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<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.--212 mi². <br /> <br />GAGE.--Water-stage recorder with satellite telemetry in timber shelter. The DCP is the primary record with <br />chart recorder as backup. <br /> <br />REMARKS.--Record is complete and reliable. Graphic chart record was used on Jul. 24-26, and Aug. 11, 1994. <br />Record is good. Station maintained and records developed by Fred Renner. <br /> <br />RATING TABLE.--SVCLYOCO20 USED FROM 01-OCT-1993 TO 30-SEP-1994 <br /> <br />DISCHARGE, IN CFS, WATER YEAR OCTOBER 1993 TO SEPTEMBER 1994 <br />MEAN VALUES <br /> <br /> DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br /> <br /> 1 39 33 22 16 16 19 43 166 590 209 98 58 <br /> 2 34 37 20 16 16 18 49 186 556 208 103 54 <br /> 3 29 41 19 17 18 18 48 196 414 220 105 45 <br /> 4 27 42 21 19 19 19 53 193 379 216 100 42 <br /> 5 24 40 21 18 17 19 58 189 316 196 101 37 <br /> 6 26 26 20 15 17 23 57 188 314 194 87 36 <br /> 7 27 25 19 18 18 23 60 231 309 179 74 32 <br /> 8 30 26 19 18 17 20 54 288 269 152 65 31 <br /> 9 35 26 14 18 17 20 57 297 320 126 67 29 <br /> 10 33 30 18 17 18 22 64 308 337 116 78 28 <br /> 11 31 28 19 18 17 20 63 305 307 117 74 30 <br /> 12 32 29 20 19 16 21 64 330 306 124 75 28 <br /> 13 34 29 19 15 16 20 84 358 327 121 84 29 <br /> 14 32 34 17 15 17 24 100 379 304 128 100 42 <br /> 15 29 29 21 17 16 22 91 363 291 123 85 41 <br /> 16 28 28 21 17 16 21 89 332 307 120 74 33 <br /> 17 35 29 20 16 16 24 97 349 308 119 66 31 <br /> 18 39 27 19 16 17 25 90 344 323 110 59 28 <br /> 19 41 26 21 18 16 28 90 269 371 105 56 27 <br /> 20 41 28 19 17 17 33 103 228 374 117 86 26 <br /> 21 39 25 20 17 17 29 135 220 381 119 82 35 <br /> 22 39 27 19 17 16 31 147 234 387 110 69 43 <br /> 23 38 28 21 15 15 32 175 233 395 107 60 40 <br /> 24 38 18 18 14 17 30 182 240 332 124 54 36 <br /> 25 37 20 20 15 15 33 194 242 274 112 49 28 <br /> 26 33 23 20 19 17 36 197 281 257 110 44 24 <br /> 27 27 24 20 19 18 31 167 283 244 110 43 25 <br /> 28 31 24 17 18 19 34 132 383 222 102 46 21 <br /> 29 30 23 14 18 --- 39 114 427 205 96 62 20 <br /> 30 22 22 12 18 --- 38 126 459 205 85 53 20 <br /> 31 30 --- 16 19 --- 39 --- 506 --- 84 49 --- <br /> <br /> TOTAL 1010 847 586 529 471 811 2983 9007 9924 4159 2248 999 <br /> MEAN 32.6 28.2 18.9 17.1 16.8 26.2 99.4 291 331 134 72.5 33.3 <br /> AC-FT 2000 1680 1160 1050 934 1610 5920 17870 19680 8250 4460 1980 <br /> MAX 41 42 22 19 19 39 197 506 590 220 105 58 <br /> MIN 22 18 12 14 15 18 43 166 205 84 43 20 <br /> <br /> CAL YR 1993 TOTAL 43654 MEAN 120 MAX 694 MIN 12 AC-FT 86590 <br /> WTR YR 1994 TOTAL 33574 MEAN 92.0 MAX 590 MIN 12 AC-FT 66590 <br /> <br /> MAX DISCH 874 CFS AT 2230 10-AUG-1994 GH 4.95 FT. SHIFT -0.07 FT. MAX GH 4.95 FT. AT 2230 10-AUG-1994 <br />0 <br />100 <br />200 <br />300 <br />400 <br />500 <br />600 <br />OctNovDecJanFebMarAprMayJunJulAugSep <br />