St. Joe

Watershed Hydrology

The St. Joe watershed (HUC 17010304) covers an area of approximately 1,329 square miles in northern Idaho. The hydrology of the watershed is dominated by the St. Joe River and its tributaries. The area receives significant snowfall during the winter months, with snowpack typically peaking in late March or early April. Surface water in the watershed is of high quality and supports a variety of fish species, including cutthroat, rainbow, and bull trout. There are several reservoirs in the watershed, including the St. Joe River Reservoir, which is primarily used for hydroelectric power generation. Interesting climatic trends in the watershed include an increase in average temperature and a decrease in snowpack over the past few decades. These trends are likely to have significant impacts on the hydrology and ecology of the watershed in the coming years.


Surface Flows

St. Joe Watershed

Snowpack Depths

St. Joe Watershed

Dams & Reservoirs

St. Joe Watershed

Groundwater Levels

St. Joe Watershed

St. Joe Rivers

Rivers of the Watershed