US Bridges

County RD #412 over Twelve Mile CR

Poor

Madison County, Missouri · S 12 T 31 N R 6 E · Structure no. 23520

Built
1985
40 years old
Condition
Poor
inspected December 2023
Type
Culvert
Concrete
Length
36 ft
3 main spans
Daily traffic
20
2024 count
Owner
County
County Highway Agency

About this bridge

County RD #412 over Twelve Mile CR is a concrete culvert carrying County RD #412 over Twelve Mile CR in Madison County, Missouri. It was built in 1985, so it is 40 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 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.

It carries about 20 vehicles a day, roughly 10% of them trucks, projected to reach 26 by 2044. The structure is 36 ft (11 m) long and 12 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

Location

Open in Google Maps
CarriesCounty RD #412
CrossesTwelve Mile CR
LocationS 12 T 31 N R 6 E
RouteCounty Highway 412
CountyMadison County
StateMissouri
Coordinates37.38229, -90.33832
Functional classRural Local

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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating54.6 US tons
Inventory rating17.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length36 ft (11 m)
Longest span12 ft (3.7 m)
Deck width12 ft (3.7 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20 (2024)
Projected traffic26 by 2044
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$225,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was County RD #412 over Twelve Mile CR built?

It was built in 1985, making it 40 years old in 2025.

What condition is County RD #412 over Twelve Mile CR 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 December 2023.

How much traffic does County RD #412 over Twelve Mile CR carry?

About 20 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD #412 over Twelve Mile CR?

The structure is 36 ft (11 m) long with a longest span of 12 ft (3.7 m) and a deck 12 ft wide.

Who owns County RD #412 over Twelve Mile CR?

It is owned by the County Highway Agency.