US Bridges

Pa Tpk (I-276) over Trib. Diamond Run

Fair

Montgomery County, Pennsylvania · South of Norristown · Structure no. 000000000028152

Built
1954
71 years old, rebuilt 2008
Condition
Fair
inspected May 2024
Type
Culvert
Concrete
Length
24 ft
1 main span
Daily traffic
65,138
2004 count
Owner
Toll Authority
State Toll Authority

About this bridge

Pa Tpk (I-276) over Trib. Diamond Run is a concrete culvert carrying Pa Tpk (I-276) over Trib. Diamond Run in Montgomery County, Pennsylvania. It was built in 1954 and reconstructed in 2008, so it is 71 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 65,138 vehicles a day, roughly 12% of them trucks, projected to reach 98,418 by 2030. The structure is 24 ft (7.3 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesPa Tpk (I-276)
CrossesTrib. Diamond Run
LocationSouth of Norristown
RouteInterstate 276
CountyMontgomery County
StatePennsylvania
Coordinates40.09689, -75.34189
Functional classUrban 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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating39 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans1
Design loadHS 20
Structure length24 ft (7.3 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic65,138 (2004)
Projected traffic98,418 by 2030
Trucks12%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$312,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Pa Tpk (I-276) over Trib. Diamond Run built?

It was built in 1954, making it 71 years old in 2025. It was reconstructed in 2008.

What condition is Pa Tpk (I-276) over Trib. Diamond Run 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 May 2024.

How much traffic does Pa Tpk (I-276) over Trib. Diamond Run carry?

About 65,138 vehicles per day (2004 count), of which roughly 12% are trucks.

How long is Pa Tpk (I-276) over Trib. Diamond Run?

The structure is 24 ft (7.3 m) long with a longest span of 16 ft (4.9 m).

Who owns Pa Tpk (I-276) over Trib. Diamond Run?

It is owned by the State Toll Authority.