US Bridges

Milan Oakville RD over Thayer Drain

Fair

Monroe County, Michigan · 4.15 MI E of US 23 · Structure no. 000000000007282

Built
1980
45 years old
Condition
Fair
inspected October 2024
Type
Culvert
Concrete
Length
34 ft
2 main spans
Daily traffic
3,200
2017 count
Owner
County
County Highway Agency

About this bridge

Milan Oakville RD over Thayer Drain is a concrete culvert carrying Milan Oakville RD over Thayer Drain in Monroe County, Michigan. It was built in 1980, so it is 45 years old, younger 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 3,200 vehicles a day, roughly 2% of them trucks, projected to reach 3,680 by 2037. The structure is 34 ft (10.5 m) long. If it were closed, the detour would be 16.2 mi (26 km).

Location

Open in Google Maps
CarriesMilan Oakville RD
CrossesThayer Drain
Location4.15 MI E of US 23
RouteCounty Highway 5898
CountyMonroe County
StateMichigan
Coordinates42.08477, -83.59117
Functional classRural Minor 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
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 2024
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 adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating89.6 US tons
Inventory rating53.6 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length34 ft (10.5 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,200 (2017)
Projected traffic3,680 by 2037
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed16.2 mi (26 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 Milan Oakville RD over Thayer Drain built?

It was built in 1980, making it 45 years old in 2025.

What condition is Milan Oakville RD over Thayer 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 2024.

How much traffic does Milan Oakville RD over Thayer Drain carry?

About 3,200 vehicles per day (2017 count), of which roughly 2% are trucks.

How long is Milan Oakville RD over Thayer Drain?

The structure is 34 ft (10.5 m) long with a longest span of 14 ft (4.3 m).

Who owns Milan Oakville RD over Thayer Drain?

It is owned by the County Highway Agency.