Upper Henrys

Watershed Hydrology

The Upper Henrys Watershed (HUC 17040202) has a land area of approximately 157 square miles, located in south-central Montana. The hydrology of the watershed is largely influenced by snowmelt, with the majority of the streamflow occurring in the spring and early summer. The snowpack in the watershed is typically deep and persistent, with average snow water equivalent ranging from 20-30 inches. Surface water in the watershed primarily consists of streams and small lakes, with the major surface water reservoir being the Red Lodge Reservoir. The reservoir contains high levels of sediment due to erosion from surrounding hillsides. The climate in the watershed is characterized by cold winters and warm summers, with average annual precipitation of approximately 20 inches. Recent trends suggest an increase in average annual temperatures and a decrease in snowpack accumulation, which could have significant impacts on the hydrology and ecology of the watershed.


Surface Flows

Upper Henrys Watershed

Snowpack Depths

Upper Henrys Watershed

Dams & Reservoirs

Upper Henrys Watershed

Groundwater Levels

Upper Henrys Watershed

Upper Henrys Rivers

Rivers of the Watershed