US Bridges

Library RD over Saw Mill Run

Good

Allegheny County, Pennsylvania · 300N.E. of Mcneilly RD · Structure no. 000000000041841

Built
2003
22 years old
Condition
Good
inspected October 2022
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
38 ft
1 main span
Daily traffic
21,171
2023 count
Owner
State
State Highway Agency

About this bridge

Library RD over Saw Mill Run is a prestressed concrete box beam or girders - multiple carrying Library RD over Saw Mill Run in Allegheny County, Pennsylvania. It was built in 2003, so it is 22 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 21,171 vehicles a day, roughly 4% of them trucks, projected to reach 19,497 by 2032. The structure is 38 ft (11.6 m) long and 33 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesLibrary RD
CrossesSaw Mill Run
Location300N.E. of Mcneilly RD
RouteState Highway 88
CountyAllegheny County
StatePennsylvania
Coordinates40.3786, -80.00254
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2022
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating97 US tons
Inventory rating42 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length38 ft (11.6 m)
Longest span36 ft (11 m)
Deck width33 ft (10.1 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic21,171 (2023)
Projected traffic19,497 by 2032
Trucks4%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Library RD over Saw Mill Run built?

It was built in 2003, making it 22 years old in 2025.

What condition is Library RD over Saw Mill Run 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 October 2022.

How much traffic does Library RD over Saw Mill Run carry?

About 21,171 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is Library RD over Saw Mill Run?

The structure is 38 ft (11.6 m) long with a longest span of 36 ft (11 m) and a deck 33 ft wide.

Who owns Library RD over Saw Mill Run?

It is owned by the State Highway Agency.