2019-2021 Biennium Studies
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)
- 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)
- 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)
- 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
September 21, 2016 Technical Workshop Presentations
- Programmatic SEPA Draft EIS
- Species and Habitat Studies
- Climate Change
- Dam Operation Studies
- 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
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