An easy drive from Cambridge and Marietta, Senecaville is the largest of the MWCD lakes and the third largest inland lake in Ohio. <br> Senecaville Lake (or Seneca Lake) at glance: <br> 3,550 acres of water <br> 299 horsepower limit <br> One public boat launch ramp off of State Route 574 <br> 4,060 acres of land <br> Conservation (Normal) Pool Elevation: 832.2 ft. above sea level <br> Seneca Lake Park and Campground <br> 513 campsites in two locations (Class A full hookups and Class A with electric) <br> Swimming beach with concession stand <br> Vacation cabins, camper cabins, picnic shelters, log cabin nature center, special events, hiking trails, Amphitheater and playground. <br> Marina Seneca Marina is a full-service marina with boat sales and rentals, fuel, supplies and docking. Restaurant is open all year.