This Supplemental Environmental Assessment (EA) has been prepared for the Cherry Creek Native Fish Introduction Project. This Supplemental EA clarifies the original 1998 EA and proposes that Montana Fish, Wildlife & Parks (FWP) have the latitude to use rotenone in Cherry Lake, should the need arise. Treatments in 2003 and 2004 using antimycin did not result in a complete eradication of Yellowstone Cutthroat Trout in the lake as anticipated in the 1998 EA. *Note - Hardcopies of Appendix B are avaliable by request at: FWP 1400 S 19th Ave. Bozeman, MT 59718 (406) 994-4042 *Please note the following correction near the top of page 11 of this EA: "The calculation of the antimycin criteria is as follows: (0.0017 (instead of 0.5) mg/kg-day (RfD) * 70 kg (BW)/(2L/day (DI)) Based on a maximum concentration of 12 ppb that will be used in this project, the maximum concentration that would occur in Cherry Lake is 12 micrograms/L, which is 5 (instead of 1,458) times less than the safe level calculated by DEQ. This is the same concentration that has been used in Cherry Lake in 2003 and 2004."