US Bridges

SR 28 NB over SR.8 Nb/Sb N.Main RR Sp.

Good

Allegheny County, Pennsylvania · @ Etna Interchange · Structure no. 000000000000598

Built
1960
65 years old, rebuilt 2009
Condition
Good
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
876 ft
1 main span
Daily traffic
41,269
2024 count
Owner
State
State Highway Agency

About this bridge

SR 28 NB over SR.8 Nb/Sb N.Main RR Sp. is a steel stringer/multi-beam or girder carrying SR 28 NB over SR.8 Nb/Sb N.Main RR Sp. in Allegheny County, Pennsylvania. It was built in 1960 and reconstructed in 2009, so it is 65 years old, older 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 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 41,269 vehicles a day, roughly 15% of them trucks, projected to reach 25,741 by 2032. The structure is 876 ft (267 m) long and 35 ft wide.

Location

Open in Google Maps
CarriesSR 28 NB
CrossesSR.8 Nb/Sb N.Main RR Sp.
Location@ Etna Interchange
RouteState Highway 28
CountyAllegheny County
StatePennsylvania
Coordinates40.49581, -79.93927
Functional classUrban Principal Arterial - Other Freeway or Expressway

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.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum 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 rating84 US tons
Inventory rating65 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+10 approach)
Design loadHL 93
Structure length876 ft (267 m)
Longest span118 ft (36 m)
Deck width35 ft (10.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic41,269 (2024)
Projected traffic25,741 by 2032
Trucks15%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway, waterway and railroad
Detour if closed—
TollOn a free road
National Highway SystemYes

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$994,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 28 NB over SR.8 Nb/Sb N.Main RR Sp. built?

It was built in 1960, making it 65 years old in 2025. It was reconstructed in 2009.

What condition is SR 28 NB over SR.8 Nb/Sb N.Main RR Sp. 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 April 2024.

How much traffic does SR 28 NB over SR.8 Nb/Sb N.Main RR Sp. carry?

About 41,269 vehicles per day (2024 count), of which roughly 15% are trucks.

How long is SR 28 NB over SR.8 Nb/Sb N.Main RR Sp.?

The structure is 876 ft (267 m) long with a longest span of 118 ft (36 m) and a deck 35 ft wide.

Who owns SR 28 NB over SR.8 Nb/Sb N.Main RR Sp.?

It is owned by the State Highway Agency.