2019-2021 Biennium Studies

• Local Actions Program Advisory Group Materials

2017-2019 Biennium Studies

• Restorative Flood Protection Feasibility Assessment (Natural Systems Design, Jan 2020)
  • Appendix 1: Existing Conditions Summary (part 1)
  • Appendix 1: Existing Conditions Summary (part 2)
  • Appendix 2: Cost Assessment for Property and Transportation Impacts
  • Appendix 3: Hydraulic Modeling Part 1 Report
  • Appendix 3: Mapbook A – 100-year Flood Maps
  • Appendix 3: Mapbook B – Highly Engineered RFP 100-year Flood Maps
  • Appendix 3: Mapbook C – Climate Change 100-year Flood Maps
  • Appendix 3: Mapbook D – Landcover – Existing
  • Appendix 3: Mapbook E – Landcover – RFP
  • Appendix 3: Mapbook F – Landcover – HE – RFP
  • Appendix 4: Analysis of Agriculture
  • Appendix 5: Landowner Interview Project Summary
  • Appendix 6: Plant Communities
• Chehalis Basin Strategy Phase 3 Landslide Evaluation (Shannon & Wilson, May 2019)
• Chehalis River Basin Climate Change Flows and Flooding Results (Anchor QEA, May 2019)
• Chehalis-Centralia Airport Levee Wetland Delineation Report (Anchor QEA, May 2019)
• Rock Quarry Characterization Potential RCC Aggregate Sources for  Chehalis Dam (Shannon & Wilson, March 2019)
• Phase 3 Chehalis Dam Geotechnical Data Report (Shannon & Wilson, March 2019)
• Chehalis River Existing Conditions RiverFlow2D Model Development and Calibration (Watershed Science and Engineering, February 2019)
• Chehalis River Basin Hydrologic Modeling (Watershed Science and Engineering, February 2019)
• Chehalis River Smolt Production Report 2018 (Washington Department of Fish and Wildlife, January 2019)
• Wetland, Water, and Ordinary High Water Mark Delineation Report (Anchor QEA, December 2018)
• Chehalis River Off-Channel Habitat Hydrologic Monitoring Project (Anchor QEA, October 2018)
  • Appendices A-C
  • Appendices D-F

• Flood Retention Facility – Expandable (FRE) Supplemental Design Report (September 2018)
• Fish Passage: Collect, Handle, Transfer, and Release (CHTR) Preliminary Design Report (February 2018)

2015-2017 Programmatic EIS Supporting Documentation

• Geomorphology, Sediment Transport, and Large Woody Debris Report (June 2017)
• Combined Dam and Fish Passage Design Conceptual Report (July 2017)
• Analysis of Salmonid Habitat Potential to Support the Chehalis Basin Programmatic Environmental Impact Statement (July 2017)
• Washington Department of Fish and Wildlife Studies
  • 2015 Upper Chehalis Instream Fish Study (September 2016)
  • 2015 Chehalis ASRP Off-Channel Habitat Summary Based on Egg Mass Surveys: 2nd Progress Report (November 2015)
  • 2015 Chehalis ASRP Off-Channel Habitat Summary Based on Off-Channel Extensive Surveys: 2nd Progress Report  (November 2015)
  • 2016 Chehalis ASRP Intensive Surveys in Off-Channel Habitat: 2nd Progress Report (July 2016)
  • 2016 Chehalis ASRP Instream Amphibian Surveys: 3rd Progress Report (July 2016)
  • 2015 Draft Riverscape Study Report (January 2016)
• Behavior and Movement of Adult Spring Chinook Salmon in the Chehalis River Basin (Liedtke, USGS, 2016)
• Effects of Climate Change on the Hydrology of the Chehalis River Basin (Mauger et al, July 2016)
• Chehalis Basin Strategy: Reducing Flood Damage and Enhancing Aquatic Species, Phase 1 Site Characterization, Technical Memorandum (HDR and S&W, September 2015)
• Chehalis Basin Strategy: Reducing Flood Damage and Enhancing Aquatic Species, Phase 2 Site Characterization, Technical Memorandum (July 2017)
  • • Appendices A-D
  • Appendices E-I
• Chehalis Basin Strategy: Reducing Flood Damage and Enhancing Aquatic Species, Phase 2 Site Characterization, Technical Memorandum — Draft (HDR and S&W, September 2016)
• Chehalis Basin Strategy: Flood Retention Dam Summary of Costs and Life of Dam (September 2016)
• Literature Review of the Potential Changes in Aquatic and Terrestrial Systems Associated with a Seasonal Flood Retention Only Reservoir in the Upper Chehalis Basin (March 2017)
• Landslide Reconnaissance Evaluation of the Chehalis Dam Reservoir (S&W, September 2015)
• Upper Chehalis Basin Large Wood Loading Inventory (Anchor QEA, September 2016)
• Restorative Flood Protection Technical Report – Draft (NSD, September 2016)
• Development and Calibration of the Chehalis River CE-QUAL-W2 Water Quality Model (PSU, April 2017)
• Reservoir Water Quality Model (June 2017)
  • Appendix A
  • Appendix B
  • Appendix C
  • Appendix D
  • Appendix E
• Summary of Water Quality Data Collected on February 9, 2017 and March 29, 2017 (June 2017)
• Operations Plan for Flood Retention Facilities (June 2017)
• Site Characterization and Dam Conceptual Design Presentation (December 2016)
• Upper Chehalis Basin HEC-HMS Model Development (June 2017)

Land Use/Floodplain Management Studies

• Repetitive Flood Loss Strategy (French & Associates, 2014)
• Community Rating System Program Review (French & Associates, 2014)
• Chehalis River Basin Basin-Wide Floodplain Management Assessment (French & Associates, 2014)
• Floodplain Management Assessment Master Report (French & Associates, 2015)
• Status of Improved Regulatory Standards (French & Associates, 2017)

Washington Department of Fish and Wildlife Species/Habitat Studies

• Terrestrial Amphibian Survey (2014)
• Stream-associated Amphibian Survey (4th progress report) (2017)
• Stream-associated Amphibian Survey (3rd progress report) (2016)
• Stream-associated Amphibian Survey (2nd progress report) (2015)
• Amphibian Egg Mass Off-channel Survey (2016)
• Intensive Off-channel Survey (2016)
• Waterfowl and Waterbird Abundance (2017)
• Changes in the Chehalis Floodplain: 1938-2013 (2017)
• Investigating Juvenile Life History and Maternal Run Timing of Chehalis River Spring and Fall Chinook Salmon using Otolith Chemistry (2017)
• Grays Harbor Fall Chum Abundance and Distribution, 2017 (2018)
• Movement and Home Range Study of Select Native Fishes in the Chehalis River, Washington State (2018)
• Summer Riverscape Patterns of Fish, Habitat, and Temperature in Sub Basins of the Chehalis River, 2013-2016 (2018)
• Chehalis River Smolt Production, 2018 (2019)

October 11, 2016 Policy Workshop Presentation

• Causes of Extreme Flooding

September 21, 2016 Technical Workshop Presentations

• Programmatic SEPA Draft EIS
• Species and Habitat Studies
  • Riverscape
  • Restoration potential monitoring
  • Salmon and steelhead spawning above the dam site
  • Summer rearing and movement for native fishes – in proposed dam footprint
  • Behavior and movement of adult Spring Chinook
  • Amphibian and non-salmonid fishes (includes occupancy modeling)
  • Waterfowl
• Climate Change
• Dam Operation Studies
  • Water quality
  • Fish passage
  • Geomorphology
  • Landslides analysis
  • Vegetation management plan
• Restorative Flood Protection Studies

September 22, 2016 Technical Workshop Presentations

• Programmatic SEPA Draft EIS
• Flood Retention Facilities (Dam)
• Restorative Flood Protection
• Other Large- and Local-scale Flood Protection Action Elements 
• Aquatic Species Habitat Actions
• Comparison of Combined Alternatives

Reports

• Chehalis Basin Work Group Recommendations Report (2014)
• Ruckelshaus Center Alternatives Report (2012)
• Executive Summary of the Ruckelshaus Center Alternatives Report (2012)
• Comments on the Draft Ruckelshaus Center Alternatives Report (2012)

January 21, 2016 ASRP Workshop

• Summary of January 21, 2016 ASRP Workshop
• Compiled Presentations from January 21, 2016 ASRP Workshop

October 7, 2015 Policy Workshop

• Compiled Presentations from October 7 Policy Workshop

September 22, 2015 Technical Workshop Presentations

• Confederated Tribes Porter Restoration
• Extensive Off-channel Habitat Surveys
• Instream Amphibian Surveys
• Off-channel Habitat Egg Mass Surveys
• Off-channel Habitat Beaver Assessment
• Results from a Pilot Study to Evaluate Movement and Temperature Use Patterns of Adult Spring Chinook Salmon
• Riverscape Patterns of Fish and Habitat
• September 22 Synthesis Session
• Stream-associated Amphibian Surveys
• Summer Movements of Juvenile Salmonids
• Summer Rearing Distribution Behavior of Juvenile Salmonids: Synthesis and Next Steps
• Temperature Characteristics of the Chehalis River Watershed within the Distribution of Spring Chinook Salmon
• Upper Chehalis River Smolt Trapping, 2013-2015
• Using PHABSIM to Investigate Effects of Altered Streamflow
• Water Quality Studies Completed in 2013-2015 Biennium
• WQ Technical Tasks

Technical Memos from 2013-2015 Biennium

• Aquatic Species Restoration Program Effects Report – Final
• Aquatic Species Restoration Program Report – Final
• Aquatic Species Enhancement Plan Data Gaps Report
• Chehalis Basin Strategy 2015-2017 Biennium Scope and Budget – Final
• Chehalis Phase 1 Site Characterization
• Comparison of Alternatives Report – Final
• Hydraulic Model Report – Final
• Small Projects Report – Final
• Structures in Floodplain Survey Report – Final
• Water Retention and Fish Passage Report – Final
• WSDOT I-5 Chehalis Flood Report – Final