US Bridges

Mid-County Exwy.Nb over Montgomery Avenue

Fair

Montgomery County, Pennsylvania · L. Merion 35A06 (3477-F2 · Structure no. 000000000027462

Built
1974
51 years old, rebuilt 1988
Condition
Fair
inspected December 2022
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
110 ft
1 main span
Daily traffic
51,844
2024 count
Owner
State
State Highway Agency

About this bridge

Mid-County Exwy.Nb over Montgomery Avenue is a prestressed concrete stringer/multi-beam or girder carrying Mid-County Exwy.Nb over Montgomery Avenue in Montgomery County, Pennsylvania. It was built in 1974 and reconstructed in 1988, so it is 51 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 51,844 vehicles a day, roughly 9% of them trucks, projected to reach 63,570 by 2032. The structure is 110 ft (33.5 m) long and 56 ft wide. If it were closed, the detour would be 0.6 mi (1 km).

Location

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CarriesMid-County Exwy.Nb
CrossesMontgomery Avenue
LocationL. Merion 35A06 (3477-F2
RouteInterstate 476
CountyMontgomery County
StatePennsylvania
Coordinates40.05457, -75.33778
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionDecember 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating78 US tons
Inventory rating28 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20 + Mod
Structure length110 ft (33.5 m)
Longest span105 ft (32 m)
Deck width56 ft (17.1 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic51,844 (2024)
Projected traffic63,570 by 2032
Trucks9%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed0.6 mi (1 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.Nb over Montgomery Avenue built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 1988.

What condition is Mid-County Exwy.Nb over Montgomery Avenue 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 December 2022.

How much traffic does Mid-County Exwy.Nb over Montgomery Avenue carry?

About 51,844 vehicles per day (2024 count), of which roughly 9% are trucks.

How long is Mid-County Exwy.Nb over Montgomery Avenue?

The structure is 110 ft (33.5 m) long with a longest span of 105 ft (32 m) and a deck 56 ft wide.

Who owns Mid-County Exwy.Nb over Montgomery Avenue?

It is owned by the State Highway Agency.