US Bridges

ST Charles RD over Cedar CR

Fair

Boone County, Missouri · S 3 T 48 N R 11 W · Structure no. 21663

Built
1986
39 years old
Condition
Fair
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
103 ft
3 main spans
Daily traffic
25
2023 count
Owner
County
County Highway Agency

About this bridge

ST Charles RD over Cedar CR is a prestressed concrete tee beam carrying ST Charles RD over Cedar CR in Boone County, Missouri. It was built in 1986, so it is 39 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 25 vehicles a day, roughly 10% of them trucks, projected to reach 48 by 2043. The structure is 103 ft (31.4 m) long and 23 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesST Charles RD
CrossesCedar CR
LocationS 3 T 48 N R 11 W
RouteCounty Highway 317
CountyBoone County
StateMissouri
Coordinates38.97787, -92.14713
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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length103 ft (31.4 m)
Longest span40 ft (12.2 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic25 (2023)
Projected traffic48 by 2043
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 ST Charles RD over Cedar CR built?

It was built in 1986, making it 39 years old in 2025.

What condition is ST Charles RD over Cedar 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 2024.

How much traffic does ST Charles RD over Cedar CR carry?

About 25 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is ST Charles RD over Cedar CR?

The structure is 103 ft (31.4 m) long with a longest span of 40 ft (12.2 m) and a deck 23 ft wide.

Who owns ST Charles RD over Cedar CR?

It is owned by the County Highway Agency.