Legend has it that a Loch Ness-style creature inhabits this unusually tranquil Sandhills lake, with its tempting camping, fishing, hiking and picnic facilities. Park permit required. Walgren Lake State Recreation Area is an 80-acre area with a 50-acre lake that offers visitors primitive camping, boating, fishing, and picnicking in a tranquil prairie setting. Its campground is a gem in Nebraska, rewarding visitors with views of gorgeous sunsets over the lake as they settle in for the night. Mature, shady cottonwood trees are scattered throughout Walgren Lake State Recreation Area's 40 campsites.