Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Walla Walla River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the Walla Walla River, the highest being situated at an altitude of ft, the .

The Walla Walla River is a tributary of the Columbia River that originates in the Blue Mountains of northeastern Oregon and flows through southeastern Washington. It has a length of 62 miles and a watershed of approximately 1,758 square miles. The river's hydrology is influenced by snowmelt, precipitation, and groundwater. It is home to several reservoirs, including Bennington Lake and Little Walla Walla Reservoir, which are used for irrigation, flood control, and recreation. The river supports agricultural activities such as wheat farming and wine production, as well as recreational activities such as fishing and boating. The river has a rich history, with evidence of human habitation dating back 10,000 years. Today, it remains an important resource for both the natural environment and the local communities.