the Indian Bluffs Primitive Area State Preserve (845 acres, privately owned, managed by the Iowa DNR). The canyon walls in Pictured Rocks make it one of the most popular rock climbing areas in Eastern Iowa, with numerous routs and pre-set anchors for climbing ropes; the highest rock face is 75 feet (23m). Maquoketa Caves State Park, a few miles upstream from Maquoketa protects a segment of the Driftless Area's karst topography, characterized by caves, ice caves and sinkholes. See also List of rivers of Iowa References External links Univ. of Iowa: Bass on the Maquoketa Smallmouth bass Retrieved July 18, 2007 Backbone State Park website Rivers of Iowa Tributaries of the Mississippi River Driftless Area Rivers of Fayette County, Iowa Rivers of Clayton County, Iowa Rivers of Delaware County, Iowa Rivers of Jones County, Iowa Rivers of Jackson County, Iowa