US Bridges

18th ST over UP & Trra RR

FairPosted for load

St. Louis city, Missouri · S 23 T 45 N R 7 E · Structure no. 13134

Built
1986
39 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
729 ft
3 main spans
Daily traffic
14,500
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

18th ST over UP & Trra RR is a steel continuous stringer/multi-beam or girder carrying 18th ST over UP & Trra RR in St. Louis city, Missouri. It was built in 1986, so it is 39 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 5 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 14,500 vehicles a day, roughly 5% of them trucks, projected to reach 19,575 by 2043. The structure is 729 ft (222.2 m) long and 59 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries18th ST
CrossesUP & Trra RR
LocationS 23 T 45 N R 7 E
RouteCity Street 0
CountySt. Louis city
StateMissouri
Coordinates38.62391, -90.20803
Functional classUrban Minor Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
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 geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating62.5 US tons
Inventory rating37.7 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+5 approach)
Design loadHS 20 + Mod
Structure length729 ft (222.2 m)
Longest span137 ft (41.8 m)
Deck width59 ft (17.9 m)
Roadway width48 ft (14.6 m)
Vertical clearance over deck17 ft (5.1 m)

Traffic and service

Average daily traffic14,500 (2023)
Projected traffic19,575 by 2043
Trucks5%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed1.2 mi (2 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$7.5 million (2025 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was 18th ST over UP & Trra RR built?

It was built in 1986, making it 39 years old in 2025.

What condition is 18th ST over UP & Trra 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 March 2023.

How much traffic does 18th ST over UP & Trra RR carry?

About 14,500 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is 18th ST over UP & Trra RR?

The structure is 729 ft (222.2 m) long with a longest span of 137 ft (41.8 m) and a deck 59 ft wide.

Who owns 18th ST over UP & Trra RR?

It is owned by the City or Municipal Highway Agency.