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Draft North & East Metro Groundwater Management Area Plan 2-9 <br /> levels. Further downstream, springs from the surficial aquifer flow into the stream and create marginal <br /> conditions for brown trout. Where the stream begins to flow down into the St. Croix Valley, it intercepts <br /> groundwater from bedrock aquifers and conditions become most suitable for trout. Brown's Creek is <br /> currently listed as impaired for aquatic life due to a fish community that includes many warmwater fish <br /> species.The brown trout population occasionally shows some natural reproduction, but is <br /> supplemented by annual stocking of yearling trout to maintain a population that is large enough to <br /> support a fishery. <br /> There are seven streams in Washington County that have not yet been designated as trout streams but <br /> that support small populations of trout and other coldwater organisms (Figure 2-6). Most are completely <br /> surrounded by private land.The MPCA classifies these streams as coldwater streams for water quality <br /> and aquatic life standards. <br /> Six of these streams are in northern Washington County in the vicinity of Falls, Gilbertson, and Willow <br /> Creeks, and are similar in their geology and fish communities.The exception is Trout Brook near Afton <br /> State Park. It is similar to Brown's Creek, in that it originates as a warmwater stream that is cooled by <br /> groundwater from deeper aquifers as it flows into the St. Croix Valley.Trout Brook has a fish community <br /> of warmwater species, as well as a low-density brown trout population. <br /> P37 <br />