The Middle Des Moines Watershed (HUC 07100004) covers an area of approximately 2,735 square miles in north-central Iowa. The watershed is characterized by a mixture of agricultural land, wetlands, and urban centers. Surface water resources in the watershed include the Des Moines River and several smaller streams and tributaries. The hydrology of the watershed is influenced by the flat terrain and extensive agricultural land use. Runoff from agricultural fields can contribute to surface water pollution and degradation, especially during heavy rainfall events. Snowpack is generally limited in the watershed due to its location in the Midwest. Reservoirs within the watershed include Lake Red Rock and Saylorville Lake, which provide flood control, recreation, and water supply to the region. Interesting climatic facts and trends for the watershed include the increasing frequency of heavy rainfall events and the potential for increased flooding and nutrient pollution. Climate change may also impact the hydrology and ecology of the watershed in the future.