US Bridges

Rp IS170W to IS70W over Is 170

Fair

St. Louis County, Missouri · S 656 T 46 N R 6 E · Structure no. 2571

Built
1981
44 years old
Condition
Fair
inspected March 2023
Type
Girder and Floorbeam System
Steel Continuous
Length
270 ft
3 main spans
Daily traffic
11,193
2024 count
Owner
State
State Highway Agency

About this bridge

Rp IS170W to IS70W over Is 170 is a steel continuous girder and floorbeam system carrying Rp IS170W to IS70W over Is 170 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 11,193 vehicles a day, roughly 18% of them trucks, projected to reach 13,991 by 2044. The structure is 270 ft (82.3 m) long and 28 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesRp IS170W to IS70W
CrossesIs 170
LocationS 656 T 46 N R 6 E
RouteState Highway 0
CountySt. Louis County
StateMissouri
Coordinates38.73007, -90.33276
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
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 geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating69.4 US tons
Inventory rating41.7 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20 + Mod
Structure length270 ft (82.3 m)
Longest span131 ft (39.8 m)
Deck width28 ft (8.6 m)
Roadway width25 ft (7.6 m)
Vertical clearance over deck17 ft (5.2 m)

Traffic and service

Average daily traffic11,193 (2024)
Projected traffic13,991 by 2044
Trucks18%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

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 Rp IS170W to IS70W over Is 170 built?

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

What condition is Rp IS170W to IS70W over Is 170 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 March 2023.

How much traffic does Rp IS170W to IS70W over Is 170 carry?

About 11,193 vehicles per day (2024 count), of which roughly 18% are trucks.

How long is Rp IS170W to IS70W over Is 170?

The structure is 270 ft (82.3 m) long with a longest span of 131 ft (39.8 m) and a deck 28 ft wide.

Who owns Rp IS170W to IS70W over Is 170?

It is owned by the State Highway Agency.