Fisheries & Aquatic Habitat Restoration Feasibility Study Royal River
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FISHERIES & AQUATIC HABITAT RESTORATION FEASIBILITY STUDY ROYAL RIVER RESTORATION PROJECT YARMOUTH, MAINE Prepared For: Town of Yarmouth Yarmouth Town Hall 200 Maine Street Yarmouth, Maine 04096 Prepared By: Stantec Consulting Services Inc. 30 Park Drive Topsham, Maine 04086 November 2010 Project Partners: This document shall be considered a draft version provided for the convenience of the user and shall not be considered an instrument of service of Stantec Consulting Services Inc. unless it bears the professional engineers stamp and original signature. This document may not be altered by others or used for projects or purposes other than the project for which it was prepared without the express written consent of Stantec Consulting Services Inc. Portions of this document were prepared by others. Stantec Consulting Services Inc. has not verified the accuracy and/or completeness of this information and shall not be responsible for any errors or omissions that may be incorporated herein as a result. The copyrights to all designs and drawings are the property of Stantec Consulting Services Inc. Reproduction or use for any purpose other than that authorized by Stantec Consulting Services Inc. is forbidden. Designs and drawings contained herein shall not be used for construction. Fisheries & Aquatic Habitat Restoration Feasibility Study Page i Royal River Restoration Project, Yarmouth, Maine TABLE OF CONTENTS 1.0 Introduction ........................................................................................................................................ 1 1.1 Project Background ....................................................................................................................... 1 1.2 The River ....................................................................................................................................... 1 1.2.1 Royal River Corridor .................................................................................................................. 3 1.2.2 Previous Fisheries Restoration Efforts ...................................................................................... 5 1.3 Feasibility Study Goals .................................................................................................................. 8 1.3.1 Restoration of Fisheries ............................................................................................................ 8 1.3.2 Enhanced Ecological Function .................................................................................................. 9 1.4 Methods of Feasibility Study ......................................................................................................... 9 1.4.1 Alternative Development and Evaluation .................................................................................. 9 2.0 Project Alternatives ......................................................................................................................... 10 2.1 General Discussion of No Action Alternative .............................................................................. 10 2.2 Action Area 1 – Bridge Street Dam ............................................................................................. 10 2.2.1 Modification of the Bridge Street Dam Fishpass ..................................................................... 10 2.2.2 Removal of the Bridge Street Dam ......................................................................................... 10 2.3 Action Area 2 – Middle Falls ....................................................................................................... 11 2.3.1 Modification of the Middle Falls ............................................................................................... 11 2.4 Action Area 3 – East Elm Street Dam ......................................................................................... 11 2.4.1 Modification of the East Elm Street Dam Fishpass ................................................................. 11 2.4.2 Removal of the East Elm Street Dam ..................................................................................... 11 3.0 Affected Environment – Existing conditions .................................................................................... 12 3.1 Ecological Resources .................................................................................................................. 12 3.1.1 Fisheries .................................................................................................................................. 12 3.1.2 Wetlands ................................................................................................................................. 13 3.1.3 Wildlife ..................................................................................................................................... 15 3.1.4 Listed Species ......................................................................................................................... 15 3.2 Existing Upstream Fish Passage Facilities ................................................................................. 15 3.3 Hydrology, Hydraulics, and Physical Processes ......................................................................... 16 3.3.1 General Hydrology of the Watershed ...................................................................................... 16 3.3.2 Hydrology and Hydraulics in the Vicinity of the Dams ............................................................ 18 3.3.3 Flooding ................................................................................................................................... 20 3.3.4 Morphology .............................................................................................................................. 20 3.3.5 Sediment Quality Analysis ...................................................................................................... 25 3.3.6 Ice Jams .................................................................................................................................. 31 3.4 Groundwater Resources ............................................................................................................. 31 3.5 Existing Infrastructure ................................................................................................................. 33 3.6 Recreational Factors ................................................................................................................... 34 3.6.1 Boating .................................................................................................................................... 34 3.6.2 Fishing ..................................................................................................................................... 34 3.6.3 Hunting .................................................................................................................................... 34 3.6.4 Trapping .................................................................................................................................. 34 3.6.5 Other Recreational Uses ......................................................................................................... 34 3.7 Historical and Archaeological Resources ................................................................................... 35 3.8 Penobscot Indian Nation, Passamaquoddy Tribe, and Houlton Band of Maliseet ..................... 40 3.9 Potential Future Uses of the Dams ............................................................................................. 40 3.9.1 Bridge Street Dam ................................................................................................................... 40 3.9.2 East Elm Street Dam ............................................................................................................... 40 4.0 Impact Assessment ......................................................................................................................... 41 4.1 Project Action Area: Bridge Street Dam ...................................................................................... 41 4.1.1 No Action ................................................................................................................................. 41 4.1.2 Modified Fish Passage Facilities ............................................................................................. 42 Fisheries & Aquatic Habitat Restoration Feasibility Study Page ii Royal River Restoration Project, Yarmouth, Maine 4.1.3 Dam Removal .......................................................................................................................... 43 4.2 Project Action Area: Middle Falls ................................................................................................ 45 4.2.1 No Action ................................................................................................................................. 45 4.2.2 Modification of the Middle Falls ............................................................................................... 46 4.3 Project Action Area: East Elm Street Dam .................................................................................. 47 4.3.1 No Action ................................................................................................................................. 47 4.3.2 Modified Fish Passage Facilities ............................................................................................