US Bridges

Mount Airy Avenue over Septa;chestnut Hill Br.

Fair

Philadelphia County, Pennsylvania · .3MI.NE.GERMANTOWN3369K10 · Structure no. 000000000039080

Built
1939
86 years old, rebuilt 1976
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
53 ft
1 main span
Daily traffic
4,653
2024 count
Owner
State
State Highway Agency

About this bridge

Mount Airy Avenue over Septa;chestnut Hill Br. is a steel stringer/multi-beam or girder carrying Mount Airy Avenue over Septa;chestnut Hill Br. in Philadelphia County, Pennsylvania. It was built in 1939 and reconstructed in 1976, so it is 86 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 5 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 4,653 vehicles a day, roughly 1% of them trucks, projected to reach 8,339 by 2032. The structure is 53 ft (16.2 m) long and 46 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesMount Airy Avenue
CrossesSepta;chestnut Hill Br.
Location.3MI.NE.GERMANTOWN3369K10
RouteState Highway 0
CountyPhiladelphia County
StatePennsylvania
Coordinates40.06361, -75.18739
Functional classUrban Other Principal Arterial

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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating49.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length53 ft (16.2 m)
Longest span50 ft (15.2 m)
Deck width46 ft (13.9 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,653 (2024)
Projected traffic8,339 by 2032
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$690,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Mount Airy Avenue over Septa;chestnut Hill Br. built?

It was built in 1939, making it 86 years old in 2025. It was reconstructed in 1976.

What condition is Mount Airy Avenue over Septa;chestnut Hill Br. 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 July 2024.

How much traffic does Mount Airy Avenue over Septa;chestnut Hill Br. carry?

About 4,653 vehicles per day (2024 count), of which roughly 1% are trucks.

How long is Mount Airy Avenue over Septa;chestnut Hill Br.?

The structure is 53 ft (16.2 m) long with a longest span of 50 ft (15.2 m) and a deck 46 ft wide.

Who owns Mount Airy Avenue over Septa;chestnut Hill Br.?

It is owned by the State Highway Agency.