Resolution 1411 - Laserfiche WebLink

Home Browse Search

.. . , , . T��so�, # �lI � � ��ItgIT � Novr.rlB��, 1981 � ., 10. DREDGING OR OTHER ALTERATION OF LAKE BEDS OR WETLANDS WILL BE �' DISCOURAGED BECAUSE OF ADVERSE SHORT-TERA1 AND LONG-TER1�1 EFFECTS ON WATER QUALITY. Dredging releases large amounts of otherwise trapped nutrients and silt, and removes .the filtration capacity of lost vegetation. Open scoop dredging suspends as much or more material than is actually removed. Nearby waters are unuseable for days. And when. the nutrient-rich solids do settle they fertilize the lake bed causing water quality deterioration and greatly increased weed and algae growth that adversely affects neighboring properties for extended periods of time . Dredging scars the lake bed seal not only releasinc, the nutrients trapped within the disturbed material , but also opening up the sponge of long-bwried nutrients which are then sipiloned off � into the open water. Because these adverse affects on water � quality are suffered for long periods of time , dredging of lake � beds or wetlands will not be permitted unless it is clearly demonstrated that the dredging proposal is the minimal impact . solution �to a problem of general public concern. A. Open-water, lake bed dredging will be permitted only in limited circumstances , only when absolutely , necessary to maintain existing natural riparian access permanently lost by something beyond the control of the landowner, and then only when no otYier alternatives are available such as use of a longer dock, use of a • �joint dock, or use of another area of the shoreline . In most situations, granting of a dock length or setback variance will be prefezrable to dredging. Dredging of new channels or inlets will not be approved to provide navigable riparian access where none existed naturally. � Existing dredged channels � are expected to silt-in �I naturally. Redredging is as environmentally disruptive � as new dredging. Maintenance dredging will be subject to the same standards of review as new dredging ,, and wi1•1 not usually be approved unless a large number of users are affected, such as in the public channels . between b�ys. . Periodic low water conditions .or an owner' s desire for deeper draft watercraft are not sufficient reasons for disrupting sensitive lake beds . . . B. Dredging or filling of up2and wetlands or shoreline marshes destroys wetlands vegetation, removing nutrient assimflative capacity and incressing the velocity of storm water discha=ge to the lakes. Dredging , filling or other alteration of desiqnated wetlands wfll be prohibited unless nn overriaing hardship is demonstrated to justify a variance from this policy. The crestion of wildlife ponda or stormwater retention ponds is ' encouraged, but only if the area to be altered is not withfn a designated aetland. All ail8life ponds shall • be constructed to DNR standards, including upland disposal and erosion control of spoils . CMP 3-21