Colorado-Big Thompson Project Operations Water Year 2017

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Colorado-Big Thompson Project Operations Water Year 2017 Presented by Victor Lee P.E. Hydrologic Engineer Eastern Colorado Area Office Topics: • Colorado-Big Thompson Project Overview – Colorado River Collection System – Green Mountain Reservoir Three Lakes System - Keystone of Colorado River Collection System Colorado River Collection System • Supports Colorado River storage and diversion Colorado-Big Thompson Project • Includes Lake Granby, Shadow Mountain Reservoir, Grand Lake and Lake Granby in 2014 Willow Creek Reservoir • Also used for storage of Windy Gap and 10825 Fishery Water Reservoir Operations: Colorado-Big Thompson Collection System • Lake Granby is projected to physically fill (537 KAF) by July 15 – Colorado River releases directed by Interior Secretary order 75 cfs for May-August – Lake Granby is anticipated to have minimal or no spill – Higher than average runoff for Willow Creek Reservoir – No Windy Gap pumping – 10825 Colorado Endangered Fish Recovery releases in late summer-early fall – Grand Lake Clarity Adaptive Management implemented for 2016 continued in 2017 Physical Fill: Second Week of July 10825 Water used to augment releases in late summer and early fall Green Mountain Reservoir • Provides water storage for Upper Colorado River Basin beneficial use • Replacement water for Colorado River Collection System • Hydropower generation Green Mountain Reservoir Reservoir Operations: Green Mountain • Green Mountain Reservoir is projected to physically fill (154 KAF) around July 10 – No spill: maximum release around 1450 cfs – Release water for west-slope beneficial use – Expect to support the Colorado River Endangered Fish Recovery Program • Coordinated Reservoir Operations (CROS) • HUP Surplus Releases in September-October – Higher than Average Denver Water and Colorado Springs Utilities carry over storage contribute to higher than average inflow Coordinated Reservoir Operations HUP Irrigation Season Releases Fill Date Second Week of July Thank you Questions? Granby Spill in 2015.

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