US Bridges

Roberts Road over Marine City Dredge Cut

Fair

St. Clair County, Michigan · Pc 191-318 Cottrellville · Structure no. 000000000010156

Built
1982
43 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Concrete
Length
40 ft
1 main span
Daily traffic
450
1994 count
Owner
County
County Highway Agency

About this bridge

Roberts Road over Marine City Dredge Cut is a concrete box beam or girders - multiple carrying Roberts Road over Marine City Dredge Cut in St. Clair County, Michigan. It was built in 1982, so it is 43 years old, younger 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 450 vehicles a day, roughly 3% of them trucks, projected to reach 550 by 2014. The structure is 40 ft (12.2 m) long and 31 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRoberts Road
CrossesMarine City Dredge Cut
LocationPc 191-318 Cottrellville
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates42.66401, -82.52944
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating38.9 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length40 ft (12.2 m)
Longest span38 ft (11.6 m)
Deck width31 ft (9.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (1994)
Projected traffic550 by 2014
Trucks3%
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$10,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Roberts Road over Marine City Dredge Cut built?

It was built in 1982, making it 43 years old in 2025.

What condition is Roberts Road over Marine City Dredge Cut 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 April 2024.

How much traffic does Roberts Road over Marine City Dredge Cut carry?

About 450 vehicles per day (1994 count), of which roughly 3% are trucks.

How long is Roberts Road over Marine City Dredge Cut?

The structure is 40 ft (12.2 m) long with a longest span of 38 ft (11.6 m) and a deck 31 ft wide.

Who owns Roberts Road over Marine City Dredge Cut?

It is owned by the County Highway Agency.