US Bridges

County RD SE 450 over W Coon CR

Fair

St. Clair County, Missouri · S 20 T 37 N R 25 W · Structure no. 22128

Built
1985
40 years old
Condition
Fair
inspected December 2023
Type
Tee Beam
Prestressed Concrete
Length
119 ft
3 main spans
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

County RD SE 450 over W Coon CR is a prestressed concrete tee beam carrying County RD SE 450 over W Coon CR in St. Clair 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 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.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 36 by 2043. The structure is 119 ft (36.3 m) long and 27 ft wide. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesCounty RD SE 450
CrossesW Coon CR
LocationS 20 T 37 N R 25 W
RouteCounty Highway 341
CountySt. Clair County
StateMissouri
Coordinates37.95479, -93.70305
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
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 statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.6 US tons
Inventory rating24.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadOther
Structure length119 ft (36.3 m)
Longest span39 ft (11.9 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic36 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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 SE 450 over W Coon CR built?

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

What condition is County RD SE 450 over W Coon 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 SE 450 over W Coon CR carry?

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is County RD SE 450 over W Coon CR?

The structure is 119 ft (36.3 m) long with a longest span of 39 ft (11.9 m) and a deck 27 ft wide.

Who owns County RD SE 450 over W Coon CR?

It is owned by the County Highway Agency.