The Detailed Implementation Plan for Water Resource Inventory Area (WRIA) 55/57 (Middle and Little Spokane Watershed) provides a framework for implementing strategies presented in the 2006 WRIA 55/57 Watershed Plan and evaluating their effectiveness. Developing the WRIA 55/57 Watershed Plan was Phase 3 of the planning process outlined in Washington’s 1998 Watershed Planning Act. Implementation of the watershed plan represents Phase 4, the first year of which is focused on developing the detailed implementation plan. To prepare the implementation plan, the watershed plan actions were ranked to develop priorities and a schedule for implementation.