US Bridges

Is 170 E over Cst Woodson RD

Fair

St. Louis County, Missouri · S 32 T 46 N R 6 E · Structure no. 2423

Built
1968
57 years old, rebuilt 1983
Condition
Fair
inspected October 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
132 ft
3 main spans
Daily traffic
97,246
2024 count
Owner
State
State Highway Agency

About this bridge

Is 170 E over Cst Woodson RD is a steel stringer/multi-beam or girder carrying Is 170 E over Cst Woodson RD 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 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.

It carries about 97,246 vehicles a day, roughly 4% of them trucks, projected to reach 121,558 by 2044. The structure is 132 ft (40.2 m) long and 110 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 170 E
CrossesCst Woodson RD
LocationS 32 T 46 N R 6 E
RouteInterstate 170
CountySt. Louis County
StateMissouri
Coordinates38.68098, -90.35713
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating66.5 US tons
Inventory rating39.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length132 ft (40.2 m)
Longest span71 ft (21.5 m)
Deck width110 ft (33.4 m)
Roadway width107 ft (32.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic97,246 (2024)
Projected traffic121,558 by 2044
Trucks4%
Lanes on structure6
Traffic directionTwo-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$2.6 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 170 E over Cst Woodson RD built?

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

What condition is Is 170 E over Cst Woodson 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 Woodson RD carry?

About 97,246 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Is 170 E over Cst Woodson RD?

The structure is 132 ft (40.2 m) long with a longest span of 71 ft (21.5 m) and a deck 110 ft wide.

Who owns Is 170 E over Cst Woodson RD?

It is owned by the State Highway Agency.