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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.--Record is complete and reliable. Graphic chart record was used on Feb. 14, 17, 21-28; Mar. 1-6; <br />Apr. 24; May 14-18, 1997. Record is good. Station maintained and record developed by Fred Renner. <br /> <br />RATING TABLE.--SVCLYOCO20 USED FROM 01-OCT-1996 TO 30-SEP-1997 <br /> <br />DISCHARGE, IN CFS, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997 <br /> MEAN VALUES <br /> <br /> DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br /> <br /> 1 120 49 28 25 27 23 66 319 723 450 273 88 <br /> 2 113 45 25 28 28 27 69 300 992 387 254 101 <br /> 3 115 42 24 28 26 26 61 272 1040 388 250 103 <br /> 4 150 42 27 23 24 24 59 282 964 373 267 109 <br /> 5 137 44 32 17 25 24 59 363 1060 386 283 105 <br /> 6 125 41 33 21 25 22 54 472 1140 381 314 103 <br /> 7 116 33 28 21 23 22 57 569 1550 363 267 93 <br /> 8 97 37 29 26 24 23 54 566 1390 354 223 86 <br /> 9 85 45 27 27 26 24 55 485 1500 351 189 80 <br /> 10 73 42 25 22 24 22 52 431 1370 351 250 79 <br /> 11 70 39 25 20 24 21 50 397 1330 380 264 78 <br /> 12 63 38 24 21 24 23 57 329 1260 331 300 77 <br /> 13 61 37 25 22 23 25 58 273 1180 289 284 70 <br /> 14 56 36 24 22 23 24 54 286 1030 282 218 71 <br /> 15 51 39 18 25 24 27 49 306 1060 278 190 71 <br /> 16 48 37 20 24 25 25 47 336 988 266 172 73 <br /> 17 53 34 18 23 26 27 48 375 932 265 170 73 <br /> 18 46 46 19 24 22 25 50 476 961 273 162 68 <br /> 19 55 45 23 25 21 25 65 550 1100 277 168 75 <br /> 20 59 40 29 25 22 28 74 528 1190 270 170 131 <br /> 21 45 41 28 24 23 37 93 486 1050 269 146 148 <br /> 22 42 39 27 22 22 38 101 571 984 275 138 132 <br /> 23 46 38 26 23 25 42 112 573 924 260 132 136 <br /> 24 51 34 23 23 22 49 165 608 787 276 115 153 <br /> 25 49 40 23 23 21 45 169 589 685 296 113 124 <br /> 26 50 39 25 25 23 51 182 516 614 264 121 101 <br /> 27 43 31 27 26 24 63 206 399 559 245 115 100 <br /> 28 44 26 24 25 22 69 288 297 529 236 114 96 <br /> 29 63 31 25 24 --- 71 381 283 515 208 108 89 <br /> 30 46 30 26 24 --- 66 366 365 473 204 105 78 <br /> 31 51 --- 24 28 --- 66 --- 497 --- 270 90 --- <br /> <br /> TOTAL 2223 1160 781 736 668 1084 3201 13099 29880 9498 5965 2891 <br /> MEAN 71.7 38.7 25.2 23.7 23.9 35.0 107 423 996 306 192 96.4 <br /> AC-FT 4410 2300 1550 1460 1320 2150 6350 25980 59270 18840 11830 5730 <br /> MAX 150 49 33 28 28 71 381 608 1550 450 314 153 <br /> MIN 42 26 18 17 21 21 47 272 473 204 90 68 <br /> <br /> CAL YR 1996 TOTAL 53726 MEAN 147 MAX 934 MIN 17 AC-FT 106600 <br /> WTR YR 1997 TOTAL 71186 MEAN 195 MAX 1550 MIN 17 AC-FT 141200 <br /> <br /> MAX DISCH 1640 CFS AT 0515 07-JUN-1997 GH 5.89 FT. SHIFT -0.22 FT. MAX GH 5.89 FT. AT 0515 07-JUN-1997 <br /> <br /> FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY RECORD. <br /> <br />0 <br />500 <br />1000 <br />1500 <br />2000 <br />OctNovDecJanFebMarAprMayJunJulAugSep