Volcanic tuff and sediment give Spring Valley State Park a beautiful light-gray, pink and white backdrop. A popular area for boating, swimming and camping, the park also allows visitors the opportunity to tour historic ranches built in the late 1800s. The 59-acre Eagle Valley Reservoir offers fisherman an opportunity to catch rainbow, tiger and German brown trout, and attracts an array of waterfowl and shore birds, including mallards, herons, avocets and the infrequent, yet beautiful, trumpeter swan. Campers and hikers share the canyons and valleys with soaring eagles, hawks and songbirds.