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Table 3. Key provisions and components of the procedures for Stocking Nonnative Fish 5necies in the Upper Colorado River Basin discussed with the Colorado Wildlife Commission 8 August 97 potentially requiring regulatory attention Page numbers and items referenced refer to the finalized Procedures (Appendix A). BCR= black crappie, BGL=bluegill, CCF=channel catfish, FHM=fathead minnow, LMB=largemouth bass, MSF=mosquitofish, and TGC =-triploid grass carp. Provision, location or situation Page no: Wildlife Commission regulatory section action No trout stocking in riverine Critical 2 N 5 Critical Habitat definition Habitat of Upper Colorado River Basin . . . regulation required Stocking only BCR, BGL, LMB & TGC in (2) A B 3 5: N Regulation, to define and in 50 flood lain ., . . . 50 flood lain Berming and screening prerequisite for Berm and screen specification and stocking warmwater sport fish in 50 yr 5: IV.3.A.,B.(2) situation flood lain regulation required Stock LMB, BCR, BGL, MSF, TGC above 7: N.3.B.4. Regulation required 50 fllain Isolated waters above 6,500' msl and above S 7: N Isolation definition regulation 100 fl lain: CCF, FHM . . required Highline and Elkhead reservoir outlet B 6 8: IV 3 Screen specification Screen specification screens . . . No stocking of nonnative, nonsalmonid fishes in rivers within Critical 10: V11. 1. Regulation required Habitat No stocking of nonnative, nonsalmonids in rivers having direct connection to Critical 10: VII. 1. Regulation required Habitat Prohibited fish species 10: V11.3. Regulation required Transplanting of nonnative Regulation defining warmwater sport fish salvaged from rivers 11: VIII.2. waters eligible to receive transplants Five year review of Lake Management 16: X.2.B.(3). Corrective provisions? Plans A Low Effort System for Planned Coolwater and Coldwater Reservoirs Some of the key physical characteristics of an "enlarged" Elkhead Reservoir include a new surface area of 1,080 acres, 18 miles of shoreline, a capacity of 37,00 acre-feet, a mean depth of 34.3 feet (10.5 m) and a shoreline development factor of 4.009 (E. Bergersen, Colorado Cooperative Fish and Wildlife Research Unit, personal communication). The five digit reservoir score for each fish species catergory and the corresponding "suitability" description is given in Table 4. In summary, an enlarged version of Elkhead reservoir would be little changed from the present reservoir environment. However, it is important to note 10