Station Name: Delaware River at Fort Mifflin at Philadelphia, PA
Data Source: Water Data - usgc.gov

Elevation Above Sea Level: 0 feet

Nearest Address:
Fort Mifflin Road
Philadelphia, PA 19153
Philadelphia County

GPS Coordinates: 39.8792798, -75.20268029

Nearby Water Temperatures

Flash Flood Warning issued July 21 at 6:05PM EDT until July 21 at 8:45PM EDT by NWS Mount Holly NJ

Effective: Tue July 21, 2026, 6:05 PM
Expires: Tue July 21, 2026, 8:45 PM

At 605 PM EDT, New Castle County Emergency Managers reported flooding in Newark and Wilmington. Vehicles were stranded and water rescues were ongoing. HAZARD...Life threatening flash flooding caused by thunderstorms. SOURCE...Radar. IMPACT...Life threatening flash flooding of creeks and streams, urban areas, highways, streets, and underpasses. Some locations that may experience flash flooding include... Wilmington, Newark, Pennsville, Carneys Point, Elsmere, New Castle, Penns Grove, Newport, Arden, Stanton, Wilmington Manor and Greenville. This includes Interstate 95 in Delaware between mile markers 1 and 23.

Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles.

Tornado Watch issued July 21 at 2:46PM EDT until July 21 at 9:00PM EDT by NWS Mount Holly NJ

Effective: Tue July 21, 2026, 2:46 PM
Expires: Tue July 21, 2026, 9:00 PM

TORNADO WATCH 507 REMAINS VALID UNTIL 9 PM EDT THIS EVENING FOR THE FOLLOWING AREAS THIS WATCH INCLUDES THE FOLLOWING ADJACENT COASTAL WATERS DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20 NM COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20 NM COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM

Tornado Watch issued July 21 at 2:07PM EDT until July 21 at 9:00PM EDT by NWS Mount Holly NJ

Effective: Tue July 21, 2026, 2:07 PM
Expires: Tue July 21, 2026, 9:00 PM

THE NATIONAL WEATHER SERVICE HAS ISSUED TORNADO WATCH 507 IN EFFECT UNTIL 9 PM EDT THIS EVENING FOR THE FOLLOWING AREAS THIS WATCH INCLUDES THE FOLLOWING ADJACENT COASTAL WATERS DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE COASTAL WATERS FROM SANDY HOOK TO MANASQUAN INLET NJ OUT 20 NM COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20 NM COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20 NM COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM

Tornado Watch issued July 21 at 6:36PM EDT until July 21 at 9:00PM EDT by NWS Mount Holly NJ

Effective: Tue July 21, 2026, 6:36 PM
Expires: Tue July 21, 2026, 9:00 PM

TORNADO WATCH 507 REMAINS VALID UNTIL 9 PM EDT THIS EVENING FOR THE FOLLOWING AREAS THIS WATCH INCLUDES THE FOLLOWING ADJACENT COASTAL WATERS DELAWARE BAY WATERS NORTH OF EAST POINT NJ TO SLAUGHTER BEACH DE DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE COASTAL WATERS FROM MANASQUAN INLET TO LITTLE EGG INLET NJ OUT 20 NM COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20 NM COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM

Small Craft Advisory issued July 21 at 4:46PM EDT until July 22 at 6:00AM EDT by NWS Mount Holly NJ

Effective: Tue July 21, 2026, 4:46 PM
Expires: Wed July 22, 2026, 6:00 AM

* WHAT...Southwest winds 15 to 20 kt with gusts up to 30 kt and choppy waters. * WHERE...Delaware Bay waters north of East Point NJ to Slaughter Beach DE and Delaware Bay waters south of East Point NJ to Slaughter Beach DE. * WHEN...Until 6 AM EDT Wednesday. * IMPACTS...Conditions will be hazardous to small craft.

Inexperienced mariners, especially those operating smaller vessels, should avoid navigating in hazardous conditions.