US Bridges

SR 646-PA 646 over Pennbrook Run

Poor

McKean County, Pennsylvania · 1 MI N Gilmore · Structure no. 000000000025460

Built
1930
95 years old
Condition
Poor
inspected September 2023
Type
Tee Beam
Concrete
Length
30 ft
1 main span
Daily traffic
1,044
2024 count
Owner
State
State Highway Agency

About this bridge

SR 646-PA 646 over Pennbrook Run is a concrete tee beam carrying SR 646-PA 646 over Pennbrook Run in McKean County, Pennsylvania. It was built in 1930, so it is 95 years old, older than the Pennsylvania average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 1,044 vehicles a day, roughly 6% of them trucks, projected to reach 1,741 by 2043. The structure is 30 ft (9.1 m) long and 33 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesSR 646-PA 646
CrossesPennbrook Run
Location1 MI N Gilmore
RouteState Highway 646
CountyMcKean County
StatePennsylvania
Coordinates41.98204, -78.55044
Functional classRural Major Collector

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating35.1 US tons

Structure

Structure typeTee Beam
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadH 20
Structure length30 ft (9.1 m)
Longest span30 ft (9.1 m)
Deck width33 ft (10.1 m)
Roadway width29 ft (8.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,044 (2024)
Projected traffic1,741 by 2043
Trucks6%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 km)
TollOn a free road
National Highway SystemNo

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$335,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 646-PA 646 over Pennbrook Run built?

It was built in 1930, making it 95 years old in 2025.

What condition is SR 646-PA 646 over Pennbrook Run in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does SR 646-PA 646 over Pennbrook Run carry?

About 1,044 vehicles per day (2024 count), of which roughly 6% are trucks.

How long is SR 646-PA 646 over Pennbrook Run?

The structure is 30 ft (9.1 m) long with a longest span of 30 ft (9.1 m) and a deck 33 ft wide.

Who owns SR 646-PA 646 over Pennbrook Run?

It is owned by the State Highway Agency.