US Bridges

Pa Tpk (I-476) over Br.Skippack CR;NB-151

Good

Montgomery County, Pennsylvania · N of Lansdale Interchange · Structure no. 000000000028261

Built
1955
70 years old
Condition
Good
inspected September 2024
Type
Culvert
Concrete
Length
25 ft
1 main span
Daily traffic
50,307
2004 count
Owner
Toll Authority
State Toll Authority

About this bridge

Pa Tpk (I-476) over Br.Skippack CR;NB-151 is a concrete culvert carrying Pa Tpk (I-476) over Br.Skippack CR;NB-151 in Montgomery County, Pennsylvania. It was built in 1955, so it is 70 years old, older 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 50,307 vehicles a day, roughly 15% of them trucks, projected to reach 73,145 by 2030. The structure is 25 ft (7.6 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesPa Tpk (I-476)
CrossesBr.Skippack CR;NB-151
LocationN of Lansdale Interchange
RouteInterstate 476
CountyMontgomery County
StatePennsylvania
Coordinates40.2608, -75.35215
Functional classRural Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation7: Better than present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating98.9 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span24 ft (7.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50,307 (2004)
Projected traffic73,145 by 2030
Trucks15%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a toll road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

Ownership and planned work

OwnerState Toll Authority
Maintained byState Toll Authority
Historic statusHistorical significance not determinable at this time
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Pa Tpk (I-476) over Br.Skippack CR;NB-151 built?

It was built in 1955, making it 70 years old in 2025.

What condition is Pa Tpk (I-476) over Br.Skippack CR;NB-151 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 September 2024.

How much traffic does Pa Tpk (I-476) over Br.Skippack CR;NB-151 carry?

About 50,307 vehicles per day (2004 count), of which roughly 15% are trucks.

How long is Pa Tpk (I-476) over Br.Skippack CR;NB-151?

The structure is 25 ft (7.6 m) long with a longest span of 24 ft (7.3 m).

Who owns Pa Tpk (I-476) over Br.Skippack CR;NB-151?

It is owned by the State Toll Authority.