US Bridges

West Rock Creek RD over Mo 21

FairPosted for load

Jefferson County, Missouri · S 28 T 43 N R 5 E · Structure no. 2664

Built
1987
38 years old
Condition
Fair
inspected November 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
288 ft
2 main spans
Daily traffic
2,238
2024 count
Owner
State
State Highway Agency

About this bridge

West Rock Creek RD over Mo 21 is a steel continuous stringer/multi-beam or girder carrying West Rock Creek RD over Mo 21 in Jefferson County, Missouri. It was built in 1987, so it is 38 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. Its operating status is: posted for load restriction.

It carries about 2,238 vehicles a day, roughly 2% of them trucks, projected to reach 4,028 by 2044. The structure is 288 ft (87.8 m) long and 37 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesWest Rock Creek RD
CrossesMo 21
LocationS 28 T 43 N R 5 E
RouteCounty Highway 0
CountyJefferson County
StateMissouri
Coordinates38.43774, -90.46208
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating43.7 US tons
Inventory rating25.8 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length288 ft (87.8 m)
Longest span120 ft (36.6 m)
Deck width37 ft (11.2 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,238 (2024)
Projected traffic4,028 by 2044
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was West Rock Creek RD over Mo 21 built?

It was built in 1987, making it 38 years old in 2025.

What condition is West Rock Creek RD over Mo 21 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 November 2024.

How much traffic does West Rock Creek RD over Mo 21 carry?

About 2,238 vehicles per day (2024 count), of which roughly 2% are trucks.

How long is West Rock Creek RD over Mo 21?

The structure is 288 ft (87.8 m) long with a longest span of 120 ft (36.6 m) and a deck 37 ft wide.

Who owns West Rock Creek RD over Mo 21?

It is owned by the State Highway Agency.