US Bridges

Clay Ave over UP RR

Fair

St. Louis County, Missouri · S 1 T 44 N R 5 E · Structure no. 19645

Built
1999
26 years old
Condition
Fair
inspected January 2024
Type
Truss - Thru
Steel
Length
94 ft
1 main span
Daily traffic
5,950
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Clay Ave over UP RR is a steel truss - thru carrying Clay Ave over UP RR in St. Louis County, Missouri. It was built in 1999, so it is 26 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 6 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 5,950 vehicles a day, roughly 2% of them trucks, projected to reach 8,033 by 2043. The structure is 94 ft (28.7 m) long and 27 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

Open in Google Maps
CarriesClay Ave
CrossesUP RR
LocationS 1 T 44 N R 5 E
RouteCity Street 0
CountySt. Louis County
StateMissouri
Coordinates38.58053, -90.40871
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.
Superstructure7 GoodSome minor problems.
Substructure8 Very GoodNo problems noted.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating60.5 US tons
Inventory rating35.7 US tons

Structure

Structure typeTruss - Thru
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length94 ft (28.7 m)
Longest span90 ft (27.4 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,950 (2023)
Projected traffic8,033 by 2043
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed0.6 mi (1 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$816,000 (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Clay Ave over UP RR built?

It was built in 1999, making it 26 years old in 2025.

What condition is Clay Ave over UP RR 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 January 2024.

How much traffic does Clay Ave over UP RR carry?

About 5,950 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Clay Ave over UP RR?

The structure is 94 ft (28.7 m) long with a longest span of 90 ft (27.4 m) and a deck 27 ft wide.

Who owns Clay Ave over UP RR?

It is owned by the City or Municipal Highway Agency.