US Bridges

M-19 over Cass River

Fair

Huron County, Michigan · 1.4 MI N of Sanilac Col · Structure no. 000000000003478

Built
1957
68 years old
Condition
Fair
inspected May 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
40 ft
1 main span
Daily traffic
3,478
2007 count
Owner
State
State Highway Agency

About this bridge

M-19 over Cass River is a prestressed concrete box beam or girders - multiple carrying M-19 over Cass River in Huron County, Michigan. It was built in 1957, so it is 68 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 3,478 vehicles a day, roughly 10% of them trucks, projected to reach 2,052 by 2018. The structure is 40 ft (12.2 m) long and 43 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesM-19
CrossesCass River
Location1.4 MI N of Sanilac Col
RouteState Highway 19
CountyHuron County
StateMichigan
Coordinates43.70129, -82.93856
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.
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 inspectionMay 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 geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating76.4 US tons
Inventory rating45.7 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width43 ft (13.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,478 (2007)
Projected traffic2,052 by 2018
Trucks10%
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

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedDeck replacement with only incidental widening
Estimated improvement cost$24,000
NavigationNo navigation control on waterway

Frequently asked questions

When was M-19 over Cass River built?

It was built in 1957, making it 68 years old in 2025.

What condition is M-19 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 May 2024.

How much traffic does M-19 over Cass River carry?

About 3,478 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is M-19 over Cass River?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 43 ft wide.

Who owns M-19 over Cass River?

It is owned by the State Highway Agency.