US Bridges

Audubon Drive over Unnamed Canal

Fair

St. Clair County, Michigan · Sec 1 Clay Twp · Structure no. 000000000010140

Built
1990
35 years old
Condition
Fair
inspected April 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
60 ft
1 main span
Daily traffic
690
1994 count
Owner
County
County Highway Agency

About this bridge

Audubon Drive over Unnamed Canal is a prestressed concrete box beam or girders - multiple carrying Audubon Drive over Unnamed Canal in St. Clair County, Michigan. It was built in 1990, so it is 35 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 690 vehicles a day, roughly 3% of them trucks, projected to reach 850 by 2014. The structure is 60 ft (18.2 m) long and 31 ft wide. If it were closed, the detour would be 124.3 mi (200 km).

Location

Open in Google Maps
CarriesAudubon Drive
CrossesUnnamed Canal
LocationSec 1 Clay Twp
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates42.63315, -82.61658
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating95.7 US tons
Inventory rating57.1 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckWood or timber
Main spans1
Design loadHS 20
Structure length60 ft (18.2 m)
Longest span56 ft (17 m)
Deck width31 ft (9.4 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic690 (1994)
Projected traffic850 by 2014
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed124.3 mi (200 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 Audubon Drive over Unnamed Canal built?

It was built in 1990, making it 35 years old in 2025.

What condition is Audubon Drive over Unnamed Canal 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 Audubon Drive over Unnamed Canal carry?

About 690 vehicles per day (1994 count), of which roughly 3% are trucks.

How long is Audubon Drive over Unnamed Canal?

The structure is 60 ft (18.2 m) long with a longest span of 56 ft (17 m) and a deck 31 ft wide.

Who owns Audubon Drive over Unnamed Canal?

It is owned by the County Highway Agency.