US Bridges

Is 170 E over Rp IS170E to MO180E Rp

Fair

St. Louis County, Missouri · S 21 T 46 N R 6 E · Structure no. 2716

Built
1981
44 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
420 ft
3 main spans
Daily traffic
54,264
2024 count
Owner
State
State Highway Agency

About this bridge

Is 170 E over Rp IS170E to MO180E Rp is a steel continuous stringer/multi-beam or girder carrying Is 170 E over Rp IS170E to MO180E Rp in St. Louis County, Missouri. It was built in 1981, so it is 44 years old, younger 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 54,264 vehicles a day, roughly 4% of them trucks, projected to reach 67,830 by 2044. The structure is 420 ft (128 m) long and 59 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 170 E
CrossesRp IS170E to MO180E Rp
LocationS 21 T 46 N R 6 E
RouteInterstate 170
CountySt. Louis County
StateMissouri
Coordinates38.70511, -90.33988
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating64.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+4 approach)
Design loadHS 20 + Mod
Structure length420 ft (128 m)
Longest span112 ft (34.1 m)
Deck width59 ft (18.1 m)
Roadway width56 ft (17.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic54,264 (2024)
Projected traffic67,830 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 proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Is 170 E over Rp IS170E to MO180E Rp built?

It was built in 1981, making it 44 years old in 2025.

What condition is Is 170 E over Rp IS170E to MO180E Rp 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 E over Rp IS170E to MO180E Rp carry?

About 54,264 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Is 170 E over Rp IS170E to MO180E Rp?

The structure is 420 ft (128 m) long with a longest span of 112 ft (34.1 m) and a deck 59 ft wide.

Who owns Is 170 E over Rp IS170E to MO180E Rp?

It is owned by the State Highway Agency.