Glenwood Dairyland Basin Stormwater Mitigation Project
Clean water funds are being utilized to address eroding ravines and untreated runoff entering Lake Minnwaska. The ravines originate from a 24 culvert that runs under Highway 55. The worst of the erosion in this area has been in the last ten years and the ravines now measure up to 20' deep and 30' wide and have uprooted trees, rocks and other debris. Installation of riparian cover and check dams in the two ravines will decrease further erosion and reduce suspended sediment during high flow events entering Lake Minnewaska. Several projects are designed to eliminate the direct discharge of untreated runoff flowing from impervious (hard) surfaces to the lake. All promote the water being absorbed into the ground before reaching the water table that corresponds to the lake level. A 50'X 490' parking lot at City Beach on the shoreline of Lake Minnewaska will be removed to decrease the direct flow of stormwater entering Lake Minnewaska. The new parking lot will be installed so that stormwater flows into a holding area located between County Road 104 and the parking lot. To further treat stormwater, three rain gardens with plants native to Pope County will be installed in the vegetated area where the parking lot was located. This project will keep an estimated 400,000 gallons of stormwater filled with debris and various pollutants from directly entering Lake Minnewaska each year.
(c) $3,000,000 the first year and $3,000,000 the second year are for nonpoint source pollution reduction and restoration grants to watershed districts, watershed management organizations, counties, and soil and water conservation districts for grants in addition to grants available under paragraphs (a) and (b) to keep water on the land and to protect, enhance, and restore water quality in lakes, rivers, and streams, and to protect groundwater and drinking water. The projects must be of long-lasting public benefit, include a local match, and be consistent with TMDL implementation plans or local water management plans. Up to five percent may be used for administering the grants (2010 - Clean Water Assistance)
This project will keep an estimated 400,000 gallons of stormwater filled with debris and various pollutants from entering Lake Minnewaska annually.
A water control structure, (1), erosion control practice (1), and shoreline stabilization practice (1), were installed, yielding an estimated sediment loss reduction (TSS) of 680.31 tons/yr and 579.15 lbs/yr of phosphorus.