US Bridges

Lenawee CO Line RD over Milan-Macon Drain

PoorPosted for load

Monroe County, Michigan · .3 MI N of Cone Road · Structure no. 000000000007254

Built
1929
96 years old
Condition
Poor
inspected October 2024
Type
Tee Beam
Concrete
Length
31 ft
1 main span
Daily traffic
110
2018 count
Owner
County
County Highway Agency

About this bridge

Lenawee CO Line RD over Milan-Macon Drain is a concrete tee beam carrying Lenawee CO Line RD over Milan-Macon Drain in Monroe County, Michigan. It was built in 1929, so it is 96 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: posted for load restriction.

It carries about 110 vehicles a day, roughly 14% of them trucks, projected to reach 126 by 2038. The structure is 31 ft (9.4 m) long and 28 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

CarriesLenawee CO Line RD
CrossesMilan-Macon Drain
Location.3 MI N of Cone Road
RouteCounty Highway 0
Coordinates42.03567, -83.77259
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure2 CriticalAdvanced deterioration of primary structural elements. Bridge may be closed until corrective action is taken.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 12 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating22.5 US tons
Inventory rating13.9 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length31 ft (9.4 m)
Longest span29 ft (8.8 m)
Deck width28 ft (8.6 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic110 (2018)
Projected traffic126 by 2038
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.8 mi (11 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 Lenawee CO Line RD over Milan-Macon Drain built?

It was built in 1929, making it 96 years old in 2025.

What condition is Lenawee CO Line RD over Milan-Macon 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 2024.

How much traffic does Lenawee CO Line RD over Milan-Macon Drain carry?

About 110 vehicles per day (2018 count), of which roughly 14% are trucks.

How long is Lenawee CO Line RD over Milan-Macon Drain?

The structure is 31 ft (9.4 m) long with a longest span of 29 ft (8.8 m) and a deck 28 ft wide.

Who owns Lenawee CO Line RD over Milan-Macon Drain?

It is owned by the County Highway Agency.