US Bridges

Is 170 E over Rvr Des Peres

Poor

St. Louis County, Missouri · S 29 T 46 N R 6 E · Structure no. 2424

Built
1968
57 years old
Condition
Poor
inspected November 2023
Type
Culvert
Concrete Continuous
Length
56 ft
3 main spans
Daily traffic
97,246
2024 count
Owner
State
State Highway Agency

About this bridge

Is 170 E over Rvr Des Peres is a concrete continuous culvert carrying Is 170 E over Rvr Des Peres in St. Louis County, Missouri. It was built in 1968, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 97,246 vehicles a day, roughly 4% of them trucks, projected to reach 121,558 by 2044. The structure is 56 ft (17.1 m) long. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesIs 170 E
CrossesRvr Des Peres
LocationS 29 T 46 N R 6 E
RouteInterstate 170
CountySt. Louis County
StateMissouri
Coordinates38.68139, -90.35657
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating79.4 US tons
Inventory rating47.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans3
Design loadHS 20 + Mod
Structure length56 ft (17.1 m)
Longest span15 ft (4.6 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 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
CrossesWaterway
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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$450,000 (2025 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Is 170 E over Rvr Des Peres built?

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

What condition is Is 170 E over Rvr Des Peres in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in November 2023.

How much traffic does Is 170 E over Rvr Des Peres carry?

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

How long is Is 170 E over Rvr Des Peres?

The structure is 56 ft (17.1 m) long with a longest span of 15 ft (4.6 m).

Who owns Is 170 E over Rvr Des Peres?

It is owned by the State Highway Agency.