US Bridges

Hemlock Hollow RD over Sycamore Run

Fair

Allegheny County, Pennsylvania · 432002 0.1 MI N/ Hunt RD · Structure no. 000000000002591

Built
1950
75 years old, rebuilt 1978
Condition
Fair
inspected July 2023
Type
Slab
Concrete
Length
29 ft
1 main span
Daily traffic
5,000
2023 count
Owner
City
City or Municipal Highway Agency

About this bridge

Hemlock Hollow RD over Sycamore Run is a concrete slab carrying Hemlock Hollow RD over Sycamore Run in Allegheny County, Pennsylvania. It was built in 1950 and reconstructed in 1978, so it is 75 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 5,000 vehicles a day, roughly 9% of them trucks, projected to reach 5,250 by 2043. The structure is 29 ft (8.8 m) long and 24 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesHemlock Hollow RD
CrossesSycamore Run
Location432002 0.1 MI N/ Hunt RD
RouteCity Street 0
CountyAllegheny County
StatePennsylvania
Coordinates40.51161, -79.89239
Functional classUrban Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
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.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating84 US tons
Inventory rating50 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length29 ft (8.8 m)
Longest span26 ft (7.9 m)
Deck width24 ft (7.2 m)
Roadway width20 ft (6.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,000 (2023)
Projected traffic5,250 by 2043
Trucks9%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

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 proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$79,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Hemlock Hollow RD over Sycamore Run built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1978.

What condition is Hemlock Hollow RD over Sycamore Run 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 2023.

How much traffic does Hemlock Hollow RD over Sycamore Run carry?

About 5,000 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Hemlock Hollow RD over Sycamore Run?

The structure is 29 ft (8.8 m) long with a longest span of 26 ft (7.9 m) and a deck 24 ft wide.

Who owns Hemlock Hollow RD over Sycamore Run?

It is owned by the City or Municipal Highway Agency.