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HydroBase Data <br />Moffat Tunnel diversions are measured at the Moffat Water Tunnel at East Portal stream gage <br />(USGS ID 09022500, DWR ID MOFTUNCO). The data available in HydroBase for the 1950 to <br />present period pertaining to the Moffat Tunnel include the following: <br />Total River Diversions <br />• Complete record 1950 to present (see Figure 3) <br />• Historical diversions average about 52,000 ac-ft/yr over the 1950 to present period <br />• Annual deliveries typically follow a snowmelt runoff pattern, peaking in June <br />Figure 3 <br />Moffat Tunnel Monthly Diversions <br />40,000 <br />36,000 <br />32,000 <br />~ 28,000 <br />d' <br />.. <br />c 24,000 <br />.~ <br />a 20,000 <br />A <br />16,000 <br />~ 12,000 <br />8,000 <br />4,000 <br />0 <br />O M ~O O~ N v1 00 ~ h O M ~O O~ N v1 00 ~ <br />v1 v1 v1 v1 ~O ~O ~O h h h 00 00 00 00 O~ O~ O~ O O <br />ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti ti <br />2) Gross Reservoir (Structure ID 0604199) <br />Gross Reservoir stores transbasin water delivered <br />to South Boulder Creek through the Moffat <br />Tunnel and native flows from South Boulder <br />Creek. The reservoir was constructed in 1955 on <br />upper South Boulder Creek, about 5 miles west of <br />Eldorado Canyon. Gross Reservoir has a drainage <br />area of approximately 100 square miles. <br />Specifics regarding Gross Reservoir include: <br />• 41,811 ac-ft total capacity <br />• Maximum surface area of 414 acres <br />• 1 ac-ft dead pool <br />Denver Water Board Operating Memorandum 7 of 40 <br />Gross Reservoir <br />Photo source: http://www.water.denver.co.gov/ <br />