US Bridges

Missouri Bottom RD over Cowmire CR

FairPosted for load

St. Louis County, Missouri · S 26 T 47 N R 5 E · Structure no. 15563

Built
1936
89 years old, rebuilt 1981
Condition
Fair
inspected February 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
41 ft
1 main span
Daily traffic
1,480
2024 count
Owner
County
County Highway Agency

About this bridge

Missouri Bottom RD over Cowmire CR is a prestressed concrete box beam or girders - multiple carrying Missouri Bottom RD over Cowmire CR in St. Louis County, Missouri. It was built in 1936 and reconstructed in 1981, so it is 89 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. Its operating status is: posted for load restriction.

It carries about 1,480 vehicles a day, roughly 3% of them trucks, projected to reach 1,998 by 2044. The structure is 41 ft (12.5 m) long and 20 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesMissouri Bottom RD
CrossesCowmire CR
LocationS 26 T 47 N R 5 E
RouteCounty Highway 0
CountySt. Louis County
StateMissouri
Coordinates38.78707, -90.4224
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
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 evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating25.8 US tons
Inventory rating18.8 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckOther
Main spans1
Design loadHS 20
Structure length41 ft (12.5 m)
Longest span37 ft (11.3 m)
Deck width20 ft (6.1 m)
Roadway width19 ft (5.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,480 (2024)
Projected traffic1,998 by 2044
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$348,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Missouri Bottom RD over Cowmire CR built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1981.

What condition is Missouri Bottom RD over Cowmire 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 Missouri Bottom RD over Cowmire CR carry?

About 1,480 vehicles per day (2024 count), of which roughly 3% are trucks.

How long is Missouri Bottom RD over Cowmire CR?

The structure is 41 ft (12.5 m) long with a longest span of 37 ft (11.3 m) and a deck 20 ft wide.

Who owns Missouri Bottom RD over Cowmire CR?

It is owned by the County Highway Agency.