US Bridges

M-19 over Middle Br Cass River

Fair

Sanilac County, Michigan · 7.8 MI N of M-46 · Structure no. 000000000009471

Built
1952
73 years old
Condition
Fair
inspected June 2024
Type
Tee Beam
Concrete
Length
35 ft
1 main span
Daily traffic
1,718
2007 count
Owner
State
State Highway Agency

About this bridge

M-19 over Middle Br Cass River is a concrete tee beam carrying M-19 over Middle Br Cass River in Sanilac County, Michigan. It was built in 1952, so it is 73 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 1,718 vehicles a day, roughly 10% of them trucks, projected to reach 2,396 by 2018. The structure is 35 ft (10.6 m) long and 44 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesM-19
CrossesMiddle Br Cass River
Location7.8 MI N of M-46
RouteState Highway 19
CountySanilac County
StateMichigan
Coordinates43.53196, -82.93421
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 protection8 Very GoodNo problems noted.
Last inspectionJune 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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45.3 US tons
Inventory rating27.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length35 ft (10.6 m)
Longest span35 ft (10.6 m)
Deck width44 ft (13.3 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,718 (2007)
Projected traffic2,396 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was M-19 over Middle Br Cass River built?

It was built in 1952, making it 73 years old in 2025.

What condition is M-19 over Middle Br 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 June 2024.

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

About 1,718 vehicles per day (2007 count), of which roughly 10% are trucks.

How long is M-19 over Middle Br Cass River?

The structure is 35 ft (10.6 m) long with a longest span of 35 ft (10.6 m) and a deck 44 ft wide.

Who owns M-19 over Middle Br Cass River?

It is owned by the State Highway Agency.