The West Nishnabotna Watershed (HUC 10240002) covers about 1,010 square miles in southwestern Iowa and northwestern Missouri. The watershed is primarily agricultural, with corn and soybean production as the dominant land use. The hydrology of the watershed is characterized by several small tributaries that feed into the West Nishnabotna River. The area receives an average annual precipitation of about 33 inches, with winter snowfall contributing to the surface water in the spring. The watershed contains several small reservoirs, which are used for irrigation and recreation. The reservoirs are typically shallow, with high nutrient concentrations due to agricultural runoff. The climate in the watershed is characterized by hot summers and cold winters, with an increasing trend in average annual temperatures over the past few decades. The region is also prone to severe thunderstorms and flooding events.