US Bridges

Is 44 W over Meramec Rvr South Outer

Poor

St. Louis County, Missouri · S 32 T 44 N R 4 E · Structure no. 1490

Built
1968
57 years old, rebuilt 1983
Condition
Poor
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,308 ft
15 main spans
Daily traffic
37,539
2024 count
Owner
State
State Highway Agency

About this bridge

Is 44 W over Meramec Rvr South Outer is a steel continuous stringer/multi-beam or girder carrying Is 44 W over Meramec Rvr South Outer in St. Louis County, Missouri. It was built in 1968 and reconstructed in 1983, so it is 57 years old, older than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 37,539 vehicles a day, roughly 12% of them trucks, projected to reach 46,924 by 2044. The structure is 1,308 ft (398.7 m) long and 41 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

CarriesIs 44 W
CrossesMeramec Rvr South Outer
LocationS 32 T 44 N R 4 E
RouteInterstate 44
Coordinates38.50424, -90.59203
Functional classRural Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating52.6 US tons
Inventory rating31.7 US tons

Structure

MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans15
Design loadHS 20 + Mod
Structure length1,308 ft (398.7 m)
Longest span150 ft (45.7 m)
Deck width41 ft (12.4 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic37,539 (2024)
Projected traffic46,924 by 2044
Trucks12%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and waterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$10.5 million (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Is 44 W over Meramec Rvr South Outer built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1983.

What condition is Is 44 W over Meramec Rvr South Outer in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in December 2023.

How much traffic does Is 44 W over Meramec Rvr South Outer carry?

About 37,539 vehicles per day (2024 count), of which roughly 12% are trucks.

How long is Is 44 W over Meramec Rvr South Outer?

The structure is 1,308 ft (398.7 m) long with a longest span of 150 ft (45.7 m) and a deck 41 ft wide.

Who owns Is 44 W over Meramec Rvr South Outer?

It is owned by the State Highway Agency.