US Bridges

Is 170 E over Cst Clayton RD

Fair

St. Louis County, Missouri · S 16 T 45 N R 6 E · Structure no. 2414

Built
1968
57 years old, rebuilt 1986
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
95 ft
1 main span
Daily traffic
41,851
2024 count
Owner
State
State Highway Agency

About this bridge

Is 170 E over Cst Clayton RD is a steel stringer/multi-beam or girder carrying Is 170 E over Cst Clayton RD in St. Louis County, Missouri. It was built in 1968 and reconstructed in 1986, 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 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.

It carries about 41,851 vehicles a day, roughly 4% of them trucks, projected to reach 52,314 by 2044. The structure is 95 ft (29 m) long and 44 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 170 E
CrossesCst Clayton RD
LocationS 16 T 45 N R 6 E
RouteInterstate 170
CountySt. Louis County
StateMissouri
Coordinates38.63794, -90.34392
Functional classUrban Principal Arterial - Interstate

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 inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment7: Better than present minimum criteria
Operating rating73.4 US tons
Inventory rating43.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length95 ft (29 m)
Longest span90 ft (27.4 m)
Deck width44 ft (13.3 m)
Roadway width41 ft (12.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,851 (2024)
Projected traffic52,314 by 2044
Trucks4%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
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$1 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 170 E over Cst Clayton RD built?

It was built in 1968, making it 57 years old in 2025. It was reconstructed in 1986.

What condition is Is 170 E over Cst Clayton RD 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 October 2024.

How much traffic does Is 170 E over Cst Clayton RD carry?

About 41,851 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Is 170 E over Cst Clayton RD?

The structure is 95 ft (29 m) long with a longest span of 90 ft (27.4 m) and a deck 44 ft wide.

Who owns Is 170 E over Cst Clayton RD?

It is owned by the State Highway Agency.