The Otter and Morrey Creek watershed drains to the Wisconsin River in northwest Iowa County. The streams in this watershed have a high gradient. Most of the streams support trout, although nonpoint sources of water pollution are suspected to affect water quality, habitat and recreational use.
Agriculture is the predominant land use in the watershed.
Significant acreage in the watershed is woodland. Away from the Wisconsin River floodplain there are few wetlands, mostly wet meadows which are grazed or cultivated adjacent streams. There are large wetland complexes along the Wisconsin River particularly near Avoca, which are very important for wildlife. The portion of the watershed on the Wisconsin River floodplain is also in an atrazine management area. Elevated levels of atrazine, a herbicide used on corn, has been found in some tested private water wells.