US Bridges

SR 4006 Stone Br. over W Br Conococheague Creek

Poor

Franklin County, Pennsylvania · 1MI N of Willow Hill · Structure no. 000000000017579

Built
1907
118 years old
Condition
Poor
inspected March 2024
Type
Arch - Deck
Concrete
Length
108 ft
3 main spans
Daily traffic
518
2024 count
Owner
State
State Highway Agency

About this bridge

SR 4006 Stone Br. over W Br Conococheague Creek is a concrete arch - deck carrying SR 4006 Stone Br. over W Br Conococheague Creek in Franklin County, Pennsylvania. It was built in 1907, so it is 118 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 518 vehicles a day, roughly 10% of them trucks, projected to reach 788 by 2032. The structure is 108 ft (32.9 m) long and 15 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesSR 4006 Stone Br.
CrossesW Br Conococheague Creek
Location1MI N of Willow Hill
RouteState Highway 0
CountyFranklin County
StatePennsylvania
Coordinates40.12113, -77.7776
Functional classRural Local

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating40 US tons
Inventory rating24 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length108 ft (32.9 m)
Longest span45 ft (13.7 m)
Deck width15 ft (4.5 m)
Roadway width12 ft (3.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic518 (2024)
Projected traffic788 by 2032
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusListed on the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$727,000
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 4006 Stone Br. over W Br Conococheague Creek built?

It was built in 1907, making it 118 years old in 2025.

What condition is SR 4006 Stone Br. over W Br Conococheague Creek 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 March 2024.

How much traffic does SR 4006 Stone Br. over W Br Conococheague Creek carry?

About 518 vehicles per day (2024 count), of which roughly 10% are trucks.

How long is SR 4006 Stone Br. over W Br Conococheague Creek?

The structure is 108 ft (32.9 m) long with a longest span of 45 ft (13.7 m) and a deck 15 ft wide.

Who owns SR 4006 Stone Br. over W Br Conococheague Creek?

It is owned by the State Highway Agency.