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<br /> <br />1998 report to the Rio Grande Compact Commission <br /> <br />Bureau of Reclamation <br /> <br />SAN JUAN-CHAMA PROJECT, COLORADO-NEW MEXICO <br /> <br />San Juan-Chama Diversion Dams <br /> <br />Work included operating and maintaining Blanco, Oso, and Little Oso Diversion Dams; <br />cleaning sediment and debris from the diversion dams; and water accounting and <br />meClsurement. A total of 149,266 C1fwCls diverted through Azotea Tunnel during 1998 <br />(see Table 2). <br /> <br />Heron Dam and Reservoir Operation <br /> <br />Towards the end of 1998,snow p<lck in the San Juan Basin was below normal. Unless <br />. there is a Significant increase in the snow pack for 1999, if is unlikely Herein Reservoir. <br />will fill for the fourth straight year. In mid-Octoberof 1998, diversions were shut down <br />for routirie mEiinteriance activities in the tunnels. Diversions were resumed on March 8, <br />1999. Heron Reservoir began the yearat elevation 7,176.24 feet (ft) (345,510 af) and <br />reached a minimum elevation of 7,168.36 ft (304,353 af) on April 22. It reached a <br />maximum elevation of7, 181.82 ft (376,510 af) on July 1, as diversions continued and <br />San Juan-Chama Project (SJ-C) deliveries decreased. Heron Reservoir ended the . <br />year at an elevation of7, 176.17 ft (308,446 af). <br /> <br />.. Deliveries to allSJ-C contractors' .1998 allocations were delivered and completed by <br />December31, 1998. See Tables 3 and4 for Heron Reservoir operations. <br /> <br />l-IeronResource Management Plan <br /> <br />. The Heron Resource. Management Plan. (RMP) WaS completed in July 1998. The RMp. . <br />identified and addressed significant I<lnd resource issues within the Heron Reservoir <br />management boundaries and recommended management actions for future . <br />implementation. Recl<lmation selected <I preferred nl<ln<lgement str<ltegy for Heron <br />Reservoir th<lt follows <I "resol.lrce b<ll<lnce concept" whereby recre<ltion<ll development <br />dem<lrid is <lchieved while protecting, <lnd INhere possible, enh<lncing , other resources <br />within the project are<l. . . <br /> <br />Pojoaque Tributary Unit - Nambe Falls Dam and Reservoir <br />. . <br /> <br />N<lmbe Falls Reservoir beg<ln 1998 <It a storage of 1,552 af (6817. 79ft) and ended with <br />1,671 af (6,820.19 ft). Ouring the winter, releases aver<lged about 1.0 cubic feet per <br />Second W/s) to maximize conservation storage as agreed to by the pojoaque Valley <br />Irrig<ltion District (PVJD) and Jndi<ln water users. Winter stor<lge operationsc<lused the <br />reservoino fill and spill from M<lY 23 to June 26. Irrigation releases took place from <br />June 27 to July 7 which brought the reservoir down before the reservoir filled and <br />spilled again from July 29 to August 13. The maximum release of 47 ft3/s occurred <br />from May 29-31. Irrigation reieases were reinitiated. on July 26 and continued off and <br />on throughout the irrigation-season and ended on October 27. The maximum irrigation <br />season rele<lse, of 29 ft3/s was reached on September 9, The reservoir then continued <br />to decline for the rem<linder of the irrigation season reaching its lowest point of the year <br /> <br />-7- <br />