The drainage of WRIA 55 is well-defined by hills surrounding the watershed. Discharge through a network of tributaries, including Dragoon, Deadman, and Dry Creeks as well as several others, is to the Little Spokane River that flows into the Spokane River downstream from the City of Spokane. The Selkirk Mountains (including Mount Washington) form the eastern boundary of the watershed that conveniently approximates the Washington-Idaho state boundary. The Huckleberry Range (including Blue Grouse, Look Lake, Scoop and Dunns Mountains) forms the western boundary of the WRIA 55.
The northern divide of the Little Spokane River pictured
above is a sand and gravel filled trough connected to the
Pend Oreille watershed. It is speculated that there is groundwater
flowing south through this trough from the Pend Oreille to
the Little Spokane River watershed. This groundwater flow
may be contributing to the maintenance of baseflows in the
headwaters of the Little Spokane River.