US Bridges

Watson Mill Road over Broad Run

FairPosted for load

Chester County, Pennsylvania · London Britain 3910-J8 · Structure no. 000000000010646

Built
1915
110 years old
Condition
Fair
inspected July 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
33 ft
1 main span
Daily traffic
959
2018 count
Owner
County
County Highway Agency

About this bridge

Watson Mill Road over Broad Run is a steel stringer/multi-beam or girder carrying Watson Mill Road over Broad Run in Chester County, Pennsylvania. It was built in 1915, so it is 110 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. Its operating status is: posted for load restriction.

It carries about 959 vehicles a day, roughly 11% of them trucks, projected to reach 1,055 by 2023. The structure is 33 ft (10.1 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesWatson Mill Road
CrossesBroad Run
LocationLondon Britain 3910-J8
RouteCity Street 0
Coordinates39.76736, -75.7587
Functional classRural Local

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 protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourScour critical; foundations unstable for calculated scour conditions
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment4: Meets minimum tolerable limits to be left in place as is
Operating rating63.1 US tons
Inventory rating28 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length33 ft (10.1 m)
Longest span30 ft (9.1 m)
Deck width21 ft (6.5 m)
Roadway width18 ft (5.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic959 (2018)
Projected traffic1,055 by 2023
Trucks11%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$309,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Watson Mill Road over Broad Run built?

It was built in 1915, making it 110 years old in 2025.

What condition is Watson Mill Road over Broad 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 July 2023.

How much traffic does Watson Mill Road over Broad Run carry?

About 959 vehicles per day (2018 count), of which roughly 11% are trucks.

How long is Watson Mill Road over Broad Run?

The structure is 33 ft (10.1 m) long with a longest span of 30 ft (9.1 m) and a deck 21 ft wide.

Who owns Watson Mill Road over Broad Run?

It is owned by the County Highway Agency.