In the 1850s, the Eureka Powder Works manufactured sporting and blasting powder along Merrymeeting Road in New Durham. It operated for only a few years before shutting down. In 1946, the state opened the Powder Mill Fish Hatchery on the same property. Today it is the largest fish production facility in New Hampshire, raising landlocked Atlantic salmon and trout. It is open to the public year round and free to visit.
Same water. Same land. Completely different outcome.