South Grand

Watershed Hydrology

The South Grand Watershed (HUC 10290108) is located in northeastern Oklahoma and covers approximately 1,340 square miles. The hydrology of the watershed is dominated by the Grand River, which is the largest tributary of the Neosho River. The South Grand Watershed receives an average annual precipitation of 40-45 inches, with winter snowfall being a significant contributor to the water budget. The watershed contains several small reservoirs, which are primarily used for recreational purposes. The water quality in the South Grand Watershed is affected by agricultural activities and urban runoff. Interesting climatic facts and trends in the region include an increase in average temperatures and a decrease in the number of extreme cold events. Additionally, the frequency and intensity of droughts have increased in recent years, leading to concerns about water availability in the watershed.


Surface Flows

South Grand Watershed

Snowpack Depths

South Grand Watershed

Dams & Reservoirs

South Grand Watershed

Groundwater Levels

South Grand Watershed

South Grand Rivers

Rivers of the Watershed