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20 <br />PLATTE RIVER BASIN <br />06724000 ST. VRAIN CREEK AT LYONS, CO <br />LOCATION.--Lat 40013105", <br />long <br />105015'34", in NWkNWk sec. <br />20, T.3 N,, R.70 W., Boulder County, Hydrologic <br />Unit 10190005, on left <br />bank 75 <br />ft southwest of <br />U.S. <br />Highway <br />36 (State <br />Highways <br />7 and 66) at <br />southeast <br />edge of <br />Lyons, 400 ft <br />upstream from St. <br />Vrain <br />Supply <br />Canal, and <br />0.4 mi downstream <br />from <br />confluence of North and <br />South St. <br />Vrain Creeks. <br />DRAINAGE AREA AND <br />PERIOD <br />OF RECORD. --212 <br />mit. Aug. 1887 to <br />Sep. <br />1891, June 1895 to <br />current <br />year. Monthly <br />only data <br />for some periods. water quality data available <br />from Oct. <br />1977 to Feb. 1981. <br />GAGE.--Water-stage recorder <br />with <br />satellite telemetry in timber shelter. <br />The DCP is <br />the primary <br />record <br />with <br />chart recorder as <br />backup. Supplemental outside staff gage. <br />REMARKS. --Primary <br />record <br />is mean <br />daily data taken from the <br />chart <br />(October <br />5 -December <br />21; May <br />26 --June 2) <br />and <br />hourly data taken <br />from <br />satellite <br />monitoring with chart back up. <br />Mean daily <br />data for <br />January <br />11-14 <br />when both <br />chart and DCP <br />were down <br />was obtained from <br />the U.S.B.R. <br />satellite system (HYDROMET). <br />Chart <br />data was used when the <br />satellite <br />data was not decoded properly. <br />The record is complete and <br />reliable. <br />The <br />record is <br />good. Station maintained and record developed by Merlin <br />Friedrichsen. <br />RATING <br />TABLE.--SVCLY00O22 <br />USED FROM <br />01 -OCT -1999 TO 09 -OCT -2000 <br />DISCHARGE, IN CFS, <br />WATER YEAR OCTOBER <br />1999 TO SEPTEMBER 2000 <br />MEAN VALUES <br />DAY <br />OCT <br />NOV <br />DEC <br />JAN <br />FEB MAR <br />APR <br />MAY <br />JUN <br />JUL <br />AUG <br />SEP <br />1 <br />54 <br />21 <br />20 <br />22 <br />21 23 <br />42 <br />71 <br />493 <br />240 <br />83 <br />83 <br />2 <br />49 <br />20 <br />22 <br />23 <br />22 24 <br />46 <br />65 <br />429 <br />237 <br />82 <br />79 <br />3 <br />47 <br />26 <br />23 <br />20 <br />21 24 <br />44 <br />75 <br />356 <br />227 <br />82 <br />64 <br />4 <br />43 <br />22 <br />22 <br />17 <br />20 24 <br />45 <br />87 <br />399 <br />205 <br />81 <br />56 <br />5 <br />37 <br />21 <br />19 <br />22 <br />23 25 <br />52 <br />100 <br />405 <br />191 <br />77 <br />52 <br />6 <br />36 <br />20 <br />21 <br />17 <br />24 27 <br />60 <br />113 <br />378 <br />188 <br />75 <br />52 <br />7 <br />37 <br />20 <br />20 <br />17 <br />23 27 <br />56 <br />109 <br />378 <br />189 <br />70 <br />51 <br />8 <br />43 <br />19 <br />21 <br />20 <br />22 24 <br />57 <br />157 <br />379 <br />191 <br />63 <br />49 <br />9 <br />42 <br />17 <br />17 <br />21 <br />21 24 <br />54 <br />182 <br />398 <br />213 <br />57 <br />56 <br />10 <br />39 <br />19 <br />20 <br />21 <br />22 22 <br />62 <br />147 <br />383 <br />224 <br />55 <br />51 <br />11 <br />35 <br />19 <br />20 <br />20 <br />23 25 <br />62 <br />120 <br />327 <br />222 <br />56 <br />45 <br />12 <br />31 <br />18 <br />20 <br />20 <br />26 26 <br />55 <br />186 <br />311 <br />215 <br />58 <br />42 <br />13 <br />33 <br />18 <br />20 <br />19 <br />25 23 <br />50 <br />220 <br />321 <br />192 <br />59 <br />39 <br />14 <br />34 <br />17 <br />18 <br />20 <br />24 25 <br />52 <br />213 <br />296 <br />156 <br />55 <br />37 <br />15 <br />34 <br />17 <br />18 <br />22 <br />23 27 <br />65 <br />201 <br />278 <br />144 <br />52 <br />36 <br />16 <br />38 <br />18 <br />20 <br />21 <br />22 29 <br />62 <br />193 <br />290 <br />148 <br />56 <br />34 <br />17 <br />36 <br />19 <br />19 <br />22 <br />24 32 <br />59 <br />233 <br />269 <br />216 <br />72 <br />33 <br />18 <br />42 <br />19 <br />21 <br />20 <br />26 31 <br />53 <br />194 <br />231 <br />220 <br />93 <br />32 <br />19 <br />39 <br />17 <br />17 <br />26 <br />25 30 <br />60 <br />221 <br />215 <br />198 <br />79 <br />34 <br />20 <br />40 <br />20 <br />18 <br />25 <br />25 33 <br />56 <br />219 <br />392 <br />162 <br />68 <br />45 <br />21 <br />39 <br />22 <br />19 <br />17 <br />25 28 <br />45 <br />195 <br />334 <br />138 <br />65 <br />42 <br />22 <br />38 <br />24 <br />18 <br />22 <br />26 28 <br />50 <br />184 <br />274 <br />124 <br />64 <br />67 <br />23 <br />37 <br />18 <br />18 <br />19 <br />25 29 <br />73 <br />227 <br />258 <br />117 <br />65 <br />92 <br />24 <br />37 <br />16 <br />18 <br />25 <br />24 30 <br />70 <br />390 <br />251 <br />110 <br />60 <br />95 <br />25 <br />36 <br />21 <br />19 <br />21 <br />24 31 <br />64 <br />550 <br />261 <br />106 <br />56 <br />80 <br />26 <br />36 <br />27 <br />18 <br />20 <br />24 32 <br />54 <br />537 <br />276 <br />104 <br />58 <br />72 <br />27 <br />36 <br />26 <br />20 <br />20 <br />26 34 <br />58 <br />439 <br />286 <br />103 <br />58 <br />57 <br />28 <br />35 <br />27 <br />20 <br />18 <br />24 34 <br />65 <br />360 <br />277 <br />98 <br />55 <br />48 <br />29 <br />35 <br />23 <br />18 <br />18 <br />23 34 <br />72 <br />419 <br />260 <br />94 <br />67 <br />42 <br />30 <br />31 <br />22 <br />17 <br />17 <br />--- 38 <br />85 <br />617 <br />247 <br />89 <br />79 <br />41 <br />31 <br />25 <br />--- <br />17 <br />21 <br />--- 40 <br />--- <br />601 <br />--- <br />86 <br />81 <br />--- <br />TOTAL <br />1174 <br />613 <br />598 <br />633 <br />683 883 <br />1728 <br />7625 <br />9652 <br />5147 <br />2081 <br />1606 <br />MEAN <br />37.9 <br />20.4 <br />19.3 <br />20.4 <br />23.6 28.5 <br />57.6 <br />246 <br />322 <br />166 <br />67.1 <br />53.5 <br />AC -FT <br />2330 <br />1220 <br />1190 <br />1260 <br />1350 1750 <br />3430 <br />15120 <br />19140 <br />10210 <br />4130 <br />3190 <br />MAX <br />54 <br />27 <br />23 <br />26 <br />26 40 <br />85 <br />617 <br />493 <br />240 <br />93 <br />95 <br />MIN <br />25 <br />16 <br />17 <br />17 <br />20 22 <br />42 <br />65 <br />215 <br />86 <br />52 <br />32 <br />CAL YR <br />1999 TOTAL <br />0 <br />MEAN <br />0 MAX 0 <br />MIN <br />0 <br />AC -FT <br />0 <br />WTR YR <br />2000 TOTAL 32423 <br />MEAN <br />88.6 MAX 617 <br />MIN <br />16 <br />AC -FT <br />64310 <br />MAX DISCH: <br />688 CFS <br />AT 10:30 ON <br />May 30, 2000 GH 4.82 FT. <br />SHIFT <br />0.01 FT. <br />MAX GH: <br />4.82 FT. <br />AT 10:30 ON <br />May 30, 2000 <br />FOR MORE COMPLETE OR DETAILED INFORMATION SEE DAILY OR MONTHLY <br />RECORD. <br />800 <br />600 <br />400 <br />200 <br />0 <br />Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep <br />