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<br /> <br /> 21 <br /> <br /> PLATTE RIVER BASIN <br /> <br />06724000 ST. VRAIN CREEK AT LYONS, CO <br /> <br />LOCATION.--Lat 40°13'05", long 105°15'34", in NW¼NW¼ sec. 20, T.3 N,, R.70 W., Boulder County, Hydrologic <br />Unit 10190005, on left bank 75 ft southwest of U.S. Highway 36 (State Highways 7 and 66) at <br />southeast edge of Lyons, 400 ft upstream from St. Vrain Supply Canal, and 0.4 mi downstream from <br />confluence of North and South St. Vrain Creeks. <br /> <br />DRAINAGE AREA AND PERIOD OF RECORD.--212 mi². Aug. 1887 to Sep. 1891, June 1895 to current year. Monthly <br />only data for some periods. Water quality data available from Oct. 1977 to Feb. 1981. <br /> <br />GAGE.--Water-stage recorder with satellite telemetry in timber shelter. The DCP is the primary record with <br />chart recorder as backup. Supplemental outside staff gage. <br /> <br />REMARKS.--Primary record is hourly data taken from satellite monitoring with chart back up. The record is <br />complete and reliable. The record is good. Station maintained and record developed by Merlin <br />Friedrichsen. <br /> <br />RATING TABLE.--SVCLYOCO22 USED FROM 01-OCT-2000 TO 09-OCT-2000 <br /> <br /> DISCHARGE, IN CFS, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 <br /> MEAN VALUES <br /> <br /> DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br /> <br /> 1 39 23 18 20 19 15 16 125 311 214 69 47 <br /> 2 33 20 18 19 17 13 18 173 343 202 69 42 <br /> 3 35 24 21 18 17 14 18 159 358 186 70 36 <br /> 4 36 24 19 18 17 13 21 145 319 189 69 33 <br /> 5 41 29 21 16 18 16 22 191 275 187 68 31 <br /> 6 42 19 20 17 16 15 22 166 254 184 70 36 <br /> 7 41 16 18 17 15 13 20 184 279 193 86 36 <br /> 8 37 18 16 19 17 13 19 183 325 217 91 49 <br /> 9 37 21 16 21 16 13 17 163 376 204 112 54 <br /> 10 34 21 16 17 15 13 20 145 334 180 110 53 <br /> 11 26 21 13 16 16 13 27 159 359 164 106 49 <br /> 12 24 16 17 18 17 13 26 177 365 154 96 43 <br /> 13 26 15 19 18 16 14 20 206 319 192 86 41 <br /> 14 26 18 18 16 15 13 19 252 265 190 84 49 <br /> 15 25 20 17 12 16 12 21 324 191 171 97 55 <br /> 16 27 21 16 18 15 13 21 303 162 148 111 57 <br /> 17 27 18 20 19 15 14 18 341 171 126 105 55 <br /> 18 26 18 19 18 16 14 19 354 188 106 89 59 <br /> 19 27 18 17 16 16 13 20 307 192 93 76 55 <br /> 20 26 18 16 16 15 13 23 271 214 89 71 49 <br /> 21 27 20 15 17 16 15 31 246 240 89 72 44 <br /> 22 30 20 20 18 15 14 43 175 243 102 66 38 <br /> 23 31 19 20 17 15 15 36 157 237 98 64 34 <br /> 24 30 21 21 17 17 17 39 145 234 98 59 33 <br /> 25 28 21 22 16 16 17 43 161 261 94 52 31 <br /> 26 28 19 23 16 16 19 48 169 281 90 49 31 <br /> 27 27 19 19 16 16 20 44 213 276 94 46 31 <br /> 28 27 19 20 16 16 18 64 250 257 90 46 30 <br /> 29 27 18 20 15 --- 17 91 238 241 82 44 29 <br /> 30 25 22 23 13 --- 16 105 259 226 82 40 30 <br /> 31 26 --- 21 16 --- 16 --- 286 --- 83 44 --- <br /> <br />TOTAL 941 596 579 526 451 454 951 6627 8096 4391 2317 1260 <br />MEAN 30 20 19 17 16 15 32 214 270 142 75 42 <br />AC-FT 1870 1180 1150 1040 895 901 1890 13140 16060 8710 4600 2500 <br />MAX 42 29 23 21 19 20 105 354 376 217 112 59 <br />MIN 24 15 13 12 15 12 16 125 162 82 40 29 <br /> <br />CAL YR 2000 TOTAL 0 MEAN 0 MAX 0 MIN 0 AC-FT 0 <br />WTR YR 2001 TOTAL 27189 MEAN 74.5 MAX 376 MIN 12 AC-FT 53930 <br /> <br />MAX DISCH: 400 CFS AT 03:15 ON May. 18, 2001 GH 4.38 FT. SHIFT -0.05 FT. <br />MAX GH: 4.38 FT. AT 03:15 ON May. 18, 2001 <br /> <br />FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY RECORD. <br /> <br /> <br />0 <br />100 <br />200 <br />300 <br />400 <br />O ct N o v D ec Jan F eb M ar A pr M ay Jun Jul A ug S ep <br />