Please use this identifier to cite or link to this item:
Title: Maintenance Dredged Combined-Projects Biological Assessment : Fiscal Year 2017 through 2042 Maintenance Dredging of Selected Federal Authorized Navigation Channels, with Disposal of Dredged Material at Designated Disposal Sites
Authors: United States. Army. Corps of Engineers. Seattle District
Keywords: Puget Sound (Wash.)
Swinomish Channel (Wash.)
Keystone Harbor (Wash.)
Upper Duwamish Waterway (Wash.)
Grays Harbor (Wash.)
Westhaven Cove (Wash.)
Quillayute River (Wash.)
Port Townsend Harbor (Wash.)
Dredging spoil
Environmental management
Environmental protection
Publisher: United States. Army. Corps of Engineers. Seattle District.
Abstract: This document is a combined‐projects biological assessment that evaluates the effects of the U.S. Army Corps of Engineers Seattle District’s maintenance dredging program and beneficial‐use disposal of dredged material from USACE maintenance dredging and disposal activities on Endangered Species Act listed species and their designated and proposed critical habitat. This BA will initiate Section 7 consultation with the National Marine Fisheries Service and the U.S. Fish and Wildlife Service (hereafter referred to as “the Services”). The maintenance dredging program encompasses periodic removal of accumulated material from Federal authorized navigation channels. Disposal encompasses a variety of alternatives for placement of dredged material, including in authorized multi‐user open‐water disposal sites, such as Dredged Material Management Program managed sites. These sites include both non‐dispersive (where dredged material remains in the disposal site) and dispersive (material is dispersed via currents). Disposal of dredged material derived from Federal navigation channel maintenance in multi‐user aquatic sites is the subject of an independent BA and consultation, previously concluded. This BA describes the dredging techniques, maintenance dredging sites, placement at beneficial use disposal sites, baseline conditions, effects of maintenance dredging of navigation channels, effects of material placement at beneficial use disposal sites, and effects to ESA‐listed species and designated or proposed critical habitat in authorized navigation channels and disposal sites. In addition, the BA evaluates effects of maintenance dredging and disposal on essential fish habitat (EFH) under Public Law 104‐267 (the Sustainable Fisheries Act of 1996), which amended the Magnuson‐Stevens Fisheries Conservation and Management and Act of 1976. The majority of maintenance dredging in Western Washington is conducted with mechanical (clamshell) dredges. Other techniques are used under narrow circumstances; examples include the outer Grays Harbor reaches (hopper dredge) and the placement of material for beneficial use (hydraulic cutterhead). Taking into consideration the effects of maintenance dredging, disposal, baseline conditions, and interrelated, interdependent, and cumulative effects, the USACE’s effect determination for the maintenance dredging program and dredged material disposal for Federal navigation projects is “may affect, not likely to adversely affect” ESA‐listed species and their designated or proposed critical habitat. There are potential adverse effects to EFH, but proposed conservation measures will minimize and mitigate those adverse effects. The USACE intends for this consultation to cover a term of 25 years of Federal action.
Description: Biological Assessment
Rights: Approved for Public Release; Distribution is Unlimited
Appears in Collections:Environmental Documents

Files in This Item:
File Description SizeFormat 
Maintenance Dredging Combined-Projects Biological Assessment EA 2016.pdf16.38 MBAdobe PDFThumbnail