General Info

An easy drive from Cambridge and Marietta, Seneca is the largest of the MWCD lakes and the third largest inland lake in Ohio.

Seneca Lake Park and Campgrounds

  • 513 campsites in two locations (Class A full hookups and Class A with electric)
  • Swimming beach with concession stand
  • Vacation cabins
  • Picnic shelters
  • Log cabin nature center, special events
  • Hiking trails
  • Free Wi-Fi internet access at the swimming beach
  • Playground
  • Park Campground Rules
  • Golf Cart Policy

Free Wi-Fi internet access is available at the Seneca Lake Park swimming beach and at the Marina Point picnic shelter.

Seneca Lake at glance:

  • 3,550 acres of water surface
  • 399 horsepower limit
  • 3 public boat launch ramps
  • 4,060 acres of land
  • Conservation (Normal) Pool Elevation: 832.2 ft. above sea level
  • Check current lake levels


Seneca Marina is operated by the MWCD. Click here to view the website


Employment Opportunties
Park Plans & Developments

We issue alerts regarding imminent threats to health and safety, and updates that affect activities or property in and around the lake.