US Bridges

Pa Tpk (I-276) over Septa; Frog Run

Good

Montgomery County, Pennsylvania · South of Norristown · Structure no. 000000000046819

Built
2006
19 years old
Condition
Good
inspected July 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
255 ft
2 main spans
Daily traffic
21,117
2010 count
Owner
Toll Authority
State Toll Authority

About this bridge

Pa Tpk (I-276) over Septa; Frog Run is a prestressed concrete continuous stringer/multi-beam or girder carrying Pa Tpk (I-276) over Septa; Frog Run in Montgomery County, Pennsylvania. It was built in 2006, so it is 19 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 21,117 vehicles a day, roughly 25% of them trucks, projected to reach 29,008 by 2030. The structure is 255 ft (77.7 m) long and 115 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesPa Tpk (I-276)
CrossesSepta; Frog Run
LocationSouth of Norristown
RouteInterstate 276
CountyMontgomery County
StatePennsylvania
Coordinates40.08837, -75.35313
Functional classUrban 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
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection9 ExcellentNo problems noted.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating101 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHL 93
Structure length255 ft (77.7 m)
Longest span125 ft (38.1 m)
Deck width115 ft (35.2 m)
Roadway width109 ft (33.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,117 (2010)
Projected traffic29,008 by 2030
Trucks25%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad and waterway
Detour if closed1.9 mi (3 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-276) over Septa; Frog Run built?

It was built in 2006, making it 19 years old in 2025.

What condition is Pa Tpk (I-276) over Septa; Frog Run 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 July 2023.

How much traffic does Pa Tpk (I-276) over Septa; Frog Run carry?

About 21,117 vehicles per day (2010 count), of which roughly 25% are trucks.

How long is Pa Tpk (I-276) over Septa; Frog Run?

The structure is 255 ft (77.7 m) long with a longest span of 125 ft (38.1 m) and a deck 115 ft wide.

Who owns Pa Tpk (I-276) over Septa; Frog Run?

It is owned by the State Toll Authority.