US Bridges

18th Street over Penn Ctr Undrgrnd ST Sys

Fair

Philadelphia County, Pennsylvania · N of Market Street 28E12 · Structure no. 000000000039113

Built
1957
68 years old
Condition
Fair
inspected February 2023
Type
Girder and Floorbeam System
Steel
Length
50 ft
1 main span
Daily traffic
11,000
1985 count
Owner
City
City or Municipal Highway Agency

About this bridge

18th Street over Penn Ctr Undrgrnd ST Sys is a steel girder and floorbeam system carrying 18th Street over Penn Ctr Undrgrnd ST Sys in Philadelphia County, Pennsylvania. It was built in 1957, so it is 68 years old, older than the Pennsylvania average of 54.8 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 11,000 vehicles a day, projected to reach 15,400 by 2005. The structure is 50 ft (15.2 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

Open in Google Maps
Carries18th Street
CrossesPenn Ctr Undrgrnd ST Sys
LocationN of Market Street 28E12
RouteCity Street 0
CountyPhiladelphia County
StatePennsylvania
Coordinates39.95447, -75.16974
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating45 US tons
Inventory rating27 US tons

Structure

Structure typeGirder and Floorbeam System
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length50 ft (15.2 m)
Longest span50 ft (15.2 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (1985)
Projected traffic15,400 by 2005
Trucks—
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway and pedestrian
CrossesHighway
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$1.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was 18th Street over Penn Ctr Undrgrnd ST Sys built?

It was built in 1957, making it 68 years old in 2025.

What condition is 18th Street over Penn Ctr Undrgrnd ST Sys 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 February 2023.

How much traffic does 18th Street over Penn Ctr Undrgrnd ST Sys carry?

About 11,000 vehicles per day (1985 count).

How long is 18th Street over Penn Ctr Undrgrnd ST Sys?

The structure is 50 ft (15.2 m) long with a longest span of 50 ft (15.2 m).

Who owns 18th Street over Penn Ctr Undrgrnd ST Sys?

It is owned by the City or Municipal Highway Agency.