This reserve is managed by the Jo Daviess Conservation Foundation. It offers hiking trails, bird watching, sightseeing, Native American archaeology and much more on 85 acres of scenic Mississippi River bluffs. Not only does Casper Bluff boast some of the most commanding views of the Mississippi River and its backwater sloughs, it is also an archaeologically significant site. The 85-acre site contains the Aiken Mound Group, named for the nearby community of Aiken. Knowledge of these mounds stems from 1900, when William Baker Nickerson, an amateur archaeologist who worked for the railroads, documented 51 mounds at this location: 38 long, wall-like structures, 12 conical mounds, and one Thunderbird effigy. Nickerson also observed an earth ellipse or hut-ring and two circular depressions. While the Effigy Mound peoples are thought to have abandoned the region after A.D. 1000, as late as 1875 members of the Ho-Chunk Nation performed ceremonies in the vicinity of Aiken Mounds and constructed a burial mound for the son of their leader, Green Blanket. This burial site is thought to be located one mile east of the reserve within the bottom lands of Small Pox Creek. Pet-Friendly.