US Bridges

South Franklin St. over Swan Creek

Fair

Hunterdon County, New Jersey · 150 South of RT518 · Structure no. 1000056

Built
1873
152 years old
Condition
Fair
inspected April 2023
Type
Arch - Deck
Masonry
Length
40 ft
1 main span
Daily traffic
469
2023 count
Owner
County
County Highway Agency

About this bridge

South Franklin St. over Swan Creek is a masonry arch - deck carrying South Franklin St. over Swan Creek in Hunterdon County, New Jersey. It was built in 1873, so it is 152 years old, older than the New Jersey average of 58.5 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 469 vehicles a day, roughly 1% of them trucks, projected to reach 572 by 2043. The structure is 40 ft (12.2 m) long and 43 ft wide.

Location

Open in Google Maps
CarriesSouth Franklin St.
CrossesSwan Creek
Location150 South of RT518
RouteCity Street 0
CountyHunterdon County
StateNew Jersey
Coordinates40.36473, -74.94136
Functional classUrban 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
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31 US tons
Inventory rating19 US tons

Structure

Structure typeArch - Deck
MaterialMasonry
DeckNot applicable
Main spans1
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span40 ft (12.2 m)
Deck width43 ft (13.1 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic469 (2023)
Projected traffic572 by 2043
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed—
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusEligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was South Franklin St. over Swan Creek built?

It was built in 1873, making it 152 years old in 2025.

What condition is South Franklin St. over Swan 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 April 2023.

How much traffic does South Franklin St. over Swan Creek carry?

About 469 vehicles per day (2023 count), of which roughly 1% are trucks.

How long is South Franklin St. over Swan Creek?

The structure is 40 ft (12.2 m) long with a longest span of 40 ft (12.2 m) and a deck 43 ft wide.

Who owns South Franklin St. over Swan Creek?

It is owned by the County Highway Agency.