US Bridges

County RD #417 over Twelve Mile CR

FairPosted for load

Madison County, Missouri · S 31 T 32 N R 7 E · Structure no. 14404

Built
1922
103 years old
Condition
Fair
inspected December 2023
Type
Truss - Thru
Steel
Length
84 ft
1 main span
Daily traffic
100
2024 count
Owner
County
County Highway Agency

About this bridge

County RD #417 over Twelve Mile CR is a steel truss - thru carrying County RD #417 over Twelve Mile CR in Madison County, Missouri. It was built in 1922, so it is 103 years old, older than the Missouri average of 45.1 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 130 by 2044. The structure is 84 ft (25.6 m) long and 21 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesCounty RD #417
CrossesTwelve Mile CR
LocationS 31 T 32 N R 7 E
RouteCounty Highway 66
CountyMadison County
StateMissouri
Coordinates37.41454, -90.31062
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating26.8 US tons
Inventory rating14.9 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length84 ft (25.6 m)
Longest span80 ft (24.4 m)
Deck width21 ft (6.4 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2024)
Projected traffic130 by 2044
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 County RD #417 over Twelve Mile CR built?

It was built in 1922, making it 103 years old in 2025.

What condition is County RD #417 over Twelve Mile CR 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 December 2023.

How much traffic does County RD #417 over Twelve Mile CR carry?

About 100 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is County RD #417 over Twelve Mile CR?

The structure is 84 ft (25.6 m) long with a longest span of 80 ft (24.4 m) and a deck 21 ft wide.

Who owns County RD #417 over Twelve Mile CR?

It is owned by the County Highway Agency.