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SPDSS Task 4 Memorandum <br />November 23, 2004 <br />Station 09047300 data was unavailable for 1969 and 1970. Vidler Tunnel <br />diversion data in these years was filled with data from the Wheeler report, the <br />only source of data available for 1969 and 1970. <br />As a result of the variety of diversion data sources available, a StateMod format <br />data file (VIDTLJNCOfilled. stm) was created for Vidler Tunnel. <br />Continuously monitored Station 09047300 is the preferred source for historical <br />and future diversion data for Vidler Tunnel. <br />August P. Gumlick Tunnel <br />Prior to 1959, August P. Gumlick Tunnel (aka, Williams Fork Tunnel, Williams Fork <br />Diversion Project, and Jones Pass Tunnel) transported water from the Colorado River <br />basin to the Clear Creek basin and was considered transmountain water into the South <br />Platte basin. In 1959, operation of Vasquez Tunnel began by Denver Water. Water <br />being transported through Gumlick Tunnel was diverted through a new flume, directing <br />the total amount of Gumlick Tunnel water through Vasquez Tunnel. Vasquez Tunnel <br />transports Gumlick Tunnel water west through the Continental Divide, thereby <br />transporting Gumlick Water Tunnel to the Moffat Water Tunnel. Water originally <br />transported through Gumlick Tunnel now makes its way into the South Platte Basin <br />through the Moffat Water Tunnel. An operating memorandum was not developed <br />specifically for Gumlick Tunnel. <br />The continuously monitored streamgage Station APGTLTNCO records all diversions <br />through Gumlick Tunnel, regardless of whether the water is being re-diverted back <br />through Vasquez Tunnel. While diversion records are available for Station APGTLTNCO <br />from prior to 1950 through 1999, only that portion of the records prior to and including <br />1958 are considered accretions to the South Platte River basin. <br />Since 1959, water transported through Gumlick Tunnel has been infrequently discharged <br />down Clear Creek. The original flume for Gumlick Tunnel still exists below the by-pass <br />gate and flume for Vasquez Tunnel. Discharge of Gumlick Tunnel water into the Clear <br />Creek basin is known to have occurred twice, in 1993 and 1995. Evidence of these two <br />spill events into the Clear Creek basin are recorded as administrative data for Station <br />0704650 with a RelClass measurement type in HydroBase. <br />In an email correspondence with Bob Cooper, hydrographic supervisor for the State, it <br />was learned that Gumlick Tunnel has been discontinued from the published record for <br />Division 1 in 2000 to call attention to the fact that Gumlick Tunnel is not a separate <br />transmountain diversion. However, Denver Water, owner of Gumlick Tunnel, reserves <br />the right to deliver water down Clear Creek. Should Denver Water choose to deliver <br />water down Clear Creek, it is the intent of Mr. Cooper to publish a record called "A.P. <br />Gumlick Tunnel Delivery to Clear Creek." <br />• To accurately reflect the contribution by Gumlick Tunnel to the South Platte <br />basin, a StateMod format data file (APGTLJNCOfilled.stm) was created for <br />Gumlick Tunnel. <br />Page 14 of 19 <br />