US Bridges

Lackland RD E over Is 170

GoodPosted for load

St. Louis County, Missouri · S 28 T 46 N R 6 E · Structure no. 3010

Built
1981
44 years old, rebuilt 2023
Condition
Good
inspected September 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
355 ft
4 main spans
Daily traffic
5,503
2024 count
Owner
State
State Highway Agency

About this bridge

Lackland RD E over Is 170 is a steel continuous stringer/multi-beam or girder carrying Lackland RD E over Is 170 in St. Louis County, Missouri. It was built in 1981 and reconstructed in 2023, 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 good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. Its operating status is: posted for load restriction.

It carries about 5,503 vehicles a day, roughly 9% of them trucks, projected to reach 8,255 by 2044. The structure is 355 ft (108.2 m) long and 50 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
CarriesLackland RD E
CrossesIs 170
LocationS 28 T 46 N R 6 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.69988, -90.34492
Functional classUrban Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.5 US tons
Inventory rating38.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length355 ft (108.2 m)
Longest span119 ft (36.3 m)
Deck width50 ft (15.1 m)
Roadway width47 ft (14.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,503 (2024)
Projected traffic8,255 by 2044
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Lackland RD E over Is 170 built?

It was built in 1981, making it 44 years old in 2025. It was reconstructed in 2023.

What condition is Lackland RD E over Is 170 in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2024.

How much traffic does Lackland RD E over Is 170 carry?

About 5,503 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Lackland RD E over Is 170?

The structure is 355 ft (108.2 m) long with a longest span of 119 ft (36.3 m) and a deck 50 ft wide.

Who owns Lackland RD E over Is 170?

It is owned by the State Highway Agency.