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<br />The blockage appears to mainly affect the timing of peak elevations in Reshanau Lake and <br />extends the duration of higher than normal water surface elevations. Smaller, more frequent, <br />events show a more dramatic difference in lake elevations with the blockage. <br /> <br />The flows in the culvert are impacted by the culvert blockage, limiting the way water moves <br />between Rice and Reshanau Lakes. Water from Rice Lake is unable to backflow into Reshanau <br />Lake for small events. This also affects Reshanau Lake’s ability to return to “normal” lake <br />levels following a storm event. Only during large flood events, when the roadway overtops, does <br />the culvert begin to backflow. <br /> <br />Reconstructing the culvert per the original culvert design verses a blocked condition will have <br />some minor impacts on overall flood levels in Reshanau Lake by allowing flows to more freely <br />equalize between Rice and Reshanau Lakes. Residents may notice more frequent lake level <br />fluctuations in small events as the water is able to return to normal levels more readily. <br /> <br />It is not advised to design the replacement culvert to mimic the blocked conditions due to <br />Reshanau Lake’s role in absorbing flood flows from Rice Lake. Adding a backflow preventer <br />device may have unintended consequences on downstream flood elevations and may adversely <br />affect Reshanau Lake residents by increasing flood levels. <br /> <br />Katy Thompson from WSB Engineering will be in attendance to present the model data. <br /> <br />Temporary By-Pass Road through Golf Course & West Shadow Lake Drive Cul du Sac <br /> <br />Preliminary layouts for the temporary by-pass road through Golf Course and the West Shadow <br />Lake Drive cul du sac have been designed and reviewed by Anoka County, enclosed. The trail <br />through the golf course, along Sandpiper Drive & West Shadow Lake Drive, and to the east is an <br />Anoka County Regional trail. A cul du sac is being constructed at the end of West Shadow Lake <br />Drive and as part of this improvement Anoka County would like to add parking stalls along the <br />south side. <br /> <br />The temporary by-pass road through Golf Course: <br /> <br />a. The removal of spruces will be minimized. <br />b. A 15’ wide paved temporary access will be constructed and function as a single lane with <br />a pull off mid-way for cars that meet. <br />c. The temporary access would remain at the end of the project, saving project costs by not <br />having to reconstruct the trail. <br /> <br />Requested Council Direction <br /> <br />None at this time, project update. <br /> <br />Attachments <br /> <br />1. Temporary by-pass road and West Shadow Lake Drive cul du sac Layouts