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Town of Ridgefield seeks Corps permit to stabilize Third Lane Stream, reduce streambank erosion

Published April 29, 2014

CONCORD, Mass. – The town of Ridgefield is seeking a permit from the U.S. Army Corps of Engineers, New England District to conduct work in waters of the United States in conjunction with stabilizing Third Lane Stream to reduce streambank erosion in Ridgefield, Conn.


The town of Ridgefield is proposing to stabilize a segment of Third Lane Stream in order to reduce streambank erosion and prevent further sedimentation into Lake Mamanasco. The work is proposed in Third Lane Stream located opposite of 228 Mamanasco Road in Ridgefield. Proposed work includes regrading approximately 210 feet of the streambed and some minor regrading of the adjacent streambanks.


Filter fabric will be placed across the channel bottom and topped with crushed stone in preparation for a 1-foot thick gabion mattress. The gabion mattress will be filled with stones 4 inches or greater in diameter. Following the placement of the channel bottom mattress, filter fabric will be extended up the streambanks and gabion baskets will be wired into place. An additional gabion layer will be added, where necessary, to meet the adjacent grade. Fill material will then be placed between the gabion baskets and the streambank in order to fill the voids. Approximately 2,700 square feet of wetland/watercourse will be impacted.


Boulders also will be placed within the new, gabion-lined channel and along the downstream edge of the large flat pooling area. The purpose of the boulders is to reduce the flow and stream velocity. The applicant will use a silt fence during construction of the gabion walls in order to minimize impacts to the surrounding area. The applicant also has proposed to plant native vegetation along the tops of the gabion walls to compensate for the loss of wetland/watercourse.


The application for the federal permit was filed with the Corps of Engineers in compliance with Section 404 of the Clean Water Act, which regulates the discharge or fill of material in U. S. waters, including wetlands. The public notice, with more specifics on the proposed work, can be viewed on the Corps website at:  http://www.nae.usace.army.mil/Missions/Regulatory/PublicNotices.aspx.


Public comments on this proposed work by the town of Ridgefield (file # NAE-2013-1658) should be forwarded no later than May 29, 2014 to the U.S. Army Corps of Engineers, New England District, Regulatory Division (ATTN: Lindsay Flieger), 696 Virginia Road, Concord, MA 01742-2751. Additional information is available from Permit Project Manager Lindsay Flieger at 978-318-8656 or toll free 800-343-4789 or 800-362-4367 (if calling from within Massachusetts) or by email to: lindsay.flieger@usace.army.mil.

Tim Dugan

Release no. 2014-052