US Bridges

Conshohocken Road over U Merion & Plymouth RR

Good

Montgomery County, Pennsylvania · Plymouth Twp. 3367K06 · Structure no. 000000000045618

Built
2011
14 years old
Condition
Good
inspected April 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
44 ft
1 main span
Daily traffic
8,361
2024 count
Owner
State
State Highway Agency

About this bridge

Conshohocken Road over U Merion & Plymouth RR is a prestressed concrete box beam or girders - multiple carrying Conshohocken Road over U Merion & Plymouth RR in Montgomery County, Pennsylvania. It was built in 2011, so it is 14 years old, younger than the Pennsylvania average of 54.8 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.

It carries about 8,361 vehicles a day, roughly 22% of them trucks, projected to reach 9,664 by 2032. The structure is 44 ft (13.4 m) long and 52 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesConshohocken Road
CrossesU Merion & Plymouth RR
LocationPlymouth Twp. 3367K06
RouteState Highway 0
CountyMontgomery County
StatePennsylvania
Coordinates40.09163, -75.31687
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
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57.9 US tons
Inventory rating36.4 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length44 ft (13.4 m)
Longest span42 ft (12.8 m)
Deck width52 ft (15.7 m)
Roadway width35 ft (10.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,361 (2024)
Projected traffic9,664 by 2032
Trucks22%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway and railroad
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Conshohocken Road over U Merion & Plymouth RR built?

It was built in 2011, making it 14 years old in 2025.

What condition is Conshohocken Road over U Merion & Plymouth 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 April 2023.

How much traffic does Conshohocken Road over U Merion & Plymouth RR carry?

About 8,361 vehicles per day (2024 count), of which roughly 22% are trucks.

How long is Conshohocken Road over U Merion & Plymouth RR?

The structure is 44 ft (13.4 m) long with a longest span of 42 ft (12.8 m) and a deck 52 ft wide.

Who owns Conshohocken Road over U Merion & Plymouth RR?

It is owned by the State Highway Agency.