Lower Gales Creek
Habitat Enhancement Plan
The purpose of this report is to outline a 5-year
anadromous fish habitat enhancement plan
for a four mile reach of lower Gales Creek, a tributary
of the Tualatin River (see Figure 1-1). The Lower Gales Creek Habitat
Enhancement Plan (Lower Gales Plan) builds upon a base of work conducted through a watershed assessment process, habitat
studies, and work performed by the Tualatin
River Watershed Council (Council)
stream and riparian restoration committee.
The Lower Gales Plan was developed in
response to a U.S.
Bureau of Reclamation (BOR) request for
proposal to evaluate and prioritize factors
limiting salmonid production, particularly winter steelhead
trout (Oncorhynchus mykiss), and develop
a 5-year habitat restoration
plan for one priority area within the
Tualatin River Watershed. The BOR is providing
funds to mitigate for loss
of salmonid habitat caused by the construction
of Scoggins Dam and the creation of Henry
Hagg Lake.
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Section 1: Introduction
1-1 Purpose
1-2 History of Fish Mitigation in the Tualatin
River Basin
1-3 Gales Creek: an Overview
1-4 Salmonid Fish Distribution
in Gales Creek
Section 2: Priority Stream Selection
2-1 Selection Process
2-2 Existing Conditions in the Priority Area
Section 3: Functional Reach Indentification
3-1 Process
3-2 Enhancement Components
3-3 Limits of Plan
Aerial Photos of Reaches
GL
01, GL
02-04, GL
05-07, GL 08-10
CL
01, RL 01-02
Section 4: Recommendations
4-1 Connecting with the Community
4-3 Recommendations by Reach
4-4 High Priority Projects
Section 5: Project Considerations
5-1 Five-Year Plan
5-2 Conceptual Monitoring Plan
5-2 Opportunities for Long-Term
Stewardship
Sources and References
Appendix List
Appendix A: Watershed Council Riparian Committee Definitions and Assumptions
for Criteria
Appendix B: Criteria For Rating Tualatin Basin Stream Reaches
Appendix C: Matrix of Priority Stream Reaches with Additional Run
Strength Scoring
Appendix D: Gales Creek Watershed Landowner Survey Results
Appendix E: Channel Condition Assessment Criteria
Appendix F: Summary of Degree of Impairment Scoring and Supporting
Tables
Environmental Baseline
Summary
of Degree of Impairment Ranking
Scores
Appendix G: Student Watershed Research Project Data for Gales Creek
at Isaac Walton/County Property Site
Macroinvertebrate Data
Nutrient Chemistry
Physical Chemistry
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