US Bridges

French Line Road over S Br Cass River I/C Drn

Good

Sanilac County, Michigan · Sec 19-30 Elmer Twp · Structure no. 000000000009561

Built
1986
39 years old
Condition
Good
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
80 ft
1 main span
Daily traffic
314
2016 count
Owner
County
County Highway Agency

About this bridge

French Line Road over S Br Cass River I/C Drn is a prestressed concrete box beam or girders - multiple carrying French Line Road over S Br Cass River I/C Drn in Sanilac County, Michigan. It was built in 1986, so it is 39 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 314 vehicles a day, roughly 10% of them trucks, projected to reach 507 by 2036. The structure is 80 ft (24.4 m) long and 34 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesFrench Line Road
CrossesS Br Cass River I/C Drn
LocationSec 19-30 Elmer Twp
RouteCounty Highway 7438
Coordinates43.35914, -82.97743
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating46.7 US tons
Inventory rating32.8 US tons

Structure

MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20
Structure length80 ft (24.4 m)
Longest span78 ft (23.9 m)
Deck width34 ft (10.5 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic314 (2016)
Projected traffic507 by 2036
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 French Line Road over S Br Cass River I/C Drn built?

It was built in 1986, making it 39 years old in 2025.

What condition is French Line Road over S Br Cass River I/C Drn in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in April 2024.

How much traffic does French Line Road over S Br Cass River I/C Drn carry?

About 314 vehicles per day (2016 count), of which roughly 10% are trucks.

How long is French Line Road over S Br Cass River I/C Drn?

The structure is 80 ft (24.4 m) long with a longest span of 78 ft (23.9 m) and a deck 34 ft wide.

Who owns French Line Road over S Br Cass River I/C Drn?

It is owned by the County Highway Agency.