The City of Corvallis Stormwater Master Plan (SWMP) recommends policies, activities, and programs formulated to improve water quality, address existing and future conflicts between flooding and development, and preserve and enhance valuable natural resources, including stream and floodplain systems. It is intended to guide upgrades and expansion of the stormwater conveyance system and to guide stormwater management within the City over the next 20 years.

The recommendations will directly affect the City's capital improvement and operating programs. In addition, new policies and development standards have been recommended that will affect the way future development is conducted within the area. Implementation of the SWMP will require the active involvement and cooperation of all property owners, City departments, and State and federal agencies.

Over a 5-year period, the City and the technical consultant team worked closely with citizens, a 13-member Stormwater Planning Committee (SWPC) appointed by the Mayor, Benton County, and relevant regulatory agencies to develop the SWMP. Implementation of the SWMP will require active involvement of property owners, all City departments, state and federal agencies, and local stakeholders.

Download the SWMP: 

Table of Contents

  • Abbreviations
  • Glossary
  • Table of Contents
  • Executive Summary

Chapter 1 - Introduction

Describes the authorization and purpose, background, objectives, and processes for developing the SWMP.

Chapter 2- Public Involvement

Describes the major elements of the public involvement and outreach processes along with a summary of the results.

Chapter 3- Basis of Planning

Describes the basis for hydrologic and hydraulic modeling, the engineering standards to be used in developing alternatives, methods for estimating project costs, strategies used for developing improvement programs, and a summary of the regulations impacting the SWMP.

Chapter 4- Study Area Characteristics

Describes the physical characteristics of the study area including geography, land use, geology, soils, climate, rainfall, and a description of the conveyance system.

Chapter 5- Community-Wide Stormwater Planning and Policies

Summarizes the existing planning framework and presents recommended policies for addressing the major issues that impact stormwater management within the City.

Chapters 6 - 13 - Watershed Planning and Analysis

Describes the physical characteristics of the following watersheds, summarizes the major findings from the public process, documents City experience in the area, presents deficiencies in the conveyance system as identified by modeling, identifies problem areas, and recommends projects and activities to address deficiencies and to protect water quality, the creek, and natural resources in the area.

Chapter 6- Watershed Planning and Analysis: Dixon Creek

Chapter 7- Watershed Planning and Analysis: Squaw Creek

Chapter 8- Watershed Planning and Analysis: Jackson/Frazier/Village Green Creeks

Chapter 9- Watershed Planning and Analysis: Sequoia Creek

Chapter 10- Watershed Planning and Analysis: Garfield Basin

Chapter 11- Watershed Planning and Analysis: Oak Creek

Chapter 12- Watershed Planning and Analysis: Marys River

Chapter 13- Watershed Planning and Analysis: South Corvallis

Chapter 14- Implementation Plan


Table of Contents

Appendix A- Public Involvement

  • Public Opinion Survey
  • Summary of Stakeholder Surveys
  • Corvallis Chamber of Commerce Memorandum
  • Barney & Worth, Inc. Response to Chamber Memorandum
  • Evaluation Criteria
  • Citizen Input Workbook, Information Packet and Summary of Exercise
  • Citizen Input on Policies and Short-Long Terms Basin Programs
  • Excerpts of Meeting Minutes from USC on 8/14/01 & 8/16/01

Appendix B- Streamwalk Summary

  • Dixon Creek
  • South Fork Squaw Creek
  • Lower Squaw Creek
  • Lower Sequoia Creek
  • Oak Creek

Appendix C- Technical Memorandum No. 1

  • Hydrologic and Hydraulic Modeling Methodology and Results

Appendix D- Technical Memorandum No. 2

  • Basis of Costs

Appendix E- Technical Memorandum No. 3

  • Potential Best Management Practices for Stormwater

Appendix F- Technical Memorandum No. 4

  • Recommendations to Development Standards

Appendix G- Federal Register for ESA 4(D) Rule

Appendix H- NPDES Phase II Stormwater Permit Regulations

Last updated: 9/7/2012 4:51:46 PM