Delaware River Report: August 20, 2025

The release from Cannonsville is 603 cfs. It’s much cooler today and we have almost an inch of rain in the forecast. The early rain is predicted to be heavy. We’ll post an update if it affects the river significantly. Look for olives hatching later in the day with the lighter rain.

The Beaverkill, Lower East Branch, and Mainstem water temps are still peaking in the mid to high 70’s. It’s time to give these rivers a break until they cool back down.

Today will be 61 degrees and rainy. Wind will be 5 – 10 mph from the Southeast.

What’s Hatching:
Slate Drake – #12-2xl – 12 – Isonychia bicolor
Light Cahill – #14 – Epeorus vitreus (male), Ephemeralla rotunda, Ephemerella invaria
Pale Evening Dun – #14 – Epeorus vitreus (female)
Sulphur – #16 – 20 – Ephemerella dorothea
Dark Blue Wing Olive – #16 – 18 – Baetis spp.
Tan Caddis – #16 – 18 – Hydropsyche spp.
Tiny Blue Wing Olive – #22 – 26 – Pseudocloeon sp.


Click on the gauge links below for the latest flow information.

View the current local weather conditions.

Click on any gauge for the most recent data:
West Branch at Stilesville, NY558 cfs47°
West Branch at Hale Eddy, NY653 cfs49°
East Branch at Harvard, NY163 cfs55°
East Branch at Fishs Eddy, NY255 cfsN/A
East Branch at Hancock, NY68°
Mainstem at Lordville, NY1040 cfs62°
Beaverkill at Cooks Falls, NY83 cfs65°
West Branch at 191 Bridge55°
West Branch at Walton (Cannonsville inflow)60 cfs67°
Cannonsville Reservoir Release603 cfs
Cannonsville Reservoir Capacity77.3%
Pepacton Reservoir Capacity86.1%
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