US Bridges

Duenke RD over Trib of Mccoy CR

Fair

St. Charles County, Missouri · S 8 T 47 N R 1 E · Structure no. 12401

Built
1996
29 years old
Condition
Fair
inspected February 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
68 ft
1 main span
Daily traffic
314
2024 count
Owner
County
County Highway Agency

About this bridge

Duenke RD over Trib of Mccoy CR is a steel stringer/multi-beam or girder carrying Duenke RD over Trib of Mccoy CR in St. Charles County, Missouri. It was built in 1996, so it is 29 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 5 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 314 vehicles a day, roughly 1% of them trucks, projected to reach 487 by 2044. The structure is 68 ft (20.7 m) long and 30 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesDuenke RD
CrossesTrib of Mccoy CR
LocationS 8 T 47 N R 1 E
RouteCounty Highway 9
CountySt. Charles County
StateMissouri
Coordinates38.84335, -90.9248
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Channel and channel protection6 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
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating61.5 US tons
Inventory rating36.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadOther
Structure length68 ft (20.7 m)
Longest span65 ft (19.8 m)
Deck width30 ft (9.1 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic314 (2024)
Projected traffic487 by 2044
Trucks1%
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 Duenke RD over Trib of Mccoy CR built?

It was built in 1996, making it 29 years old in 2025.

What condition is Duenke RD over Trib of Mccoy 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 Duenke RD over Trib of Mccoy CR carry?

About 314 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Duenke RD over Trib of Mccoy CR?

The structure is 68 ft (20.7 m) long with a longest span of 65 ft (19.8 m) and a deck 30 ft wide.

Who owns Duenke RD over Trib of Mccoy CR?

It is owned by the County Highway Agency.