US Bridges

Lilac Ave S over Is 270

FairPosted for load

St. Louis County, Missouri · S 35 T 47 N R 7 E · Structure no. 188

Built
1961
64 years old
Condition
Fair
inspected August 2024
Type
Slab
Concrete Continuous
Length
208 ft
4 main spans
Daily traffic
7,324
2024 count
Owner
State
State Highway Agency

About this bridge

Lilac Ave S over Is 270 is a concrete continuous slab carrying Lilac Ave S over Is 270 in St. Louis County, Missouri. It was built in 1961, so it is 64 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. Its operating status is: posted for load restriction.

It carries about 7,324 vehicles a day, roughly 4% of them trucks, projected to reach 10,986 by 2044. The structure is 208 ft (63.4 m) long and 64 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesLilac Ave S
CrossesIs 270
LocationS 35 T 47 N R 7 E
RouteCounty Highway 0
CountySt. Louis County
StateMissouri
Coordinates38.76722, -90.20293
Functional classUrban Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating47.6 US tons
Inventory rating23.8 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length208 ft (63.4 m)
Longest span55 ft (16.8 m)
Deck width64 ft (19.4 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,324 (2024)
Projected traffic10,986 by 2044
Trucks4%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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 Lilac Ave S over Is 270 built?

It was built in 1961, making it 64 years old in 2025.

What condition is Lilac Ave S over Is 270 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 August 2024.

How much traffic does Lilac Ave S over Is 270 carry?

About 7,324 vehicles per day (2024 count), of which roughly 4% are trucks.

How long is Lilac Ave S over Is 270?

The structure is 208 ft (63.4 m) long with a longest span of 55 ft (16.8 m) and a deck 64 ft wide.

Who owns Lilac Ave S over Is 270?

It is owned by the State Highway Agency.