US Bridges

Chartier Road over Marine City Dredge Cut

Good

St. Clair County, Michigan · Sec 10 Cottrellville Twp · Structure no. 000000000010033

Built
1922
103 years old
Condition
Good
inspected December 2023
Type
Girder and Floorbeam System
Concrete
Length
36 ft
1 main span
Daily traffic
2,800
1994 count
Owner
County
County Highway Agency

About this bridge

Chartier Road over Marine City Dredge Cut is a concrete girder and floorbeam system carrying Chartier Road over Marine City Dredge Cut in St. Clair County, Michigan. It was built in 1922, so it is 103 years old, older 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 2,800 vehicles a day, roughly 5% of them trucks, projected to reach 3,450 by 2014. The structure is 36 ft (10.9 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesChartier Road
CrossesMarine City Dredge Cut
LocationSec 10 Cottrellville Twp
RouteCounty Highway 7771
CountySt. Clair County
StateMichigan
Coordinates42.70793, -82.53362
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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionDecember 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating107.1 US tons
Inventory rating83.6 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length36 ft (10.9 m)
Longest span32 ft (9.7 m)
Deck width25 ft (7.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,800 (1994)
Projected traffic3,450 by 2014
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$600,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Chartier Road over Marine City Dredge Cut built?

It was built in 1922, making it 103 years old in 2025.

What condition is Chartier Road over Marine City Dredge Cut 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 December 2023.

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

About 2,800 vehicles per day (1994 count), of which roughly 5% are trucks.

How long is Chartier Road over Marine City Dredge Cut?

The structure is 36 ft (10.9 m) long with a longest span of 32 ft (9.7 m) and a deck 25 ft wide.

Who owns Chartier Road over Marine City Dredge Cut?

It is owned by the County Highway Agency.