Upper John Day

Watershed Hydrology

The Upper John Day Watershed covers approximately 1,800 square miles and is located in eastern Oregon. Hydrology in the watershed is largely influenced by the region's unique geology, which includes volcanic rock formations and steep hillsides. Snowpack in the watershed is critical for water supply, with the highest snowpack levels typically occurring in February and March. Surface water in the region is heavily utilized for irrigation and domestic use. Reservoirs in the area also play an important role in regulating water flow and supply. Interesting climatic trends in the watershed include warming temperatures, decreased snowpack, and increased wildfire activity in recent years. The area has also experienced more extreme precipitation events, leading to enhanced flood risk in some areas. These changes highlight the importance of continued monitoring and adaptive management in the Upper John Day Watershed.


Surface Flows

Upper John Day Watershed

Snowpack Depths

Upper John Day Watershed

Dams & Reservoirs

Upper John Day Watershed

Groundwater Levels

Upper John Day Watershed

Upper John Day Rivers

Rivers of the Watershed