US Bridges

Willowbrook ST over Courter Ditch

Fair

Oakland County, Michigan · 0.3 MI S of Ten Mile RD · Structure no. 000000000008247

Built
1974
51 years old
Condition
Fair
inspected September 2024
Type
Tee Beam
Prestressed Concrete
Length
47 ft
1 main span
Daily traffic
1,415
1991 count
Owner
City
City or Municipal Highway Agency

About this bridge

Willowbrook ST over Courter Ditch is a prestressed concrete tee beam carrying Willowbrook ST over Courter Ditch in Oakland County, Michigan. It was built in 1974, so it is 51 years old, older 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 1,415 vehicles a day, roughly 3% of them trucks, projected to reach 1,600 by 2012. The structure is 47 ft (14.3 m) long and 39 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesWillowbrook ST
CrossesCourter Ditch
Location0.3 MI S of Ten Mile RD
RouteCity Street 0
CountyOakland County
StateMichigan
Coordinates42.46276, -83.44522
Functional classUrban 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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, precast panels
Main spans1
Design loadHS 20 + Mod
Structure length47 ft (14.3 m)
Longest span44 ft (13.4 m)
Deck width39 ft (12 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,415 (1991)
Projected traffic1,600 by 2012
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Willowbrook ST over Courter Ditch built?

It was built in 1974, making it 51 years old in 2025.

What condition is Willowbrook ST over Courter Ditch 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 September 2024.

How much traffic does Willowbrook ST over Courter Ditch carry?

About 1,415 vehicles per day (1991 count), of which roughly 3% are trucks.

How long is Willowbrook ST over Courter Ditch?

The structure is 47 ft (14.3 m) long with a longest span of 44 ft (13.4 m) and a deck 39 ft wide.

Who owns Willowbrook ST over Courter Ditch?

It is owned by the City or Municipal Highway Agency.