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STATE OF COLORADO <br />plchard D. Lemm, Governor <br />DEPARTMENT OF NATURAL RESOVRCES <br />DIVISION OF WILDLIFE <br />• Jack R. Grleb, Dlreclor <br />6060 Broatlway <br />Denver, Coioratlo 60216 626-1192 <br />June 6, 1983 <br />Mr. Scott Jones <br />Environmental Coordinator <br />Snowmass Coal Company <br />PO Box 980 <br />Carbondale Colorado 8167.3 <br />Dear Scott, <br />RE~E1~~D <br />JUN ~ <br />w~~ ~^` gym. <br />C~1A RAGG <br />3sp~'; ~o <br />.yoPw v <br />Thank you for the opportunity to review the data for Snowmass Coal Company's <br />proposed fish ladder/weir design for North Thompson and Middle Thompson Creeks <br /> <br />The basic design concept is acceptable and adequate except that the: actual ladders <br />need to be extended either in width or length or both as the dimensions during high <br />water flows appear to be minimal. <br />1 recommend either extending the fish ladder downstream (require extended splash <br />plate under ladder) or extend the length of the fish ladder from seven feet to a minimum <br />of twelve feet or to the edge of the side~vall of the weir. The notches in the ladder <br />should be off set to correspond with the center of the seven foot wide upper notch. <br />This would allow a more adequate resting area out of the main flow of the creeks. <br />No removal of the overstory should occur and any riparian vegitation removed <br />during construction should be anchored in r-he pool created and below the mid water <br />line to provide habitat for aquatic insect forms. <br />The bottom oC the upstream pool which is created by the weir should have natural <br />rock configurations with large boulders for resting/escape cover (hottom should not <br />be graded, leveled, smoothed etc. ). <br />If the Colorado Division oC Wildlife can be of further assistance or if more information <br />is needed please feel free to call on us. <br />Sincerely, /J ~ A~ed <br />C4~'L2~a C/I ~JCJ'Gk: C ~"~~ <br />ames O. Goodyear / John Seidel <br />District Wildlife Manager Area Wildlife Manager <br />0323 Elk Range Drive <br />Carbondale Colorado 81623 <br />i'4- <br />1{IL <br />~f <br />,f <br />DEPARTMENT OF NATURAL RESOURCES, Monte Pascoe. E.ecut~~e Director WILDLIFE COAIMISSION,W~Ibur Redden, Chairman <br />Donald Fernandez. Vice Chahmon • James Smith, Sec~etary • Jean K. Tool, Alember Vernon C. WilLoms. Member <br />An..6rnl H,nhrr f.lr mbar Snm Cn,iti.l Mc•n bei • Rrthmd Drvebi5~, hle tuber <br />