US Bridges

Pa 764 over Spencer Run

Fair

Blair County, Pennsylvania · 1.5 Mi.N.Of Duncansville · Structure no. 000000000005643

Built
1955
70 years old, rebuilt 2018
Condition
Fair
inspected June 2024
Type
Slab
Prestressed Concrete
Length
30 ft
1 main span
Daily traffic
9,491
2023 count
Owner
State
State Highway Agency

About this bridge

Pa 764 over Spencer Run is a prestressed concrete slab carrying Pa 764 over Spencer Run in Blair County, Pennsylvania. It was built in 1955 and reconstructed in 2018, so it is 70 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 6 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 9,491 vehicles a day, roughly 9% of them trucks, projected to reach 17,700 by 2032. The structure is 30 ft (9.1 m) long and 115 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesPa 764
CrossesSpencer Run
Location1.5 Mi.N.Of Duncansville
RouteState Highway 764
CountyBlair County
StatePennsylvania
Coordinates40.44667, -78.43333
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating74 US tons
Inventory rating33 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length30 ft (9.1 m)
Longest span27 ft (8.2 m)
Deck width115 ft (35.2 m)
Roadway width111 ft (33.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,491 (2023)
Projected traffic17,700 by 2032
Trucks9%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
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—
NavigationNo navigation control on waterway

Frequently asked questions

When was Pa 764 over Spencer Run built?

It was built in 1955, making it 70 years old in 2025. It was reconstructed in 2018.

What condition is Pa 764 over Spencer 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 June 2024.

How much traffic does Pa 764 over Spencer Run carry?

About 9,491 vehicles per day (2023 count), of which roughly 9% are trucks.

How long is Pa 764 over Spencer Run?

The structure is 30 ft (9.1 m) long with a longest span of 27 ft (8.2 m) and a deck 115 ft wide.

Who owns Pa 764 over Spencer Run?

It is owned by the State Highway Agency.