffic
11,600
2013 count
Owner
State
State Highway Agency

About this bridge

M-83 over Cass River is a steel stringer/multi-beam or girder carrying M-83 over Cass River in Saginaw County, Michigan. It was built in 1943 and reconstructed in 1979, so it is 82 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 11,600 vehicles a day, roughly 3% of them trucks, projected to reach 13,340 by 2033. The structure is 240 ft (73.2 m) long and 64 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesM-83
CrossesCass River
LocationIn Frankenmuth
RouteState Highway 83
CountySaginaw County
StateMichigan
Coordinates43.32431, -83.74046
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
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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionAugust 2023
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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating67.1 US tons
Inventory rating34.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length240 ft (73.2 m)
Longest span60 ft (18.3 m)
Deck width64 ft (19.5 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,600 (2013)
Projected traffic13,340 by 2033
Trucks3%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-83 over Cass River built?

It was built in 1943, making it 82 years old in 2025. It was reconstructed in 1979.

What condition is M-83 over Cass River 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 August 2023.

How much traffic does M-83 over Cass River carry?

About 11,600 vehicles per day (2013 count), of which roughly 3% are trucks.

How long is M-83 over Cass River?

The structure is 240 ft (73.2 m) long with a longest span of 60 ft (18.3 m) and a deck 64 ft wide.

Who owns M-83 over Cass River?

It is owned by the State Highway Agency.