Broad-St. Helena

Watershed Hydrology

The Broad St. Helena watershed (HUC 03050208) covers an area of approximately 1,950 square miles in southwest Montana. The hydrology of the watershed is characterized by cold, mountainous terrain and a high annual snowpack that feeds into the Missouri River. Surface water in the watershed is dominated by numerous streams and rivers, including the Big Hole, Beaverhead, and Ruby Rivers. The watershed also contains several reservoirs, including Clark Canyon and Barrett Reservoirs, which are used for irrigation, flood control, and recreation. Interesting climatic facts include the region's high elevation and continental climate, which result in cold winters and warm summers. Recent trends in the region include decreased snowpack and earlier runoff timing, which can impact water availability for communities and agriculture in the watershed.


Surface Flows

Broad-St. Helena Watershed

Snowpack Depths

Broad-St. Helena Watershed

Dams & Reservoirs

Broad-St. Helena Watershed

Groundwater Levels

Broad-St. Helena Watershed

Broad-St. Helena Rivers

Rivers of the Watershed