The original mill on the historic site in Washington Crossing State Park (New Hope, Pa) was built in 1740. The Thompson-Neely Grist Mill was rebuilt in 1829, again in 1879 and then restored in the 1970s. The present mill was brought back to working order around 2016. With a restored mill race and water wheel, Keystone Rosen rye was ground into grist on October 4, 2020.
The Delaware Valley Fields Foundation partnered with the team at the Thompson-Neely Grist Mill in Washington Crossing Historic Park in promoting its reemergence as an active producer within Pennsylvania's grain supply chain.
Glenn Blakely, miller and man behind the most recent restorations at the historic mill, has begun to work with Double Eagle Malt House and Dancing Star Farms to produce flour and cornmeal that will be made available for sale to the public.
On October 4, 2020, 1100 lbs of Keystone Rosen rye and approximately 500 pounds of Dylan rye were ground into rye meal between Thompson Neely Grist Mill's massive millstones under the supervision of Glenn Blakely. Both rye varietals were utilized by Stoll & Wolfe Distillery to create rye whiskey.