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SPDSS Task 4 Memorandum <br />November 23, 2004 <br />determining diversions would result in incorrect diversion measurements for all <br />years for which the 2-foot rating curves were used. <br />• Continuously monitored Station 09046000 represents a complete set of diversion <br />data for the SPDSS study period and is the preferred source for historical and <br />future diversion data for Boreas Pass Ditch. <br />Fnreka Hitch <br />Eureka Ditch was a small diversion structure which diverted water from the headwaters <br />of Tonahutu Creek, a tributary of the north Fork of the Colorado River, and delivered it <br />into the headwaters of Spruce Creek, a tributary of the Big Thompson River. Eureka <br />Ditch was sold by the City of Loveland to the National Park Service in 1995 for use in <br />Rocky Mountain National Park. The purpose of the acquisition of Eureka Ditch by <br />Rocky Mountain National Park was to enable the National Park Service to eliminate the <br />ditch and restore natural conditions and flows to the watershed. Since 1995, there have <br />been no recorded diversions through Eureka Ditch. An operating memorandum specific <br />to Eureka Ditch was not prepared. <br />• Continuously monitored Station 09012000 represents a complete set of diversion <br />data for the SPDSS study period and is the preferred source of historical diversion <br />data for Eureka Ditch. <br />Grand River Ditch <br />• Continuously monitored Station 09010000 represents a complete set of diversion <br />data for the SPDSS study period and is the preferred source for historical and <br />future diversion data for Grand River Ditch. <br />Moffat Water Tunnel <br />• A comparison of the continuously monitored streamflow data at Station 09022500 <br />and data supplied by Denver Water indicated differences in diversion data for <br />Moffat Tunnel. Continuously monitored data recorder, Station 09022500, records <br />Moffat Tunnel diversions at the East Portal. Denver Water's approach to <br />measuring diversions through the Moffat Tunnel is to take the sum of diversion <br />records at three historic gages: l) Vasquez #1 gage, which measures flows from <br />Cooper Creek, Little Vasquez Creek, Vasquez Creek, and the St. Louis Creek <br />tributaries, 2) Ranch Ditch gage, which measures flows from the total of the <br />Denver Ranch Creek tributaries and the Englewood Ranch Creek system, and 3) <br />Fraser -Jim Ditch gage, which measures flows from the Fraser River and Jim <br />Creek. Denver Water considers the sum of these three gages to be more accurate <br />than the gage at the East Portal of Moffat Tunnel. <br />• Continuously monitored Station 09022500 represents a complete set of diversion <br />data for the SPDSS study period and is the preferred source for historical and <br />future diversion data for Moffat Tunnel. <br />Page 11 of 19 <br />