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https://hdl.handle.net/11681/48351| Title: | Final Environmental Assessment and Clean Water Act, Section 404 Public Interest Review : Quillayute River Federal Navigation Channel Maintenance Dredging and Placement 2017-2024, Clallam County, Washington |
| Authors: | United States. Army. Corps of Engineers. Seattle District |
| Keywords: | Quillayute River (Wash.) Dredging Dredging spoil Dredged material Environmental management Environmental protection |
| Publisher: | United States. Army. Corps of Engineers. Seattle District. |
| Abstract: | In accordance with the National Environmental Policy Act (NEPA), this Environmental Assessment (EA) evaluates the impacts of the proposed maintenance of the Federal navigation channel from the mouth of the Quillayute River to the U.S. Coast Guard station, and the small boat basin at La Push, Washington. La Push is located on the northwest coast of the Olympic Peninsula, in Clallam County, Washington. Shoaling of the channel requires maintenance dredging approximately every two years to facilitate safe navigation. The document provides analysis of two action alternatives compared to taking no action. The navigation channel would be maintained between stations 0+00 and 35+00 to the authorized depth of -10 feet mean lower low water (MLLW) plus two feet of allowable overdepth. Specifically, the proposed dredging activities include a 3,500-foot long section of the authorized navigation channel, which varies in width from 100 to 275 feet, and the 335,000-square-foot boat basin. The total quantity estimated to be dredged and locally placed is up to 100,000 cubic yards of sediment per episode. Material temporarily placed at Site A would be pushed onto First Beach to reduce the risk of a breach in the South Jetty. Material dredged from the inner channel would be placed on the ocean side of Quillayute Spit in Site B. The duration of the work would be approximately 60 days if the dredge is able to work 24 hours per day, but may extend to 120 days if foul weather causes delays. Disruptions may occur due to weather or for avoiding disruption of Tribal fisheries. The dredging interval is approximately every two years depending on shoaling as indicated by physical surveys and depending on availability of funds, among other factors. Dredging events are planned to occur over a 7-year period beginning 2017 and ending in early 2024 to include the full duration of the fish work window that closes 28 February each year. The difference between the two action alternatives is regarding whether a staggered start date of 1 September and 1 October, depending on the placement site, should continue to be observed, or if it is preferable to begin the entire course of dredging and placement on 1 September. |
| Description: | Environmental Assessment, Public Interest Review, and Finding of No Significant Impact |
| Rights: | Approved for Public Release; Distribution is Unlimited |
| URI: | https://hdl.handle.net/11681/48351 |
| Appears in Collections: | Environmental Documents |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| 2017-2024 Maintenance Dredging Quillayute River EA and FONSI_2017.pdf | 2.23 MB | Adobe PDF |  View/Open |