Perkiomen Creek at Graterford, PA
River level and flood forecast · Montgomery County
The river is 8.2 ft below flood stage (11 ft).
Forecast to fall to 1.3 ft by Thu, Oct 15, 2 PM.
Flow: 1,000 cubic feet per second (USGS).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 3:02 PM. Forecasts change as rain falls and as upstream water arrives.
Flood stages
| Major flood stage | 16 ft |
| Moderate flood stage | 13 ft |
| Flood stage | 11 ft |
| Action stage | 8 ft |
| Record crest (September 2, 2021) | 24.23 ft |
What floods at each level
From the National Weather Service, highest first.
- 19 ftThe Schwenksville Sewer and Water Plant floods as does Route 73/Haldeman Road.
- 18 ftSmaller tributaries are affected by high water from the Perkiomen. Flooding is possible near the Route 113 Bridge in Perkiomen Township.
- 16 ftCollegeville businesses on Route 29, between East Ninth Avenue and East Main Street, begin to take on water.
- 15 ftEast Main Street in Collegeville floods.
- 14 ftStorm sewers back up in Collegeville and flood Route 29.
- 13 ftFirst Avenue in Collegeville becomes impassable.
- 12 ftPortions of Central Perkiomen Park in Collegeville are flooded. Flood waters expand onto and to the west of First Avenue in Collegeville.
- 11 ftGraterford Road and Penitentiary Bridge are closed due to flooding.
- 8 ftPark Avenue in Schwenksville is flooded. The Perkiomen Trail is flooded in Perkiomen Township at Plank Road and Route 113.
Highest crests on record
- 24.23 ft — September 2, 2021
- 19.32 ft — August 5, 2020
- 18.26 ft — July 9, 1935
- 18.2 ft — August 28, 2011
- 17.08 ft — June 22, 1972
Recent crests: 13.57 ft (January 10, 2024) · 13.87 ft (December 28, 2023) · 13.97 ft (December 18, 2023) · 24.23 ft (September 2, 2021) · 12.93 ft (December 25, 2020)
Up and down the river, and nearby
- UpstreamPerkiomen Creek at East Greenville, PA
- East Branch Perkiomen Creek at Schwenksville, PA
- Schuylkill River at Norristown, PA
- Valley Creek at PA Turnpike Bridge near Valley Forge, PA
- Schuylkill River at Pottstown, PA
- West Branch Perkiomen Creek at Hillegass, PA
- East Branch Brandywine Creek below Downingtown, PA
- Little Lehigh Creek near Trexlertown, PA
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (GRAP1); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.