US Bridges

Rt T S over Dardenne CR

Fair

St. Charles County, Missouri · S 19 T 46 N R 1 E · Structure no. 9067

Built
1935
90 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
32 ft
3 main spans
Daily traffic
3,318
2024 count
Owner
State
State Highway Agency

About this bridge

Rt T S over Dardenne CR is a concrete continuous culvert carrying Rt T S over Dardenne CR in St. Charles County, Missouri. It was built in 1935, so it is 90 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.

It carries about 3,318 vehicles a day, roughly 14% of them trucks, projected to reach 6,470 by 2044. The structure is 32 ft (9.8 m) long and 29 ft wide. If it were closed, the detour would be 13 mi (21 km).

Location

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CarriesRt T S
CrossesDardenne CR
LocationS 19 T 46 N R 1 E
RouteState Highway 0T
CountySt. Charles County
StateMissouri
Coordinates38.73596, -90.96268
Functional classRural Major Collector

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 protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
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
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating39.7 US tons
Inventory rating23.8 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadH 10
Structure length32 ft (9.8 m)
Longest span11 ft (3.4 m)
Deck width29 ft (8.7 m)
Roadway width27 ft (8.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,318 (2024)
Projected traffic6,470 by 2044
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed13 mi (21 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$306,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Rt T S over Dardenne CR built?

It was built in 1935, making it 90 years old in 2025.

What condition is Rt T S over Dardenne 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 January 2025.

How much traffic does Rt T S over Dardenne CR carry?

About 3,318 vehicles per day (2024 count), of which roughly 14% are trucks.

How long is Rt T S over Dardenne CR?

The structure is 32 ft (9.8 m) long with a longest span of 11 ft (3.4 m) and a deck 29 ft wide.

Who owns Rt T S over Dardenne CR?

It is owned by the State Highway Agency.