Petenwell Lake is a 23173 acre lake located in Juneau, Wood, and Adams Counties. It has a maximum depth of 44 feet. Visitors have access to the lake from public boat landings, public beaches. The lake is used for boating, skiing/tubing, sailing, canoeing/kayaking and fishing Fish include Musky, Pan fish, Largemouth Bass, Smallmouth Bass, Northern Pike, Walleye, Sturgeon and Catfish. Bald eagles can be seen daily over the lake.

The Wisconsin River is dammed in Nekoosa to form Lake Petenwell and dammed between Lake Petenwell Lake and Castle Rock Lake to become Wisconsin’s 2nd largest lake in 1948. Armenia Township runs along the west side of lake from the northern top of the township to southern end the township.

Petenwell Rock is at the dam between Petenwell and Castle Rock lakes. The legend of Petenwell Rock holds that an Indian man and Indian princess named Clinging Vine fell in love. Clinging Vine's father frowned on the match, so the two lovers ran off. Pursued by the Chief and a band of warriors, Clinging Vine and her lover climbed the tall rock on the banks of the Wisconsin River. Rather than be captured and separated, the lovers leaped from the rock, into the water, never to be seen again. In fact, the Rock is named after Peter Wells, an early settler who owned it.