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<br />ARKANSAS BASIN <br /> <br />Basinwide Conditions Assessment <br />The SWSI value for the month was 1.4. Flow at the <br />gaging station Arkansas River near Portland was 984 cfs, as <br />compared to the long-term average of 940 cfs. Storage in <br />Turquoise, Twin Lakes, Pueblo, and John Martin reservoirs <br />totaled 1060/0 of normal as of the end of August. <br /> <br />Outlook <br />The Arkansas River call began the month set at the <br />Fort Lyon Canal #2 call (3/1/1887). Heavy rains occurred <br />over the St. Charles River Basin in early August causing <br />significant local flood damage near Beulah and causing an <br />estimated peak flow on August 2, 2007 through the St. <br />Charles River at Vineland gage of 1 ,400 cfs. Additionally the <br />heavy rainfall contributed to a large increase in storage in <br />Pueblo Reservoir which was quickly passed downstream. <br />The resulting peak flow through the Arkansas River near <br />Avondale gage was 2,350 cfs and, as a result the river call <br />was much more junior from August 3rd through August 9th. <br />The river call at the end of August was set at the Amity #1 <br />call (2/21/1887) reflecting the gradual decrease in significant <br />rain events that occurred. <br /> <br />Administrative/Manaaement Concerns <br />Pueblo Board of Water Works drained Clear Creek <br />Reservoir down during August to begin construction repair <br />work on the dam and outlet works in September. PBWW <br />had a challenge finding sufficient short-term storage to <br />accommodate the released water and had some water sales <br />during 2007 to mitigate the temporary interruption in storage <br />and voluntarily decreased west-slope imports for a period of <br />time as well. <br /> <br />Sep-07 <br /> <br />ARKANSAS BASIN SV\BI HISTORY <br /> <br />4.0 <br /> <br /> <br />3.0 <br /> <br />2.0 <br /> <br />I- <br />W <br />S <br /> <br />1.0 <br /> <br />w <br />:3 <br /><( <br />> 0.0 <br />>< <br />w <br />o <br />z <br />- -1.0 <br />>- <br />a:: <br />o <br />-2.0 <br /> <br />-3.0 <br /> <br />-4.0 <br />Jan-97 Jan-98 Jan-99 Jan-OQ Jan-01 Jan-02 Jan-03 Jan-04 Jan-05 Jan-06 <br /> <br />I\i1ONTH / YEAR <br /> <br />ARKANSAS RIVER NR. PORTLAND, FLOW BY WATER YEAR <br /> <br />1,200,000 <br /> <br /> <br />m 1,000,000 <br />LL <br />Q, <br />U <br /><( 800,000 <br />s- <br />o <br />---l <br />LL <br />W 600,000 <br />> <br />i= <br /><( <br />---l <br />~ 400,000 <br />:J <br />U <br /> <br />200,000 <br /> <br />Nov Dee Jan Feb March April May June July Aug Sept <br /> <br />--e- WET (1984) ---+-- DRY (2002) -fr- AVG --* 2007 <br /> <br />REPRESENTATIVE RESERVOIRS <br /> <br />160,000 <br /> <br /> <br />140,000 <br /> <br />120,000 <br /> <br />Q) <br />Q) <br />~ 100,000 <br />u <br />ro <br />Q)- <br />g' 80,000 <br />o <br />OJ <br />~ 60,000 <br />m <br />:J <br /> <br />40,000 <br /> <br />20,000 <br /> <br />John Martin <br /> <br />Pueblo <br /> <br />Turquoise <br /> <br />Twin Lakes <br /> <br />II Avg. 08/31 Contents <br /> <br />II 08/31/07 Contents <br /> <br />4 <br />