US Bridges

Is 170 W over Rp Frost Ave to IS170E

Fair

St. Louis County, Missouri · S 2 T 46 N R 6 E · Structure no. 2564

Built
1978
47 years old
Condition
Fair
inspected September 2024
Type
Slab
Concrete Continuous
Length
133 ft
3 main spans
Daily traffic
27,257
2024 count
Owner
State
State Highway Agency

About this bridge

Is 170 W over Rp Frost Ave to IS170E is a concrete continuous slab carrying Is 170 W over Rp Frost Ave to IS170E in St. Louis County, Missouri. It was built in 1978, so it is 47 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 27,257 vehicles a day, roughly 18% of them trucks, projected to reach 34,071 by 2044. The structure is 133 ft (40.5 m) long and 42 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 170 W
CrossesRp Frost Ave to IS170E
LocationS 2 T 46 N R 6 E
RouteInterstate 170
CountySt. Louis County
StateMissouri
Coordinates38.76149, -90.33871
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating85.3 US tons
Inventory rating50.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length133 ft (40.5 m)
Longest span58 ft (17.7 m)
Deck width42 ft (12.9 m)
Roadway width39 ft (12 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic27,257 (2024)
Projected traffic34,071 by 2044
Trucks18%
Lanes on structure2
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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 170 W over Rp Frost Ave to IS170E built?

It was built in 1978, making it 47 years old in 2025.

What condition is Is 170 W over Rp Frost Ave to IS170E 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 September 2024.

How much traffic does Is 170 W over Rp Frost Ave to IS170E carry?

About 27,257 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Is 170 W over Rp Frost Ave to IS170E?

The structure is 133 ft (40.5 m) long with a longest span of 58 ft (17.7 m) and a deck 42 ft wide.

Who owns Is 170 W over Rp Frost Ave to IS170E?

It is owned by the State Highway Agency.