US Bridges

Saw Mill Road over Darby Creek

Fair

Delaware County, Pennsylvania · 1.1MI.WEST PA-320 13-A1 · Structure no. 000000000015399

Built
1922
103 years old
Condition
Fair
inspected December 2023
Type
Arch - Deck
Concrete
Length
54 ft
1 main span
Daily traffic
4,029
2022 count
Owner
County
County Highway Agency

About this bridge

Saw Mill Road over Darby Creek is a concrete arch - deck carrying Saw Mill Road over Darby Creek in Delaware County, Pennsylvania. It was built in 1922, so it is 103 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 4,029 vehicles a day, roughly 3% of them trucks, projected to reach 4,487 by 2042. The structure is 54 ft (16.5 m) long and 21 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesSaw Mill Road
CrossesDarby Creek
Location1.1MI.WEST PA-320 13-A1
RouteCounty Highway 0
CountyDelaware County
StatePennsylvania
Coordinates40.01256, -75.38723
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
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating80 US tons

Structure

Structure typeArch - Deck
MaterialConcrete
DeckNot applicable
Main spans1
Design loadH 20
Structure length54 ft (16.5 m)
Longest span54 ft (16.5 m)
Deck width21 ft (6.4 m)
Roadway width18 ft (5.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,029 (2022)
Projected traffic4,487 by 2042
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

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$79,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Saw Mill Road over Darby Creek built?

It was built in 1922, making it 103 years old in 2025.

What condition is Saw Mill Road over Darby Creek 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 December 2023.

How much traffic does Saw Mill Road over Darby Creek carry?

About 4,029 vehicles per day (2022 count), of which roughly 3% are trucks.

How long is Saw Mill Road over Darby Creek?

The structure is 54 ft (16.5 m) long with a longest span of 54 ft (16.5 m) and a deck 21 ft wide.

Who owns Saw Mill Road over Darby Creek?

It is owned by the County Highway Agency.