This mill site, utilizing an excellent source of power on the Black River, dates back to the 1760s. The present grist mill building, once the pride of Milltown, is approaching its 200 year anniversary. Built by Nathan Cooper, the latest ideas of automation were used for a more efficient operation. Embracing the ideas laid out in Oliver Evans' book, The Young Millwright and Miller's Guide, Cooper's Mill kept up with the latest technology that’s still seen throughout the mill today.
   Powered by a 16 foot, 6-1/2 ton water wheel, the restored four story mill is open for weekend tours through October. Operated by the New Jersey Morris County Park Commission and supported by Friends of Cooper Mill, mill visitors may be surprised to see the amount of century old mill machinery it takes to grind cornmeal and produce flour. Powered by the natural flow of the river, the 16 foot water-wheel generates about 45 horsepower at peak conditions. A series of belts transfers power to the 2000 pound millstones. Screw augers lift the flour to a sifting and bagging process, producing as much as 800 pounds in an hour.
   Visitors finding their way to Chester may also enjoy the county's hiking trails along the Black River. Bamboo Brook and Conifer Pass further extend the Black River Trail, while Patriots Path leads southward through Black River Wildlife Management Area to Elizabeth D. Kay Environmental Education Center and Willowwood Arboretum.

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