Walkup is also a member of the Kent Chapter of the American Red Cross, Kent County Farm Bureau, the Chester River Association, the Eastern Shore Land Conservancy, and the Maryland Conservation Council.
Mississippi River | River Thames | Amazon River | Columbia River | Chester | Hudson River | Colorado River | Potomac River | river | Ohio River | Missouri River | Delaware River | Murray River | River Tyne | Madeira River | Volga River | River Nene | River Clyde | River Trent | River Severn | Amur River | River Wear | Allegheny River | Red River | Dnieper River | Yarra River | Paraná River | Chester A. Arthur | West Chester, Pennsylvania | River Tees |
He proposed a canal across the Delmarva Peninsula to connect the Chester River at modern-day Millington, Maryland, to the Delaware River.