South Platte River, Elevenmile Canyon Reservoir to Chatfield : National Geographic Maps Division : 9781566957021 : 1566957028 : 05 Oct 2017 : Waterproof, Tear-Resistant Fishing & River Map. The South Platte River, Elevenmile Canyon Reservoir to Chatfield Reservoir Fishing & River Map Guide is designed to be the perfect companion to anyone recreating on the South Platte from just below Elevenmile Canyon Reservoir to the southwestern suburbs of Denver. The South Platte below Elevenmile is dramatically different than flat meandering flow found upstream. Almost immediately it enters a series of steep canyons and recreation areas managed by the Pike National Forest before existing the Front Range at Waterton Canyon. Each Fishing & River Map Guide includes detailed river maps at a scale of 1 inch to 1/2 mile. At this scale every turn in the river and rapid is clearly shown and labeled. Each page is centered on the river and overlaps with the adjacent pages so finding any location along the r