US Bridges

Knowlton Road over Chester Creek / 3696-C10

Fair

Delaware County, Pennsylvania · Aston Industr.Pk. 33H13 · Structure no. 000000000015325

Built
1850
175 years old, rebuilt 2014
Condition
Fair
inspected March 2023
Type
Arch - Deck
Masonry
Length
82 ft
2 main spans
Daily traffic
5,295
2024 count
Owner
State
State Highway Agency

About this bridge

Knowlton Road over Chester Creek / 3696-C10 is a masonry arch - deck carrying Knowlton Road over Chester Creek / 3696-C10 in Delaware County, Pennsylvania. It was built in 1850 and reconstructed in 2014, so it is 175 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 5,295 vehicles a day, roughly 7% of them trucks, projected to reach 8,204 by 2032. The structure is 82 ft (25 m) long and 27 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesKnowlton Road
CrossesChester Creek / 3696-C10
LocationAston Industr.Pk. 33H13
RouteState Highway 0
CountyDelaware County
StatePennsylvania
Coordinates39.87717, -75.41919
Functional classUrban 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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating77.1 US tons
Inventory rating46 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckConcrete, cast-in-place
Main spans2
Design loadHS 15
Structure length82 ft (25 m)
Longest span37 ft (11.3 m)
Deck width27 ft (8.3 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,295 (2024)
Projected traffic8,204 by 2032
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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$1.1 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Knowlton Road over Chester Creek / 3696-C10 built?

It was built in 1850, making it 175 years old in 2025. It was reconstructed in 2014.

What condition is Knowlton Road over Chester Creek / 3696-C10 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 March 2023.

How much traffic does Knowlton Road over Chester Creek / 3696-C10 carry?

About 5,295 vehicles per day (2024 count), of which roughly 7% are trucks.

How long is Knowlton Road over Chester Creek / 3696-C10?

The structure is 82 ft (25 m) long with a longest span of 37 ft (11.3 m) and a deck 27 ft wide.

Who owns Knowlton Road over Chester Creek / 3696-C10?

It is owned by the State Highway Agency.