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Scientific i valtiatlon of Riologaenl Opinions on P.ndangomd and ThrenternGd r-khe% In the Klamath RiverTlivirt: f 0tailn Report (2002) <br />hrcl �r . nnp. cdUfn�enhnnWY ,illWl7lib4'uhrinu! 1•ncml, c�jryught y)I12 7AW The 14ellnn9l A{ YXMY'N S.ICnL X all rIgl,w •sacn-cd <br />prospect of increasing the viability of the sucker populations, and thus seem justified. <br />RcconmmeEllee ti.ons on water level are more difficult to evaluate, however. <br />Fi 2 shows the water levels given by USFWS in its RPA (200 1) as well as <br />two other level regimes (USER recommended and historical). The USFWS <br />requirement's are given as absolute minima, i.e., they do not vary from one type <br />of water yeir to another. In contrast, assessment proposals of the USSR are fi ned in <br />terms of various categories of water year; categories shown in Figure 2 are characterized <br />as critically] dry (lowest 4 %) and dry (approximately 12% of years just wetter than the <br />critically dry ones). <br />4143 <br />4142 <br />4141 <br />4140 <br />4139 <br />413E <br />4137 <br />413E <br />000 0 <br />#e oa • <br />� bc000 <br />see <br />g0oo a <br />se 0 — <br />4 0000 <br />I <br />•A r.. <br />9svG0.o ., q <br />aese.� <br />I 0 <br />00909 Q <br />#000 <br />---L <br />i <br />00004 <br />♦ss• <br />*COOT <br />use• <br />i <br />L -- <br />000 spay ai Run 0000 <br />Oct I Nov I Disc I Ian I Feb I Mar <br />s Dry Water Years, U5BR proposed <br />o Critical Dry Water Years, USBR proposed <br />Mean., 5 Dry Water Years, 1960 -1998 <br />— — Mean, 2 Critical Dry Water Years, 1960 -1998 <br />Q USFWS Biological opirtim <br />Figure 2. overview of monthly levels for Upper Klamath Lake proposed by USSR <br />through its biological assessment of 2001, USFWS through its biological <br />opinion of 2001. and observed conditions for the years 1960 —1998. <br />Hydrologic categories used by USBR in its proposals (dry years, critical dry <br />years) are explained in the text. Mean depths, excluding wetlands, <br />corresponding to water levels are approximately as follows (feet): 4137 = 3.5; <br />4138 = 4.0; 4139 = 4.8; 4140 = 5.7-,4141 — 6.6; 4142 = 7.6 (Welch and Burke <br />2001, Figure 2 -5). <br />11 <br />966 —d BEOON A 982-1 999E999E06 s3oNnosm innIVN 100 —woad IV: H ZOOZ- 80 -93d <br />