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City of Arden Hills – 2040 Comprehensive Plan <br /> <br /> <br />Approved:, 2018 <br />10-11 <br />o Hydrologic Restoration: National wetland inventory (NWI) data and ditch <br />inventory data were used to identify wetlands with the potential for <br />hydrologic restoration. The location of partially drained wetlands in the <br />NWI data and the location of known ditches were used to identify wetlands <br />that have been partially drained and could be restored to more natural, <br />flow through hydrology without necessarily changing the hydrologic <br />regime. Only polygons one acre or larger were included and displayed on <br />the map. Wetland areas with these characteristics that were in close <br />proximity to existing infrastructure (homes, businesses and roads) were <br />removed from consideration. <br /> <br />10.5.3 Lake water quality assessment <br /> <br />Each lake located within the Rice Creek Watershed District was evaluated to <br />determine its potential for water quality impairment due to excessive nutrients <br />(Table 10.1). The lakes fell into one of three categories: <br />o No data: Not enough water quality data available for evaluation. <br />o Listed on 303(d) list of impaired waters: Lake is currently on the impaired <br />waters list (TMDL list) for excessive nutrients. (Lakes that are on the <br />impaired waters list only due to high levels of mercury, and not due to <br />excessive nutrients, are not included in this category.) <br />o Potential to become impaired: Available water quality data suggest that <br />the lake is currently not impaired. Due to development pressure or to <br />borderline water quality conditions, this lake has the potential to become <br />impaired in the near future. <br />Table 10.1 - Lake Water Quality (Rice Creek Watershed District) <br />Lake No Data <br />Listed on the <br />303(d) list of <br />impaired waters <br />Potential to <br />become <br />impaired <br />Johanna*X <br />Josephine*X <br />Karth X <br />Little Johanna X <br />Marsden X <br />Round X <br />Sunfish X <br />Valentine X <br />*Listed on the 303(d) list of impaired waters for mercury <br />The 303(d) list is part of the federal Clean Water Act, which requires states to <br />adopt water quality standards to protect waters from pollution. <br /> <br /> Draft 03/07/2018