US Bridges

Lakefront DR over Unknown Lk

GoodPosted for load

St. Louis County, Missouri · S 33 T 47 N R 5 E · Structure no. 15677

Built
1989
36 years old
Condition
Good
inspected February 2024
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
2,912
2024 count
Owner
County
County Highway Agency

About this bridge

Lakefront DR over Unknown Lk is a concrete continuous culvert carrying Lakefront DR over Unknown Lk in St. Louis County, Missouri. It was built in 1989, so it is 36 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 2,912 vehicles a day, roughly 10% of them trucks, projected to reach 3,931 by 2044. The structure is 21 ft (6.4 m) long. If it were closed, the detour would be 0.6 mi (1 km).

CarriesLakefront DR
CrossesUnknown Lk
LocationS 33 T 47 N R 5 E
RouteCounty Highway 0
Coordinates38.76774, -90.45396
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98.2 US tons
Inventory rating47.6 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 25 or greater
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,912 (2024)
Projected traffic3,931 by 2044
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Lakefront DR over Unknown Lk built?

It was built in 1989, making it 36 years old in 2025.

What condition is Lakefront DR over Unknown Lk 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 February 2024.

How much traffic does Lakefront DR over Unknown Lk carry?

About 2,912 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Lakefront DR over Unknown Lk?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m).

Who owns Lakefront DR over Unknown Lk?

It is owned by the County Highway Agency.