US Bridges

Cone RD over Milan-Macon Drain

Fair

Monroe County, Michigan · .35 MI E of Lenawee CO Li · Structure no. 000000000007260

Built
1970
55 years old
Condition
Fair
inspected October 2023
Type
Culvert
Concrete
Length
26 ft
2 main spans
Daily traffic
290
2016 count
Owner
County
County Highway Agency

About this bridge

Cone RD over Milan-Macon Drain is a concrete culvert carrying Cone RD over Milan-Macon Drain in Monroe County, Michigan. It was built in 1970, so it is 55 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 5 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 290 vehicles a day, roughly 3% of them trucks, projected to reach 334 by 2036. The structure is 26 ft (7.9 m) long. If it were closed, the detour would be 6.8 mi (11 km).

Location

Open in Google Maps
CarriesCone RD
CrossesMilan-Macon Drain
Location.35 MI E of Lenawee CO Li
RouteCounty Highway 0
CountyMonroe County
StateMichigan
Coordinates42.0317, -83.76589
Functional classRural 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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating60.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span12 ft (3.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic290 (2016)
Projected traffic334 by 2036
Trucks3%
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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Cone RD over Milan-Macon Drain built?

It was built in 1970, making it 55 years old in 2025.

What condition is Cone RD over Milan-Macon 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 October 2023.

How much traffic does Cone RD over Milan-Macon Drain carry?

About 290 vehicles per day (2016 count), of which roughly 3% are trucks.

How long is Cone RD over Milan-Macon Drain?

The structure is 26 ft (7.9 m) long with a longest span of 12 ft (3.6 m).

Who owns Cone RD over Milan-Macon Drain?

It is owned by the County Highway Agency.