The Muddy Creek Sub-watershed, located just west of Morris has a drainage area 144 square miles. The primary use of this land has been cropland interspersed with some pasture and a few feedlots. Lake Hattie is the only water body that is labeled as impaired. The main steam of Muddy Creek, from Chokio west is channelized, and from Chokio east it is listed as a Class 7 stream (of limited resource value). At this time, no assessments have been made to determine impairments in these waters. Some data listed in the PdT Monitoring and Assessment report suggest that a more robust collection of information may result in impairments.
Hattie Lake is shallow and hyper-eutropic. There are several outlets and inlets to Hattie, many of which would be categorized as channelized streams or ditches as well as an unknown number if tile outlet influences. High phosphate levels, chlorophyll levels, and low secchi disk readings have been common on Hattie for many years. Agricultural row crops predominantly surrounds the area with an observed lack of adequate buffers around the lake. An increases in buffering could aid in the reduction of nutrient inputs that impair this lake.