US Bridges

Coal Bank RD over Watkins CR

FairPosted for load

St. Louis County, Missouri · S 36 T 47 N R 7 E · Structure no. 15531

Built
1902
123 years old, rebuilt 1961
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
11
2024 count
Owner
County
County Highway Agency

About this bridge

Coal Bank RD over Watkins CR is a prestressed concrete box beam or girders - multiple carrying Coal Bank RD over Watkins CR in St. Louis County, Missouri. It was built in 1902 and reconstructed in 1961, so it is 123 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 5 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 11 vehicles a day, roughly 7% of them trucks, projected to reach 15 by 2044. The structure is 30 ft (9.1 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesCoal Bank RD
CrossesWatkins CR
LocationS 36 T 47 N R 7 E
RouteCounty Highway 0
Coordinates38.77231, -90.18524
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
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 adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.7 US tons
Inventory rating24.8 US tons

Structure

MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span26 ft (7.9 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11 (2024)
Projected traffic15 by 2044
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Coal Bank RD over Watkins CR built?

It was built in 1902, making it 123 years old in 2025. It was reconstructed in 1961.

What condition is Coal Bank RD over Watkins 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 Coal Bank RD over Watkins CR carry?

About 11 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Coal Bank RD over Watkins CR?

The structure is 30 ft (9.1 m) long with a longest span of 26 ft (7.9 m) and a deck 24 ft wide.

Who owns Coal Bank RD over Watkins CR?

It is owned by the County Highway Agency.