US Bridges

Marlette Road over Potts Drain

Good

Sanilac County, Michigan · Sec 31 Washington Twp · Structure no. 000000000009529

Built
1996
29 years old
Condition
Good
inspected May 2024
Type
Culvert
Steel
Length
25 ft
1 main span
Daily traffic
840
2010 count
Owner
County
County Highway Agency

About this bridge

Marlette Road over Potts Drain is a steel culvert carrying Marlette Road over Potts Drain in Sanilac County, Michigan. It was built in 1996, so it is 29 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 840 vehicles a day, roughly 10% of them trucks, projected to reach 1,520 by 2030. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 6.8 mi (11 km).

CarriesMarlette Road
CrossesPotts Drain
LocationSec 31 Washington Twp
RouteCounty Highway 7432
Coordinates43.33695, -82.73838
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation7: Better than present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107.1 US tons
Inventory rating107.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span25 ft (7.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic840 (2010)
Projected traffic1,520 by 2030
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Marlette Road over Potts Drain built?

It was built in 1996, making it 29 years old in 2025.

What condition is Marlette Road over Potts Drain 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 May 2024.

How much traffic does Marlette Road over Potts Drain carry?

About 840 vehicles per day (2010 count), of which roughly 10% are trucks.

How long is Marlette Road over Potts Drain?

The structure is 25 ft (7.6 m) long with a longest span of 25 ft (7.6 m).

Who owns Marlette Road over Potts Drain?

It is owned by the County Highway Agency.