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20 <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. December 11, 2001 and January 24, 2002 appear to have ice effect on the <br />chart but in reality do not. The record is good. Station maintained and record developed by Merlin <br />Friedrichsen. <br /> <br />RATING TABLE.--SVCLYOCO22 USED FROM 01-OCT-2001 TO 22-OCT-2002 <br /> <br /> DISCHARGE, IN CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 <br /> MEAN VALUES <br /> <br /> DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br /> <br /> 1 29 12 16 14 14 11 17 92 168 63 39 15 <br /> 2 28 11 16 14 13 11 16 71 142 73 39 13 <br /> 3 26 15 15 14 13 12 13 41 132 74 52 14 <br /> 4 25 13 15 14 14 15 15 47 135 70 52 16 <br /> 5 28 13 14 13 14 14 14 48 84 67 56 14 <br /> 6 29 12 16 13 14 13 14 50 73 74 67 13 <br /> 7 26 11 13 14 14 13 14 54 86 80 67 14 <br /> 8 26 17 12 14 13 12 15 57 107 92 58 16 <br /> 9 24 16 15 14 13 13 17 51 103 83 44 24 <br /> 10 26 14 16 15 12 14 14 48 103 78 46 37 <br /> 11 26 17 22 14 13 13 15 49 133 74 41 33 <br /> 12 24 17 15 14 13 13 14 62 112 66 38 47 <br /> 13 24 14 9.8 14 14 13 13 55 104 67 41 53 <br /> 14 26 13 11 12 13 15 10 53 116 65 38 42 <br /> 15 28 12 13 14 13 14 13 46 146 60 28 39 <br /> 16 25 14 16 15 13 14 21 61 148 54 23 33 <br /> 17 18 12 16 13 14 14 23 65 141 51 25 36 <br /> 18 12 14 15 12 14 14 26 68 132 45 22 40 <br /> 19 13 16 14 11 13 12 40 77 131 38 18 34 <br /> 20 17 14 15 13 13 11 42 92 138 35 17 27 <br /> 21 16 15 14 15 14 12 41 101 134 45 21 25 <br /> 22 14 17 11 14 14 12 38 86 130 43 21 26 <br /> 23 13 16 12 13 13 12 36 66 124 43 17 23 <br /> 24 14 15 13 13 13 14 36 75 120 44 19 20 <br /> 25 12 13 15 15 12 16 41 63 117 41 18 23 <br /> 26 16 16 16 14 12 12 46 67 109 37 16 23 <br /> 27 16 13 14 13 13 12 50 63 96 35 17 22 <br /> 28 16 11 13 13 13 13 48 68 83 33 21 23 <br /> 29 16 13 13 14 --- 12 41 73 66 31 17 21 <br /> 30 15 15 12 15 --- 12 74 92 65 36 15 18 <br /> 31 14 --- 11 14 --- 13 --- 132 --- 39 17 --- <br /> <br />TOTAL 642 421 438.8 424 371 401 817 2073 3478 1736 1010 784 <br />MEAN 21 14 14.2 14 13 13 27 67 116 56 33 26 <br />AC-FT 1270 835 870 841 736 795 1620 4110 6900 3440 2000 1560 <br />MAX 29 17 22 15 14 16 74 132 168 92 67 53 <br />MIN 12 11 9.8 11 12 11 10 41 65 31 15 13 <br /> <br />WTR YR 2002 TOTAL 12595.8 MEAN 34.5 MAX 168 MIN 9.8 AC-FT 24980 <br /> <br />MAX DISCH: 190 CFS AT 00:45 ON Jun. 1, 2002 GH 3.8 FT. SHIFT 0 FT. <br />MAX GH: 3.8 FT. AT 00:45 ON Jun. 1, 2002 <br /> <br />FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY RECORD. <br /> <br />0 <br />50 <br />100 <br />150 <br />200 <br />Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep <br />