Summit County State of the River 2018 Operations Update Kalsoum Abbasi, P.E. Colorado Springs Utilities May 2, 2018

Yield Forecast April 1 Hoosier Pass: 89% Current: 103%

Yield Forecast April 1 streamflow forecasts (50% exceedance probability): Dillon Reservoir Inflow 84% (May 1 ESP ~ 85%) Green Mountain Reservoir Inflow 82% (May 1 ESP ~ 81%) Colorado River near Dotsero 80% (May 1 ESP ~ 72%) Forecast based on Hoosier Pass SNOTEL and NRCS streamflow forecasts – April: 11,000 acre-feet HOWEVER, doubtful that the river call will allow full diversion

Average Diversions & Supply April 1 yield forecast: 11,000 acre-feet Average Blue River yield: 13,300 acre-feet Average Blue River diversion: 7,700 acre-feet Affected by: Terminal storage South Platte River call

2018 Operations Expect May yield forecast to be similar to April Probably skewed too high based on conditions in the rest of the basin May divert approximately 6 – 8 KAF Terminal storage is average for this time of year May be called out by senior rights early Anything not diverted is bypassed to Blue River

Blue River Operations Questions?