BEAR CREEK WATERSHED ASSESSMENT PLACER COUNTY, CALIFORNIA Prepared for: Prepared by: PO Box 8568 Truckee, California 96162 February 16, 2018 And Dr. Susan Lindstrom, PhD BEAR CREEK WATERSHED ASSESSMENT – PLACER COUNTY – CALIFORNIA February 16, 2018 A REPORT PREPARED FOR: Truckee River Watershed Council PO Box 8568 Truckee, California 96161 (530) 550-8760 www.truckeeriverwc.org by Brian Hastings Balance Hydrologics Geomorphologist Matt Wacker HT Harvey and Associates Restoration Ecologist Reviewed by: David Shaw Balance Hydrologics Principal Hydrologist © 2018 Balance Hydrologics, Inc. Project Assignment: 217121 800 Bancroft Way, Suite 101 ~ Berkeley, California 94710-2251 ~ (510) 704-1000 ~
[email protected] Balance Hydrologics, Inc. i BEAR CREEK WATERSHED ASSESSMENT – PLACER COUNTY – CALIFORNIA < This page intentionally left blank > ii Balance Hydrologics, Inc. BEAR CREEK WATERSHED ASSESSMENT – PLACER COUNTY – CALIFORNIA TABLE OF CONTENTS 1 INTRODUCTION 1 1.1 Project Goals and Objectives 1 1.2 Structure of This Report 4 1.3 Acknowledgments 4 1.4 Work Conducted 5 2 BACKGROUND 6 2.1 Truckee River Total Maximum Daily Load (TMDL) 6 2.2 Water Resource Regulations Specific to Bear Creek 7 3 WATERSHED SETTING 9 3.1 Watershed Geology 13 3.1.1 Bedrock Geology and Structure 17 3.1.2 Glaciation 18 3.2 Hydrologic Soil Groups 19 3.3 Hydrology and Climate 24 3.3.1 Hydrology 24 3.3.2 Climate 24 3.3.3 Climate Variability: Wet and Dry Periods 24 3.3.4 Climate Change 33 3.4 Bear Creek Water Quality 33 3.4.1 Review of Available Water Quality Data 33 3.5 Sediment Transport 39 3.6 Biological Resources 40 3.6.1 Land Cover and Vegetation Communities 40 3.6.2 Invasive Species 53 3.6.3 Wildfire 53 3.6.4 General Wildlife 57 3.6.5 Special-Status Species 59 3.7 Disturbance History 74 3.7.1 Livestock Grazing 74 3.7.2 Logging 74 3.7.3 Roads and Ski Area Development 76 4 WATERSHED CONDITION 81 4.1 Stream, Riparian, and Meadow Corridor Assessment 81 Balance Hydrologics, Inc.