What is a watershed?

It is an area of land that catches rain and/or snow and drains into a wetland, stream, or groundwater.

Watersheds of Mercer County

Mercer County is part of the Ohio River Basin. Each basin is divided into sub-basins, and these are divided into watersheds. Mercer County consists of 100 small watersheds that make up the Ohio River and Allegheny sub-basins. They range in size from 1.75 acres to over 31,000 acres. The Ohio River and Allegheny sub-basins drain 364,596 acres and 71,867 acres respectively in Mercer County. Within the Ohio River sub-basin is most notably the Shenango River Watershed. It receives water from streams such as the Little Shenango River, Pymatuning Creek, Otter Creek, Coolsping Creek, and Neshannock Creek and drains 310,483 acres of the county.

Explore Our Major Watersheds......Just Click


Pennsylvania's streams face many challenges including decreased flow, pollution from historic industrial or mining activities, increased nutrients and sedimentation, and invasive species. These challenges also threaten the social, physical, and economic well being of Pennsylvania. Local watershed groups can, and do, affect positive changes in our streams and communities. Please take some time to visit the groups actively involved in the management of our waters or if you are interested in forming a watershed group please contact us at This email address is being protected from spambots. You need JavaScript enabled to view it..


Neshannock Chapter of Trout Unlimited

Shenango River Watchers

Cool Springs Watershed Association
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.

French Creek Valley Conservancy

Sandy Lake History from Milt

Mercer County
Conservation District

24 Avalon Court, Suite 300
Mercer, PA 16137
Phone: 1-724-662-2242
Fax: 724-662-3905

Member, Pennsylvania Association
of Conservation Districts, Inc