US Bridges

Country Knoll DR over Duckett CR

Fair

St. Charles County, Missouri · S 22 T 46 N R 4 E · Structure no. 24077

Built
1993
32 years old
Condition
Fair
inspected February 2024
Type
Culvert
Concrete
Length
21 ft
2 main spans
Daily traffic
714
2024 count
Owner
County
County Highway Agency

About this bridge

Country Knoll DR over Duckett CR is a concrete culvert carrying Country Knoll DR over Duckett CR in St. Charles County, Missouri. It was built in 1993, so it is 32 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 714 vehicles a day, roughly 5% of them trucks, projected to reach 1,107 by 2044. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesCountry Knoll DR
CrossesDuckett CR
LocationS 22 T 46 N R 4 E
RouteCounty Highway 0
CountySt. Charles County
StateMissouri
Coordinates38.73954, -90.56827
Functional classUrban 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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.7 US tons
Inventory rating20.8 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadOther
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic714 (2024)
Projected traffic1,107 by 2044
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 Country Knoll DR over Duckett CR built?

It was built in 1993, making it 32 years old in 2025.

What condition is Country Knoll DR over Duckett 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 February 2024.

How much traffic does Country Knoll DR over Duckett CR carry?

About 714 vehicles per day (2024 count), of which roughly 5% are trucks.

How long is Country Knoll DR over Duckett CR?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns Country Knoll DR over Duckett CR?

It is owned by the County Highway Agency.