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Title: Blue Hill Harbor, Blue Hill, Maine : Section 107 Navigation Improvement Project, Detailed Project Report and Environmental Assessment
Authors: United States. Army. Corps of Engineers. New England District
Keywords: Blue Hill (Me.)--Harbors
Inland navigation
Channels (Hydraulic engineering)
Environmental management
Environmental protection
Publisher: United States. Army. Corps of Engineers. New England District.
Abstract: The U.S. Army Corps of Engineers (USACE), in partnership with the town of Blue Hill, Maine (Town) conducted this feasibility study to examine establishing a Federal Navigation Project (FNP) in Blue Hill Harbor, Blue Hill, Maine. The study was conducted to determine if Federal participation in channel and related navigation improvements is warranted. The proposed channel improvements would increase the harbor’s ability to accommodate safe and efficient commercial fishing vessel operations from the town landing. Establishing a FNP would also eliminate groundings of fishing boats transiting to and from the landing at lower tides. There is no existing Federal Navigation Project for Blue Hill Harbor. A prior study in 1972 recommended adoption of a project consisting of a channel to the town landing with a turning basin at its head. Lack of local financing prevented implementation of a project at that time. An initial appraisal and Federal Interest Determination (FID) was completed August 13, 2013 and recommended proceeding with this cost-shared feasibility study. A Feasibility Cost-Sharing Agreement was executed between the town of Blue Hill and the USACE on June 29, 2015. This study developed and analyzed various alternatives for navigation channel improvements and the benefits that each alternative provides. The Recommended Plan, as shown in Figure ES-1, would establish a channel -6 feet deep at mean lower low water by 80 feet wide, extending about 5,400 feet from deep water off Parker Point up-harbor to the Blue Hill town landing with a one-half-acre turning basin at its head. Only the upper 2,600 feet of the channel would require dredging. The dredging would be by mechanical bucket dredge and scow that will be able to operate in shallow draft areas in the channel. The project would involve the dredging of about 71,500 cubic yards (CY) of mixed silty and sandy material from the channel and turning basin. Testing has determined that most of this material is suitable for open-water placement at the previously used Eastern Passage Disposal Site. Dredged material from the upper channel reaches includes about 10,600 cubic yards from the upper two feet of material that has been determined unsuitable for unconfined open water placement. To dispose of the unsuitable portion of the dredged material a confined aquatic disposal cell (CAD), about 1.8 acres in size, would be constructed in the harbor north of the channel. Forming the CAD cell would require dredging an estimated 19,500 cubic yards of material. Of the remaining 60,900 CY of the suitable dredged material from the lower channel reaches, about 8,800 CY, would be used to cap the CAD cell after it is filled. All remaining suitable material, including 52,100 CY from the channel and the 19,500 CY dredged to create the CAD cell (a total of 71,600 CY) would be placed at the previously used Eastern Passage Disposal Site. Various other channel depths and upland disposal options for the unsuitable material were also evaluated. The Recommended Plan, with a 6-foot channel and turning basin and disposal of unsuitable material in a CAD cell would result in the greatest economic net benefits derived for providing the commercial fishermen with reliable and improved access to the facilities in Blue Hill Harbor.
Description: Detailed Project Report and Environmental Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

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