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4.2.2 Mud Lake Water Management Plan 4.2.2.1 Location and General Description Mud Lake is a 40-acre lake (DNR #82-102P) located in Subwatershed LL4, in the City of Oakdale, between 45th and 50th Streets North and east of Granada Avenue North. The tributary watershed is 271 acres, and is comprised of Subwatersheds LL1 through LL4. All of the tributary area is located within the City of Oakdale. Mud Lake is surrounded by a strip of parkland but is in an otherwise rapidly developing watershed. The average depth of the lake is estimated to be 4 feet. A few pockets within the lake are approximately 15 feet in depth. Throughout the summer months, a profuse growth of water lilies covers the lake. A walking trail follows 3/4 of the shoreline, and a dock extends out into the lake. 4.2.2.2 Drainage Patterns and Stormwater Issues The Oakdale Surface Water Management Plan's (Oakdale plan) wetland management classificationfor Mud Lake is protected wetland. The Oakdale plan lists the 100-year flood elevation of Mud Lake as 995.6. The Oakdale plan also shows a proposed modification to the Mud Lake outlet to achieve an outflow rate consistent with the plan. The Oakdale plan rated this modification a top priority to be completed in 1991. 4.2.2.3 VBWD Water Quantity Management Goals Stormwater management issues regarding Mud Lake are addressed in the Oakdale plan and are the responsibility of the City of Oakdale. VBWD is aware of the proposed Mud Lake outlet modification, but is not aware of any modifications at this time. 4.2.2.4 Water Quality, DNR Data, and Public Use No water quality information for Mud Lake has been collected by VBWD or the City of Oakdale, and no Lakeshore residues there arekmg part iri the MPCA's Citizen Lake Monitoring Program. Because of its size, location, and its profuse growths of water lilies throughout the summer, recreational use of the lake is limited to passive uses. Located in the center of a nature preserve, the lake is used primarily for aesthetic viewing by individuals visiting the nature preserve. Based on its existing and desired recreational uses, Mud Lake is classified as a Category V water body (wetland) in Section 3.2. More information about water quality categories is available in Section 3.2. 4.2.2.5 VBWD Water Quality Management Goals Water quality standards will be established by VBWD and implementation of the standards will be the responsibility of the City of Oakdale. Since no water quality sampling has been conducted on Mud Lake, the existing or potential impact of development upon the lake's water quality is not known. It is anticipated that the water quality of Mud Lake will further decline as development progresses. Both the City of Oakdale and VBWD are concerned about the water quality of Mud Lake and the impact it may have on the water quality of downstream water bodies. To minimize these adverse impacts, developers will be required to use best management practices in the lake's tributary watershed. VBWD will consider instituting a water quality monitoring program for Mud Lake. The water quality data will assist VBWD in determining the impact of development on Mud Lake and the impact of Mud Lake water quality on downstream water bodies. 23\82\045\SEC4.RPT\KMH 6 DRAFT: June 23, 1994 l