
One of the few fishable hatches I encountered during the 2025 season was the unique bright yellow March Brown mayflies that I had first witnessed six years ago. Those unnaturally bright hued flies could be best described as safety yellow and, since it was the fiftieth anniversary of Woodstock just down the road in Bethel, NY, I took to calling it the Woodstock March Brown.
Since some of those psychedelic mayflies survived last year’s devastating drought and frigid, low flow winter, I have some hope that they might appear again when May rolls around. That hope made them a candidate for imitation, and it was only a matter of time before my new transitional dun design caught up with these Hendrix inspired bugs.
Though the pale, dirty yellow, faded wing critters that seem to have replaced our traditional big, beautiful caramel colored Catskill March Browns are also smaller than those formerly abundant flies, the Woodstocks must be eating better, as they remain a hearty size 10! I set to work yesterday crafting a trio of the new patterns.

Wood duck flank tails and the wrapped pheasant tail abdomen are common to this new series of transitional duns. I chose fine gold wire for the rib, brilliant yellow silk dubbing for the thorax and a CDC puff wing with dark brown between fore and aft brighter yellow feathers. Legs are added with a few fibers of brown back feathers from a Hungarian Partridge.
I have used multiple colors of CDC for decades to mimic heavily mottled wings for mayflies like the March Browns and Green Drakes, finding it very effective. I will be anxious to try this one if the Woodstock bugs grace us with an appearance in 2026 as the brilliant psychedelic yellow color has proven to be a trigger.

(Photo courtesy Matthew Supinski)
We saw a bit of additional snow on Saturday night, perhaps two inches here in the Eddy, with hope the higher elevations received more. Last week’s predicted inch was three inches deep here, while friends on one of the mountains sheltering the West Branch reported seven inches. Later this week we are being teased with the promise of a couple of days in the forties, so there is hope for some high altitude melting and some sorely needed water in the rivers.
A warmup would be most welcome, as this is already shaping up to be a very cold winter, here in mid-December. Reservoir releases are fairly low, Pepacton at 74.6 cfs and Cannonsville at 149 though the latter was in the 300 cfs range a few days ago. All our rivers have ice along their edges and bank to bank through their slower reaches. Most gaging stations are iced, though Lordville on the mainstem is clear and reading a very low 753 cfs and a water temperature of 31.6 degrees Fahrenheit. A good bump in flows would be beneficial. Dare we hope for sunshine?


























