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<br />, <br />, <br /> <br />Table 5. Summation of water temperatures (C) related to estimated Colorado squawfish spawning <br />dates, Colorado River (1979-1983) and Yampa River (1980-1984), Colorado. <br />Asterisk (*) means there was insufficent water temperature data. <br /> <br /> Colorado River a .Yampa River <br /> 1979 1980 1981 1982 1983 1980 1981 u 1982 c 1983 (\ 1984 e <br />Dates when maximum mainchannel water <br />temperatures first reached: <br />l8C 6/29 6/25 4/10 6/27 7/28 * 6/18 6/28 7/07 6/28 <br />20C 7/12 6/26 5/28 7/09 7/19 * 6/20 7/09 7/14 7/05 <br />22C 7/22 6/30 6/20 7/18 8/06 * 6/22 7/15 7/20 7/15 <br />Earliest estimated <br />spawning date f 7/16 7/16 7/03 7/15 7/27 7/02 7/06 7/24 7/11 7/04 <br />Maximum mainchannel water <br />temperature at earliest ...... <br />estimated spawning date 21.0 24.5 24.5 21.0 19.5 21.5 25.0 26.0 17.5 19.0 ....... <br />Number of days maximum <br />mainchanne1 water <br />temperature was: <br />~18C 85 * 117+ 84 75 * 102 86 77 85 <br />2'20C 61 88 83+ 84 59 * 92 71 65 67 <br />.?22C 26 66 68+ 46 37 * 76 59 57 48 <br />aUSGS Station 09163500 near Colorado-Utah state line <br />bUSGS Station 09251000 near Maybel1, Colorado <br />cUSGS Station 09260050 at Deer10dge Park, Colorado <br />dFie1d measurements plus USGS Deerlodge Park data <br />eCRFP field thermograph readings <br />fDerived from back-calculated age estimates of YOY <br />