There aren't many options that time of year. If you were hoping for a small stream, they will all be closed by then. If you want trout, Fish Lake or the Yakima River are your two closest options. The Wenatchee will hopefully still be open for steelhead but check the Emergency Regs to ensure it's still open and to learn the special requirements (ie. special endorsement, hatchery retention requirement, etc.) https://fortress.wa.gov/dfw/erules/efishrules/erule.jsp?id=950 Have fun; it's a very pretty time of year in Leavenworth, there just aren't many fishing options.