US Bridges

Stilson Road over Potts Drain

Fair

Sanilac County, Michigan · Sec 8-17 Buel Twp · Structure no. 000000000009525

Built
1991
34 years old
Condition
Fair
inspected May 2024
Type
Culvert
Steel
Length
21 ft
1 main span
Daily traffic
320
2010 count
Owner
County
County Highway Agency

About this bridge

Stilson Road over Potts Drain is a steel culvert carrying Stilson Road over Potts Drain in Sanilac County, Michigan. It was built in 1991, so it is 34 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 6 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 320 vehicles a day, roughly 10% of them trucks, projected to reach 575 by 2030. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 6.8 mi (11 km).

CarriesStilson Road
CrossesPotts Drain
LocationSec 8-17 Buel Twp
RouteCounty Highway 0
Coordinates43.30401, -82.74249
Functional classRural Minor Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable 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 length21 ft (6.4 m)
Longest span21 ft (6.4 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic320 (2010)
Projected traffic575 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 Stilson Road over Potts Drain built?

It was built in 1991, making it 34 years old in 2025.

What condition is Stilson Road over Potts Drain 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 May 2024.

How much traffic does Stilson Road over Potts Drain carry?

About 320 vehicles per day (2010 count), of which roughly 10% are trucks.

How long is Stilson Road over Potts Drain?

The structure is 21 ft (6.4 m) long with a longest span of 21 ft (6.4 m).

Who owns Stilson Road over Potts Drain?

It is owned by the County Highway Agency.