Lake Nickajack 24″x36″ One-sided. Scale 1:45,000 Waterproof and Tear Resistant! GPS Compatible, Mairina Listings, Lake Structure, Road Network and More. Nestled in the Valley of the Tennessee River offering 215 miles of shoreline, 10,370 acres of surface area and is 46 miles long, extending up to Chickamauga Dam. The watershed (which is the area of land providing drainage to the reservoir) for Nickajack Lake is 21,900 square miles. Surrounding counties of Nickajack Lake include Marion County and Hamilton County. Activities available on Nickajack Lake include: boating, fishing, waterskiing, jetskiing, swimming, camping, public parks, public access areas, picnic areas and more. On both sides of the river below Nickajack dam are fishing berms and a concrete fishing pier with foot bridges and wheelchair ramps.