The Hoh-Quillayute watershed (HUC 17100101) is located on the Olympic Peninsula in Washington State and covers approximately 1,130 square kilometers. The area is characterized by steep mountains, dense forests, and many rivers and streams that flow into the Pacific Ocean. The hydrology of the area is largely influenced by snowmelt, with the highest elevations experiencing the most significant snowpack. Surface water in the watershed is of high quality and supports a diverse range of aquatic species. The watershed also contains a number of reservoirs, which are used for hydropower generation, recreation, and irrigation. Climatic trends in the area include relatively high rainfall and mild temperatures, with average annual precipitation ranging from 2500-4000 mm. Over the past few decades, there has been a trend toward drier conditions in the late summer and fall, which has led to concerns about water availability for irrigation and other uses. Overall, the Hoh-Quillayute watershed is an important ecological and hydrological resource that is valued by many stakeholders in the region.