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<br /> <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 except for the following days: Mar. 4, 1995 when clock stopped <br />and DCP data was missing some values. Graphic chart record was used on Dec. 15; Jan. 1, 8, 20-25, <br />31; Feb. 1-9; Mar. 20, 27, 30; Apr. 1-4; May 7; Sep. 22, 1995. Record is good. Station maintained <br />and records developed by Fred Renner. <br /> <br />RATING TABLE.--SVCLYOCO20 USED FROM 01-OCT-1994 TO 30-SEP-1995 <br /> <br />DISCHARGE, IN CFS, WATER YEAR OCTOBER 1994 TO SEPTEMBER 1995 <br />MEAN VALUES <br /> <br /> DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP <br /> <br /> 1 25 23 20 15 18 16 24 317 1220 653 339 101 <br /> 2 33 22 20 18 19 17 21 250 1120 674 294 97 <br /> 3 35 23 21 18 18 17 19 245 1090 749 264 103 <br /> 4 36 24 21 14 18 15 21 242 879 640 250 96 <br /> 5 35 22 20 16 17 15 24 256 861 534 245 80 <br /> 6 33 26 21 16 15 17 24 270 1090 581 242 79 <br /> 7 34 24 20 16 18 17 24 238 1060 694 228 91 <br /> 8 36 25 17 17 19 18 23 199 1150 752 232 100 <br /> 9 34 22 13 18 18 19 26 199 1440 833 253 105 <br /> 10 31 23 17 18 17 18 35 208 1170 948 243 96 <br /> 11 30 24 21 18 17 20 32 209 889 909 234 83 <br /> 12 28 25 21 18 18 21 28 210 858 940 258 74 <br /> 13 27 24 20 18 19 21 24 202 969 846 246 63 <br /> 14 29 24 19 18 18 20 15 164 1100 810 225 56 <br /> 15 28 17 16 19 17 20 17 124 1350 673 196 48 <br /> 16 29 19 17 19 17 19 20 216 1410 598 177 43 <br /> 17 29 23 19 19 17 22 27 691 1260 550 164 40 <br /> 18 26 19 19 16 18 23 28 776 1090 544 164 41 <br /> 19 23 18 20 17 18 24 28 861 714 531 162 53 <br /> 20 27 21 19 15 19 23 21 885 592 569 167 64 <br /> 21 26 23 18 13 17 28 26 733 820 579 164 90 <br /> 22 23 19 17 14 16 32 26 599 920 471 171 72 <br /> 23 22 17 17 14 17 30 25 562 903 410 179 68 <br /> 24 24 21 16 17 16 33 25 538 816 355 171 69 <br /> 25 27 22 19 16 17 30 32 552 757 311 171 62 <br /> 26 26 22 20 15 18 33 54 594 739 278 165 53 <br /> 27 25 16 20 16 17 33 45 784 820 268 148 48 <br /> 28 23 14 18 17 16 32 57 872 857 248 134 43 <br /> 29 23 17 17 18 --- 30 139 1690 1010 225 123 42 <br /> 30 26 20 17 22 --- 28 330 1900 824 235 113 52 <br /> 31 25 --- 17 18 --- 30 --- 1510 --- 330 110 --- <br /> <br /> TOTAL 878 639 577 523 489 721 1240 17096 29778 17738 6232 2112 <br /> MEAN 28.3 21.3 18.6 16.9 17.5 23.3 41.3 551 993 572 201 70.4 <br /> AC-FT 1740 1270 1140 1040 970 1430 2460 33910 59060 35180 12360 4190 <br /> MAX 36 26 21 22 19 33 330 1900 1440 948 339 105 <br /> MIN 22 14 13 13 15 15 15 124 592 225 110 40 <br /> <br /> CAL YR 1994 TOTAL 33225 MEAN 91.0 MAX 590 MIN 13 AC-FT 65900 <br /> WTR YR 1995 TOTAL 78023 MEAN 214 MAX 1900 MIN 13 AC-FT 154800 <br /> <br /> MAX DISCH 4205 CFS AT 1800 29-MAY-1995 GH 7.85 FT. SHIFT -0.16 FT. MAX GH 7.85 FT. AT 1800 29-MAY-1995 <br />0 <br />500 <br />1000 <br />1500 <br />2000 <br />OctNovDecJanFebMarAprMayJunJulAugSep <br />