The Coldwater Watershed, located in Washington state, has a land area of approximately 176 square miles. The hydrology of the area is dominated by the Naches River, which originates in the Cascade Mountains and eventually flows into the Columbia River. The watershed experiences significant snowpack accumulation in the winter, which melts in the spring and contributes to streamflow. Surface water in the watershed is of high quality and supports various fish species, including chinook salmon and steelhead trout. The watershed contains several small reservoirs, which are used for irrigation and domestic water supply. Interesting climatic facts include the fact that the area receives an average of 100 inches of snowfall each year, and has experienced several significant flooding events in recent history. Climate trends in the area indicate an overall warming trend, which could have implications for snowpack accumulation and streamflow in the future.