US Bridges

SR 646-PA 646 over Pennbrook Run

Fair

McKean County, Pennsylvania · Gilmore · Structure no. 000000000025458

Built
1930
95 years old
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
40 ft
2 main spans
Daily traffic
1,044
2024 count
Owner
State
State Highway Agency

About this bridge

SR 646-PA 646 over Pennbrook Run is a concrete slab 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 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 1,044 vehicles a day, roughly 6% of them trucks, projected to reach 1,741 by 2043. The structure is 40 ft (12.2 m) long and 32 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
LocationGilmore
RouteState Highway 646
CountyMcKean County
StatePennsylvania
Coordinates41.97318, -78.5645
Functional classRural Major Collector

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 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 evaluation5: Somewhat better than minimum adequacy to tolerate being 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 rating67 US tons
Inventory rating42 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckNot applicable
Main spans2
Design loadH 15
Structure length40 ft (12.2 m)
Longest span18 ft (5.5 m)
Deck width32 ft (9.9 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$656,000
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 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 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 40 ft (12.2 m) long with a longest span of 18 ft (5.5 m) and a deck 32 ft wide.

Who owns SR 646-PA 646 over Pennbrook Run?

It is owned by the State Highway Agency.