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19 <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.-- Manometer stage sensor and satellite monitoring DCP in a wooden shelter, with no stilling well. <br />Primary reference is an outside chain gage. Chart back up exists for periods when the manometer was <br />operating. The manometer was used October 1, 2003 to November 19, 2003. Beginning November 19, <br />2003,graphic water stage recorder and satellite monitoring DCP and shaft encoder in a wooden shelter <br />with a stilling well, about 20 ft above the old gage. Primary reference is an electric drop tape <br />down from an RP with the outside chain gage as backup. The DCP log is the primary record with the <br />graphic chart as back-up. This setup was used for the remainder of the 2004 water year. <br /> <br />REMARKS.--From October 1 to November 19, 2003, primary record is hourly data taken from satellite <br />monitoring using the manometer. This record is complete and reliable except for: November 3 when the <br />shaft encoder and chart both failed; November 18-19, when the new station was being installed; <br />November 24, 2003 thru March 8, 2004 when the station was closed for winter. For the new gage, the <br />primary record is hourly satellite data with chart back up from the well. The record is complete and <br />reliable. The record is good, except for November 3, 18, 19, 2003; and November 24, 2003 to March <br />8, 2004, which were estimated and are poor. Station maintained and record developed by Merlin <br />Friedrichsen. <br /> <br />RATING TABLE.--SVCLYOCO23 USED FROM 01-OCT-2003 TO 30-SEP-2004 <br /> <br /> DISCHARGE, IN CFS, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004 <br /> MEAN VALUES <br /> <br /> DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br /> <br /> 1 28 15 15 10 10 15 27 112 224 671 162 69 <br /> 2 30 16 16 10 10 15 30 111 218 519 188 65 <br /> 3 32 18 16 9 10 15 37 104 218 426 189 61 <br /> 4 32 17 17 9 11 15 34 129 236 353 171 60 <br /> 5 30 16 17 8 12 15 38 165 245 314 171 67 <br /> 6 28 17 18 8 12 15 43 189 209 305 167 65 <br /> 7 28 17 18 7 12 15 40 220 241 308 157 57 <br /> 8 26 19 18 6.5 12 15 37 252 304 293 141 52 <br /> 9 24 16 19 6.1 12 15 50 237 368 262 135 50 <br /> 10 24 18 19 6 12 17 55 251 352 253 126 47 <br /> 11 28 16 19 6 13 16 55 288 298 265 108 50 <br /> 12 24 17 18 6 13 15 71 287 306 245 102 49 <br /> 13 20 17 18 6 13 16 89 266 296 239 94 48 <br /> 14 22 17 18 6 13 17 136 254 297 239 84 48 <br /> 15 21 16 17 6 0 17 158 247 294 248 87 47 <br /> 16 19 16 17 7 14 15 147 241 314 293 82 45 <br /> 17 19 17 17 7 14 14 151 215 318 316 72 44 <br /> 18 17 16 16 7 15 12 145 183 379 291 95 44 <br /> 19 15 16 16 7 15 16 130 220 512 260 212 46 <br /> 20 16 16 15 7 15 17 119 274 472 263 199 44 <br /> 21 18 16 15 7.5 15 19 118 292 464 247 196 59 <br /> 22 16 15 14 7.8 15 19 95 301 526 252 168 67 <br /> 23 17 13 14 8 15 20 96 283 379 416 152 63 <br /> 24 19 13 13 8 15 26 92 273 325 525 132 57 <br /> 25 21 13 13 8 15 29 111 255 318 383 114 58 <br /> 26 20 14 12 8 15 30 111 245 328 304 99 58 <br /> 27 21 14 12 8 15 32 121 253 373 255 99 59 <br /> 28 19 14 11 9 15 32 123 290 439 226 104 63 <br /> 29 23 14 11 9 15 30 120 334 420 217 90 58 <br /> 30 22 14 11 9 --- 30 120 309 598 192 79 63 <br /> 31 20 --- 11 9 --- 29 --- 268 --- 178 73 --- <br /> <br />TOTAL 699 473 481 235.9 373 603 2699 7348 10271 9558 4048 1663 <br />MEAN 23 16 16 7.6 12.9 20 90 237 342 308 131 55 <br />AC-FT 1390 938 954 468 740 1200 5350 14570 20370 18960 8030 3300 <br />MAX 32 19 19 10 15 32 158 334 598 671 212 69 <br />MIN 15 13 11 6 0 12 27 104 209 178 72 44 <br /> <br />WTR YR 2004 TOTAL 38451.9 MEAN 105 MAX 671 MIN 0 AC-FT 76270 <br /> <br />MAX DISCH: 722 CFS AT 01:00 ON Jul. 1, 2004 GH 2.91 FT. SHIFT 0.01 FT. <br />MAX GH: 2.91 FT. AT 01:00 ON Jul. 1, 2004 <br /> <br />FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY RECORD. <br /> <br />0 <br />500 <br />1000 <br />Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep