Lower Great Miami

Watershed Hydrology

The Lower Great Miami Watershed (HUC 05080002) covers an area of 1,890 square miles in southwestern Ohio. It is characterized by a humid continental climate with hot summers and cold winters. The hydrology of the watershed is dominated by the Great Miami River, which is fed by numerous tributaries. The river is a vital source of drinking water for several cities, including Dayton and Hamilton. The region receives an average snowfall of 25 inches per year, with the heaviest snowfall occurring in January and February. Surface water in the watershed is monitored for various constituents, including nutrients, bacteria, and sediment. The watershed is also home to several reservoirs, including the Miami Conservancy District's five dry dams, which provide flood protection to the region. Recent climatic trends indicate a slightly warmer and wetter climate, with an increase in heavy precipitation events.


Surface Flows

Lower Great Miami Watershed

Snowpack Depths

Lower Great Miami Watershed

Dams & Reservoirs

Lower Great Miami Watershed

Groundwater Levels

Lower Great Miami Watershed

Lower Great Miami Rivers

Rivers of the Watershed