US Bridges

Cohoctah Road over Cohoctah-Deerfield Drain

PoorClosed to traffic

Livingston County, Michigan · Sec 6 Deerfield Twp · Structure no. 000000000005824

Built
1955
70 years old
Condition
Poor
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
90 ft
3 main spans
Daily traffic
2,156
2010 count
Owner
County
County Highway Agency

About this bridge

Cohoctah Road over Cohoctah-Deerfield Drain is a steel stringer/multi-beam or girder carrying Cohoctah Road over Cohoctah-Deerfield Drain in Livingston County, Michigan. It was built in 1955, so it is 70 years old, older 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 2 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. Its operating status is: closed to all traffic.

It carries about 2,156 vehicles a day, roughly 2% of them trucks, projected to reach 2,200 by 2045. The structure is 90 ft (27.4 m) long and 35 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCohoctah Road
CrossesCohoctah-Deerfield Drain
LocationSec 6 Deerfield Twp
RouteCounty Highway 4790
Coordinates42.76106, -83.91094
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Substructure7 GoodSome minor problems.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry4: 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 rating0.3 US tons
Inventory rating0 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length90 ft (27.4 m)
Longest span30 ft (9.1 m)
Deck width35 ft (10.6 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,156 (2010)
Projected traffic2,200 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Cohoctah Road over Cohoctah-Deerfield Drain built?

It was built in 1955, making it 70 years old in 2025.

What condition is Cohoctah Road over Cohoctah-Deerfield 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 October 2023.

How much traffic does Cohoctah Road over Cohoctah-Deerfield Drain carry?

About 2,156 vehicles per day (2010 count), of which roughly 2% are trucks.

How long is Cohoctah Road over Cohoctah-Deerfield Drain?

The structure is 90 ft (27.4 m) long with a longest span of 30 ft (9.1 m) and a deck 35 ft wide.

Who owns Cohoctah Road over Cohoctah-Deerfield Drain?

It is owned by the County Highway Agency.