US Bridges

M-85 NB over Frank & Poet Drain

Fair

Wayne County, Michigan · In Trenton · Structure no. 000000000011787

Built
1958
67 years old
Condition
Fair
inspected May 2024
Type
Tee Beam
Concrete
Length
55 ft
1 main span
Daily traffic
15,575
2014 count
Owner
State
State Highway Agency

About this bridge

M-85 NB over Frank & Poet Drain is a concrete tee beam carrying M-85 NB over Frank & Poet Drain in Wayne County, Michigan. It was built in 1958, so it is 67 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 15,575 vehicles a day, roughly 7% of them trucks, projected to reach 17,325 by 2036. The structure is 55 ft (16.8 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

CarriesM-85 NB
CrossesFrank & Poet Drain
LocationIn Trenton
RouteState Highway 85
Coordinates42.12476, -83.20336
Functional classUrban Other Principal Arterial

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating96.8 US tons
Inventory rating58.2 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length55 ft (16.8 m)
Longest span55 ft (16.8 m)
Deck width46 ft (14 m)
Roadway width43 ft (13.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,575 (2014)
Projected traffic17,325 by 2036
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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 M-85 NB over Frank & Poet Drain built?

It was built in 1958, making it 67 years old in 2025.

What condition is M-85 NB over Frank & Poet Drain 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 May 2024.

How much traffic does M-85 NB over Frank & Poet Drain carry?

About 15,575 vehicles per day (2014 count), of which roughly 7% are trucks.

How long is M-85 NB over Frank & Poet Drain?

The structure is 55 ft (16.8 m) long with a longest span of 55 ft (16.8 m) and a deck 46 ft wide.

Who owns M-85 NB over Frank & Poet Drain?

It is owned by the State Highway Agency.