US Bridges

Saw Mill Run Blvd over W Liberty Ave. SR 3069

Good

Allegheny County, Pennsylvania · 0.1 Mile S.Liberty Tunnel · Structure no. 000000000040674

Built
1999
26 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
188 ft
1 main span
Daily traffic
36,949
2024 count
Owner
State
State Highway Agency

About this bridge

Saw Mill Run Blvd over W Liberty Ave. SR 3069 is a steel stringer/multi-beam or girder carrying Saw Mill Run Blvd over W Liberty Ave. SR 3069 in Allegheny County, Pennsylvania. It was built in 1999, so it is 26 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 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 36,949 vehicles a day, roughly 6% of them trucks, projected to reach 53,922 by 2032. The structure is 188 ft (57.3 m) long and 85 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesSaw Mill Run Blvd
CrossesW Liberty Ave. SR 3069
Location0.1 Mile S.Liberty Tunnel
RouteState Highway 51
CountyAllegheny County
StatePennsylvania
Coordinates40.41405, -80.00965
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating68 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length188 ft (57.3 m)
Longest span181 ft (55.2 m)
Deck width85 ft (25.9 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic36,949 (2024)
Projected traffic53,922 by 2032
Trucks6%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$305,000
NavigationNot applicable (no waterway)

Frequently asked questions

When was Saw Mill Run Blvd over W Liberty Ave. SR 3069 built?

It was built in 1999, making it 26 years old in 2025.

What condition is Saw Mill Run Blvd over W Liberty Ave. SR 3069 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 May 2023.

How much traffic does Saw Mill Run Blvd over W Liberty Ave. SR 3069 carry?

About 36,949 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is Saw Mill Run Blvd over W Liberty Ave. SR 3069?

The structure is 188 ft (57.3 m) long with a longest span of 181 ft (55.2 m) and a deck 85 ft wide.

Who owns Saw Mill Run Blvd over W Liberty Ave. SR 3069?

It is owned by the State Highway Agency.