US Bridges

County Line Road over Swamp Creek

PoorPosted for load

Montgomery County, Pennsylvania · .6 MI NE PA-100 2915-B6 · Structure no. 000000000028052

Built
1939
86 years old
Condition
Poor
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
51 ft
1 main span
Daily traffic
3,000
2015 count
Owner
Town / Township
Town or Township Highway Agency

About this bridge

County Line Road over Swamp Creek is a steel stringer/multi-beam or girder carrying County Line Road over Swamp Creek in Montgomery County, Pennsylvania. It was built in 1939, so it is 86 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. Its operating status is: posted for load restriction.

It carries about 3,000 vehicles a day, roughly 3% of them trucks, projected to reach 3,500 by 2035. The structure is 51 ft (15.5 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesCounty Line Road
CrossesSwamp Creek
Location.6 MI NE PA-100 2915-B6
RouteCity Street 0
CountyMontgomery County
StatePennsylvania
Coordinates40.34175, -75.6154
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
Deck4 PoorAdvanced section loss, deterioration, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusPosted for load 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 adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating26 US tons
Inventory rating15 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length51 ft (15.5 m)
Longest span40 ft (12.2 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,000 (2015)
Projected traffic3,500 by 2035
Trucks3%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerTown or Township Highway Agency
Maintained byTown or Township 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$129,000
NavigationNo navigation control on waterway

Frequently asked questions

When was County Line Road over Swamp Creek built?

It was built in 1939, making it 86 years old in 2025.

What condition is County Line Road over Swamp 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 May 2024.

How much traffic does County Line Road over Swamp Creek carry?

About 3,000 vehicles per day (2015 count), of which roughly 3% are trucks.

How long is County Line Road over Swamp Creek?

The structure is 51 ft (15.5 m) long with a longest span of 40 ft (12.2 m) and a deck 27 ft wide.

Who owns County Line Road over Swamp Creek?

It is owned by the Town or Township Highway Agency.