US Bridges

Pa Tpk (I-476) over Br. Towamencin Crk

Fair

Montgomery County, Pennsylvania · Near Lansdale · Structure no. 000000000028255

Built
1955
70 years old
Condition
Fair
inspected August 2024
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
65,329
2004 count
Owner
Toll Authority
State Toll Authority

About this bridge

Pa Tpk (I-476) over Br. Towamencin Crk is a concrete culvert carrying Pa Tpk (I-476) over Br. Towamencin Crk 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 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 65,329 vehicles a day, roughly 16% of them trucks, projected to reach 94,986 by 2030. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 8.7 mi (14 km).

Location

Open in Google Maps
CarriesPa Tpk (I-476)
CrossesBr. Towamencin Crk
LocationNear Lansdale
RouteInterstate 476
CountyMontgomery County
StatePennsylvania
Coordinates40.23535, -75.33849
Functional classRural Principal Arterial - Interstate

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length24 ft (7.3 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 traffic65,329 (2004)
Projected traffic94,986 by 2030
Trucks16%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.7 mi (14 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. Towamencin Crk built?

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

What condition is Pa Tpk (I-476) over Br. Towamencin Crk 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 August 2024.

How much traffic does Pa Tpk (I-476) over Br. Towamencin Crk carry?

About 65,329 vehicles per day (2004 count), of which roughly 16% are trucks.

How long is Pa Tpk (I-476) over Br. Towamencin Crk?

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

Who owns Pa Tpk (I-476) over Br. Towamencin Crk?

It is owned by the State Toll Authority.