US Bridges

Forbes Avenue over Fern Hollow Creek

Good

Allegheny County, Pennsylvania · 301033 near S Braddock Av · Structure no. 000000000068913

Built
2022
3 years old
Condition
Good
inspected February 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
464 ft
3 main spans
Daily traffic
15,000
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Forbes Avenue over Fern Hollow Creek is a prestressed concrete continuous stringer/multi-beam or girder carrying Forbes Avenue over Fern Hollow Creek in Allegheny County, Pennsylvania. It was built in 2022, so it is 3 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 15,000 vehicles a day, roughly 7% of them trucks, projected to reach 18,000 by 2042. The structure is 464 ft (141.4 m) long and 64 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesForbes Avenue
CrossesFern Hollow Creek
Location301033 near S Braddock Av
RouteCity Street 0
Coordinates40.43952, -79.90033
Functional classUrban Other Principal Arterial

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 protection8 Very GoodNo problems noted.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating54.2 US tons
Inventory rating41.8 US tons

Structure

MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length464 ft (141.4 m)
Longest span154 ft (46.9 m)
Deck width64 ft (19.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,000 (2022)
Projected traffic18,000 by 2042
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Forbes Avenue over Fern Hollow Creek built?

It was built in 2022, making it 3 years old in 2025.

What condition is Forbes Avenue over Fern Hollow Creek 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 February 2023.

How much traffic does Forbes Avenue over Fern Hollow Creek carry?

About 15,000 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is Forbes Avenue over Fern Hollow Creek?

The structure is 464 ft (141.4 m) long with a longest span of 154 ft (46.9 m) and a deck 64 ft wide.

Who owns Forbes Avenue over Fern Hollow Creek?

It is owned by the City or Municipal Highway Agency.