US Bridges

Patterson Road over S Fork of N Br Cass Riv

Fair

Sanilac County, Michigan · Sec 16-17 Austin Twp · Structure no. 000000000009571

Built
1985
40 years old
Condition
Fair
inspected June 2024
Type
Culvert
Steel
Length
39 ft
3 main spans
Daily traffic
150
2010 count
Owner
County
County Highway Agency

About this bridge

Patterson Road over S Fork of N Br Cass Riv is a steel culvert carrying Patterson Road over S Fork of N Br Cass Riv in Sanilac County, Michigan. It was built in 1985, so it is 40 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 150 vehicles a day, roughly 7% of them trucks, projected to reach 270 by 2030. The structure is 39 ft (11.9 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesPatterson Road
CrossesS Fork of N Br Cass Riv
LocationSec 16-17 Austin Twp
RouteCounty Highway 0
CountySanilac County
StateMichigan
Coordinates43.64701, -82.95763
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating27.4 US tons
Inventory rating16.4 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadH 20
Structure length39 ft (11.9 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic150 (2010)
Projected traffic270 by 2030
Trucks7%
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 Patterson Road over S Fork of N Br Cass Riv built?

It was built in 1985, making it 40 years old in 2025.

What condition is Patterson Road over S Fork of N Br Cass Riv 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 June 2024.

How much traffic does Patterson Road over S Fork of N Br Cass Riv carry?

About 150 vehicles per day (2010 count), of which roughly 7% are trucks.

How long is Patterson Road over S Fork of N Br Cass Riv?

The structure is 39 ft (11.9 m) long with a longest span of 12 ft (3.6 m).

Who owns Patterson Road over S Fork of N Br Cass Riv?

It is owned by the County Highway Agency.