Delaware River Report: August 10, 2025

The release from Cannonsville is 699 cfs this morning from the overnight pulse to cool down the Mainstem. That should taper back to 500 cfs later this morning. We’ll be warmer and sunny today once the fog burns off. The Upper West has had tiny olives with some Sulphurs midday. The lower West has had olives and some Isonychias and Cahills towards evening. We’ve seen small olive spinners in the evening so have a few options in your box for those last light fish.

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 87 degrees and sunny. Wind will be light and variable.

Angelos with a nice rainbow yesterday. Tim Glynn photo
Neal putting one in the net with Guide Sean Witman.
Angelos also found a brown. Tim Glynn photo
It’s that time of year. August 15 – 16. Let’s clean up the river!

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, NY626 cfs46°
West Branch at Hale Eddy, NY754 cfs47°
East Branch at Harvard, NY165 cfs58°
East Branch at Fishs Eddy, NY303 cfsN/A °
Mainstem at Lordville, NY984 cfs67°
Beaverkill at Cooks Falls, NY116 cfs66°
West Branch at 191 Bridge57°
West Branch at Walton (Cannonsville inflow)79 cfs70°
Cannonsville Reservoir Release500 cfs
Cannonsville Reservoir Capacity83.1%
Pepacton Reservoir Capacity88.9%
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