US Bridges

Imlay City Road over Whackenbush Drain

Poor

St. Clair County, Michigan · Sec. 16-21 Kenockee Twp. · Structure no. 000000000010068

Built
1978
47 years old
Condition
Poor
inspected March 2024
Type
Culvert
Steel
Length
25 ft
2 main spans
Daily traffic
155
1994 count
Owner
County
County Highway Agency

About this bridge

Imlay City Road over Whackenbush Drain is a steel culvert carrying Imlay City Road over Whackenbush Drain in St. Clair County, Michigan. It was built in 1978, so it is 47 years old, younger than the Michigan average of 48.3 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 155 vehicles a day, roughly 3% of them trucks, projected to reach 185 by 2014. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesImlay City Road
CrossesWhackenbush Drain
LocationSec. 16-21 Kenockee Twp.
RouteCounty Highway 0
CountySt. Clair County
StateMichigan
Coordinates43.03177, -82.71051
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 12 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.8 US tons
Inventory rating56.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20 + Mod
Structure length25 ft (7.6 m)
Longest span11 ft (3.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic155 (1994)
Projected traffic185 by 2014
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 Imlay City Road over Whackenbush Drain built?

It was built in 1978, making it 47 years old in 2025.

What condition is Imlay City Road over Whackenbush Drain in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in March 2024.

How much traffic does Imlay City Road over Whackenbush Drain carry?

About 155 vehicles per day (1994 count), of which roughly 3% are trucks.

How long is Imlay City Road over Whackenbush Drain?

The structure is 25 ft (7.6 m) long with a longest span of 11 ft (3.3 m).

Who owns Imlay City Road over Whackenbush Drain?

It is owned by the County Highway Agency.