- Soil runoff from farms of Prince George's County, Maryland contributes to increased silting in the Potomac River.
- Civil War demands for timber for cooking and fuel deforest many stretches of the Potomac River Banks.
- The Army Corps of Engineers dredges the Potomac to keep it navigable.
- The U.S. Fish Commission hires seiners to catch shad and herring on the Potomac River.
- "Oystermen" harvest 15 million bushels of oysters in Maryland waters.
- Rock Creek Park is created to preserve some of the natural and historic resources within Washington, D.C.
- Shad and herring fish hatcheries are built at Fort Washington and Bryan's Road in southern Maryland.