US Bridges

Mid-County Exwy. over Norfolk Southern

Fair

Montgomery County, Pennsylvania · Norristown Exit 25 29H10 · Structure no. 000000000027491

Built
1990
35 years old
Condition
Fair
inspected November 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
87 ft
1 main span
Daily traffic
100,836
2024 count
Owner
State
State Highway Agency

About this bridge

Mid-County Exwy. over Norfolk Southern is a prestressed concrete box beam or girders - multiple carrying Mid-County Exwy. over Norfolk Southern in Montgomery County, Pennsylvania. It was built in 1990, so it is 35 years old, younger 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 100,836 vehicles a day, roughly 10% of them trucks, projected to reach 122,461 by 2032. The structure is 87 ft (26.5 m) long and 419 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMid-County Exwy.
CrossesNorfolk Southern
LocationNorristown Exit 25 29H10
RouteInterstate 476
CountyMontgomery County
StatePennsylvania
Coordinates40.10708, -75.28691
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating84 US tons
Inventory rating47 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckNot applicable
Main spans1
Design loadHS 25 or greater
Structure length87 ft (26.5 m)
Longest span85 ft (25.9 m)
Deck width419 ft (127.7 m)
Roadway width177 ft (53.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100,836 (2024)
Projected traffic122,461 by 2032
Trucks10%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesRailroad
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 Mid-County Exwy. over Norfolk Southern built?

It was built in 1990, making it 35 years old in 2025.

What condition is Mid-County Exwy. over Norfolk Southern 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 November 2023.

How much traffic does Mid-County Exwy. over Norfolk Southern carry?

About 100,836 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is Mid-County Exwy. over Norfolk Southern?

The structure is 87 ft (26.5 m) long with a longest span of 85 ft (25.9 m) and a deck 419 ft wide.

Who owns Mid-County Exwy. over Norfolk Southern?

It is owned by the State Highway Agency.