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 August 5 at 10:35PM EDT until August 6 at 2:45AM EDT by NWS Mount Holly NJ

Effective: Wed August 5, 2026, 10:35 PM
Expires: Thu August 6, 2026, 2:45 AM

FFWPHI The National Weather Service in Mount Holly has issued a * Flash Flood Warning for... South Central Bucks County in southeastern Pennsylvania... Northeastern Delaware County in southeastern Pennsylvania... Southeastern Montgomery County in southeastern Pennsylvania... Northern Philadelphia County in southeastern Pennsylvania... * Until 245 AM EDT. * At 1035 PM EDT, Doppler radar indicated heavy rain across the warned area. Between 0.5 and 1 inch of rain has fallen. The expected rainfall rate is 1 to 2 inches in 1 hour. Additional rainfall amounts of 1 to 2 inches are possible in the warned area. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by heavy rain. SOURCE...Radar. IMPACT...Flooding of small creeks and streams, urban areas, highways, streets, and underpasses as well as other drainage and low lying areas. * Some locations that may experience flash flooding include... Philadelphia, Jenkintown, Narberth, Rockledge, Abington, Langhorne, Bryn Athyn, Willow Grove, Germantown, Chestnut Hill, Northeast Philadelphia and Roxborough. This includes the following highways... Interstate 476 in Pennsylvania between mile markers 9 and 11. Interstate 76 in Pennsylvania between mile markers 335 and 340. Pennsylvania Turnpike between mile markers 344 and 352.

Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding. Please report observed flooding to local emergency services or law enforcement and request they pass this information to the National Weather Service when you can do so safely.

Flash Flood Warning issued August 5 at 9:30PM EDT until August 6 at 1:15AM EDT by NWS Mount Holly NJ

Effective: Wed August 5, 2026, 9:30 PM
Expires: Thu August 6, 2026, 1:15 AM

At 930 PM EDT, the public reported thunderstorms producing heavy rain across portions of the warned area. Roadway flooding has been reported in the Phoenixville area. This heavy rain in a short period of time is also moving across central Montgomery County. Between 0.5 and 1 inch of rain has fallen in portions of the warned area. The expected rainfall rate is 1 to 2.5 inches in 1 hour. Flash flooding is already occurring. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Public reported. IMPACT...Flooding of small creeks and streams, urban areas, highways, streets, and underpasses as well as other drainage and low lying areas. Some locations that may experience flash flooding include... Philadelphia, Norristown, Phoenixville, Lansdale, West Norriton, East Norriton, Perkasie, Doylestown, Conshohocken, Hatboro, Souderton and Ambler. This includes the following highways... Interstate 476 in Pennsylvania between mile markers 12 and 19. Interstate 76 in Pennsylvania between mile markers 327 and 334. Northeast Extension between mile markers 21 and 36. Pennsylvania Turnpike between mile markers 317 and 344.

Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding.

Flash Flood Warning issued August 5 at 9:04PM EDT until August 6 at 1:15AM EDT by NWS Mount Holly NJ

Effective: Wed August 5, 2026, 9:04 PM
Expires: Thu August 6, 2026, 1:15 AM

FFWPHI The National Weather Service in Mount Holly has issued a * Flash Flood Warning for... Central Bucks County in southeastern Pennsylvania... Northeastern Chester County in southeastern Pennsylvania... North Central Delaware County in southeastern Pennsylvania... Central Montgomery County in southeastern Pennsylvania... * Until 115 AM EDT. * At 904 PM EDT, Doppler radar and automated rain gauges indicated thunderstorms producing heavy rain across the warned area. Between 0.5 and 1 inch of rain has fallen across parts of the warned area. The expected rainfall rate is 1 to 2.5 inches in 1 hour. Flash flooding is ongoing or expected to begin shortly. HAZARD...Flash flooding caused by thunderstorms. SOURCE...Radar and automated gauges. IMPACT...Flooding of small creeks and streams, urban areas, highways, streets, and underpasses as well as other drainage and low lying areas. * Some locations that may experience flash flooding include... Philadelphia, Norristown, Phoenixville, Lansdale, West Norriton, East Norriton, Perkasie, Doylestown, Conshohocken, Hatboro, Souderton and Ambler. This includes the following highways... Interstate 476 in Pennsylvania between mile markers 12 and 19. Interstate 76 in Pennsylvania between mile markers 327 and 334. Northeast Extension between mile markers 21 and 36. Pennsylvania Turnpike between mile markers 317 and 344.

Turn around...don't drown when encountering flooded roads. Most flood deaths occur in vehicles. Be especially cautious at night when it is harder to recognize the dangers of flooding.