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Title: Environmental Assessment : Dredged Material Placement in High Risk Erosion Areas, Lake Huron, St. Clair County, Michigan
Authors: United States. Army. Corps of Engineers. Detroit District.
Keywords: Port Huron (Mich.)
Saint Clair River (Mich. and Ont.)
Dredging spoil
Environmental management
Environmental protection
Publisher: United States. Army. Corps of Engineers. Detroit District.
Abstract: dredging of the federally authorized navigation channel in the St. Clair River, Michigan. The St. Clair River is located in eastern Michigan, connecting Lake Huron to Lake St. Clair over a distance of about 39 river miles. The river forms part of the international border between the United States and Canada. Maintenance dredging of the St. Clair River is vital to ensuring that approximately 57 million tons of commerce (average from 2008-2012) can pass through the channel each year. Currently, dredged material from the Upper St. Clair River is placed in the open water of Lake Huron approximately 5 miles from the river entrance. Because of the sandy nature of the dredged material and concerns of ongoing beach erosion, USACE is proposing that a beneficial re-use be made of the dredged material. The USACE is proposing that the dredged sediment be placed in the shoreline nourishment zone of up to four of the state-designated high risk erosion areas (HREAs) located in Lake Huron; just offshore of the City of Port Huron and Fort Gratiot Township. Up to 50,000 cubic yards (CYD) of shoal material would be removed from the channel by mechanical dredge during the next planned dredging event. The dredged material consists of unpolluted sediment (93% sand) and would either be mechanically or hydraulically placed within the HREAs between the six and a half (6.5) and the twelve (12) foot underwater depth contour. Water depth immediately after placement would be a minimum of four feet. Placement within the HREAs would be expected to occur again during future dredging events.
Description: Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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