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3 <br />PLATTE RIVER BASIN <br /> <br />06694920 SOUTH PLATTE RIVER ABOVE SPINNEY MOUNTAIN RESERVOIR, CO <br /> <br />LOCATION.--Lat 38°59'10", long 105°40'52" in NE1/4 Sec 21, T. 12S, R. 74W, Park County, 3.3 miles below the <br />confluence of the Middle and South Forks of the South Platte River, and 7 miles southeast of Hartsel, <br />CO. <br /> <br />DRAINAGE AREA AND PERIOD OF RECORD.--772 sq. mi.; 1983 to current year. <br /> <br />GAGE.--Data Collection Platform (DCP), shaft encoder and a continuous chart recorder in a at a 25-foot concrete <br />Parshall Flume with a wooden shelter and concrete well. Primary reference gage is an electric tape gage and <br />in-flume staff gage is supplemental. Gage and satellite monitoring equipment are owned and maintained by <br />the city of Aurora. <br /> <br />REMARKS.—Primary record is hourly averages of 15-minute satellite data. The record is complete and reliable, <br />except for November 21, 2007 to April 15, 2008, when the gage was shut down for winter; and, October 13, <br />14, 2007, June 5-13, 2008, and July 5-7, 2008, when intakes were fully or partially plugged. Average <br />daily satellite gage heights agreed with chart data to within ±0.01 ft. Encoder calibration was checked <br />with 39 visits while the gage was open. The record is good, except for periods of no gage height record <br />and when the intakes were fully or partially plugged, which are estimated and poor. Station operated and <br />record developed by Mike Wild. <br /> <br />RATING TABLE.--STD25FTPF USED FROM 01-Oct-2007 TO 30-Sep-2008 <br /> <br /> DISCHARGE, IN CFS, WATER YEAR OCTOBER 2007 TO SEPTEMBER 2008 <br /> MEAN VALUES <br /> <br /> DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br /> <br /> 1 44 37 20 35 25 10 30 79 336 452 145 85 <br /> 2 45 37 20 35 25 10 35 54 370 461 137 75 <br /> 3 45 34 20 35 25 10 40 53 417 449 135 68 <br /> 4 43 38 25 35 25 10 45 52 452 420 127 59 <br /> 5 41 35 25 35 25 10 50 53 435 400 127 55 <br /> 6 40 33 25 35 25 10 55 55 400 385 154 51 <br /> 7 38 33 30 35 25 10 65 59 350 370 159 47 <br /> 8 40 33 30 35 25 10 70 64 315 352 212 43 <br /> 9 38 31 30 35 25 10 70 68 310 324 212 40 <br /> 10 37 33 30 35 25 10 70 62 305 298 229 40 <br /> 11 37 33 30 35 20 10 70 62 300 288 234 40 <br /> 12 38 36 30 35 20 10 70 78 285 275 226 61 <br /> 13 45 37 30 35 20 10 85 91 280 270 188 79 <br /> 14 50 41 30 35 15 10 100 104 248 258 143 61 <br /> 15 57 30 30 35 15 10 106 134 251 257 146 53 <br /> 16 57 32 30 35 15 10 132 170 295 250 224 45 <br /> 17 54 30 30 35 15 10 111 177 335 276 288 40 <br /> 18 46 33 30 35 15 10 117 164 368 320 233 42 <br /> 19 40 32 30 35 15 10 121 169 404 293 218 46 <br /> 20 49 30 30 35 15 10 124 176 413 262 225 55 <br /> 21 46 25 30 35 15 10 119 188 408 239 214 59 <br /> 22 39 20 30 35 15 10 110 231 412 225 161 57 <br /> 23 47 20 30 35 15 10 115 222 418 208 152 52 <br /> 24 45 20 30 35 15 15 116 194 416 215 145 45 <br /> 25 44 20 35 35 15 15 107 181 437 199 123 41 <br /> 26 41 20 35 35 15 15 93 189 447 202 115 41 <br /> 27 40 20 35 35 15 20 83 193 464 194 104 40 <br /> 28 39 20 35 35 15 20 74 204 431 187 90 40 <br /> 29 38 20 35 35 10 20 77 226 427 192 79 40 <br /> 30 41 20 35 35 --- 20 77 269 439 175 95 39 <br /> 31 39 --- 35 25 --- 25 --- 307 --- 156 87 --- <br /> <br />TOTAL 1343 883 920 1075 545 380 2537 4328 11168 8852 5127 1539 <br />MEAN 43.3 29.4 29.7 34.7 18.8 12.3 84.6 140 372 286 165 51.3 <br />AC-FT 2660 1750 1820 2130 1080 754 5030 8580 22150 17560 10170 3050 <br />MAX 57 41 35 35 25 25 132 307 464 461 288 85 <br />MIN 37 20 20 25 10 10 30 52 248 156 79 39 <br /> <br />CAL YR 2007 TOTAL 34116 MEAN 93.5 MAX 457 MIN 10 AC-FT 67670 <br />WTR YR 2008 TOTAL 38697 MEAN 106 MAX 464 MIN 10 AC-FT 76760 <br /> <br />MAX DISCH: 478 CFS AT 16:00 ON Jun. 27, 2008 GH 2.69 FT. SHIFT 0.06 FT. <br />MAX GH: 2.69 FT. AT 16:00 ON Jun. 27, 2008 <br /> <br />FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY RECORD. <br /> <br />