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FIGURE 3. DALTON PIT -- <br />Thalweg Changes Since 1977 <br />(Preliminary, Approximate) <br />6570 <br />6560 <br />c <br />0 <br />.' <br />d <br />W <br />6550 <br />6540 - <br /> <br />Trimble ~ '~ <br />Bridge Ate. <br /> <br /> ~.. <br />~. • ,. <br /> / <br />..... <br /> <br />--- <br />------- _------ . <br />! <br />. ~--- f-~--- <br />' . ~-- <br />- <br /> <br /> ~ ~. .~ <br />.....er1 <br /> / .........~ SC-1 <br />" <br />"' _ <br />i <br />~ ~ <br />i /~ .' <br /> <br />SC-16 ~ = Q <br />+ ~ <br />~ <br />- o <br />' <br />- - ~~ <br />r ,. <br />m <br />77.0 77.2 77.4 77.6 <br />~- 1977 (USAGE flood study) <br />- ~~-~ _ 1990 (Goff, 1992a) <br />~+ 11-12/93 (Sandco) <br />- ~ - 12/96 pre-mining (Sandco) <br />--~-- 12/97 pre-mining (Sandco) <br />~ 11/02 pre-mining (Sandco) <br />1977 River Mile <br />77.8 78.0 78.2 <br />Nate: Horizontal placement of Dalton cross sections is based <br />on data provided by Sandco and may be more accurate than far <br />Bar-D and Hermosa Meadows Pits; thus, apparent gradients <br />between cross sections and apparent elevation changes with <br />respect to earlier data may be more accurate than in Figures 1 <br />and 4. Vertical placement of Dalton crass sections is accurate, <br />so recent thalweg elevation changes are shown accurately. <br /> <br />Gillam to Hellige 11/28/03 <br />