US Bridges

Union Ave over Trra RR

GoodPosted for load

St. Louis city, Missouri · S 32 T 46 N R 7 E · Structure no. 12991

Built
1988
37 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
72 ft
1 main span
Daily traffic
20,200
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Union Ave over Trra RR is a steel continuous stringer/multi-beam or girder carrying Union Ave over Trra RR in St. Louis city, Missouri. It was built in 1988, so it is 37 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 20,200 vehicles a day, roughly 5% of them trucks, projected to reach 27,270 by 2043. The structure is 72 ft (21.9 m) long and 75 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesUnion Ave
CrossesTrra RR
LocationS 32 T 46 N R 7 E
RouteCity Street 0
CountySt. Louis city
StateMissouri
Coordinates38.68555, -90.25337
Functional classUrban Minor Arterial

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 inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78.4 US tons
Inventory rating57.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span72 ft (21.9 m)
Deck width75 ft (23 m)
Roadway width64 ft (19.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic20,200 (2023)
Projected traffic27,270 by 2043
Trucks5%
Lanes on structure6
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$1.4 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was Union Ave over Trra RR built?

It was built in 1988, making it 37 years old in 2025.

What condition is Union Ave over Trra RR 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 March 2023.

How much traffic does Union Ave over Trra RR carry?

About 20,200 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Union Ave over Trra RR?

The structure is 72 ft (21.9 m) long with a longest span of 72 ft (21.9 m) and a deck 75 ft wide.

Who owns Union Ave over Trra RR?

It is owned by the City or Municipal Highway Agency.