S AN F RANCISQUITO WATERSHED C OUNCIL Adult Steelhead Passage in the Bear Creek Watershed Jerry J. Smith, Dept. of Biological Sciences, and Deborah R. Harden, Dept. of Geology, San Jose State University, San Jose, CA 95192 San Francisquito Watershed Council, c/o Acterra 3921 East Bayshore Road, Palo Alto CA 94303-4303 phone: 650.962.9876 fax: 650.962.8234 e-mail:
[email protected] Pat Showalter, Watershed Council Director July 2001 This study was supported by a grant from the California Department of Fish & Game. Table of Contents ii About Us iii San Francisquito Creek Watershed Locator Map iv-ix Executive Summary 1-3 Background: Steelhead Ecology 4-7 Barriers to Steelhead Passage 8-10 Quality of Available Habitat Within the Watershed 11 Priorities for Barrier Modification or Removal 12 Table 1. Types, severity and recommended actions for potential barriers to adult steelhead migration in the Bear Creek watershed 13 Table 2. Potential benefit, effort/cost required, and priority for modification/removal of barriers within the Bear Creek watershed 14-50 Steelhead Migration Barriers in the Bear Creek Watershed 51 Appendix A. Effects of the San Andreas fault system on habitat 52 Figure A-1. Location map of Steelhead Migration barriers 53 Figure A-2. Geological map of the Bear Creek watershed 54 Figure A-3. Longitudinal profiles of West Union, Bear Gulch, and Bear Creeks 54 Figure A-4. A portion of the Woodside and Palo Alto topographic maps 55-64 Appendix B. Barriers outside of Bear Creek Subbasin ADULT STEELHEAD PASSAGE IN THE BEAR CREEK WATERSHED i About Us THE SAN FRANCISQUITO CREEK WATERSHED COUNCIL IS A COMMUNITY-BASED VOLUNTEER ORGANIZATION THAT WAS FORMED IN 1993 AND IS DEDICATED TO COORDINATED RESOURCE MANAGEMENT AND PLANNING (A CRMP PROCESS) AMONG LANDOWNERS, AGENCIES, AND NON-PROFITS.