Including Johnson Creek, Reed Lake, Crystal Springs, Powell
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JOHNSON CREEK BASIN PROTECTION PLAN Including JOHNSON CREEK, REED LAKE, CRYSTAL SPRINGS POWELL BUTTE, AND MT. SCOTT AREAS INVENTORY, ANALYSIS, AND REGULATIONS for the CONSERVATION AND GENERAL MANAGEMENT OF WETLANDS, WATER BODIES, OPEN SPACES, AND WILDLIFE HABITAT AREAS Bureau of Planning City of Portland Adopted by City Council July 17, 1991 Effective August 16, 1991 Portland City Council 1. E. Bud Clark, Mayor Earl Blumenauer, Commissioner Dick Bogle, Commissioner Gretchen Kafoury, Commissioner Michael Lindberg, Commissioner Portland Planning Commission Martha Peck Andrews, President Richard Cooley, Vice President Stan Amy Estill Deitz Margaret Kirkpatrick Richard Michaelson Chet Orloff Vivian Parker JOHNSON CREEK BASIN PROTECTION PLAN Including: JOHNSON CREEK, REED LAKE, CRYSTAL SPRINGS POWELL BUTTE, AND MT. SCOTT AREAS Bureau of Planning Gretchen Kafoury, Commissioner-In-Charge Robert E. Stacey, Jr., Planning Director Robert E. Clay, Chief Planner, Long Range Planning and Urban Design Project Planners Gail Curtis, City Planner Duncan Brown, Senior City Planner Esther Lev, Wildlife Biologist Project Team Tim Brooks, City Planner Geoff Sauncy, Graphic lllustrator Nancy Ryan, Planning Intern Adopted by City Council July 17, 1991 Effective August 16, 1991 Ordinance No. 164472 TABLE OF CONTENTS page Background Information Chapter 1 Introduction Purpose 5 Vision 5 Summary 5 Basin Study Area 7 Regulatory Setting 8 Public Involvement 13 Chapter 2 Background Introduction 17 Flooding 17 Geology 18 Water Quality and Quantity 18 Chapter 3 Components of the Natural Resource Area Introduction 23 Components 23 Summary 27 Chapter 4 Natural Resource Inventory Process Introduction 31 Site Selection 31 Methodology 32 Summary 32 Chapter 5 Inventory of Natural Hazard Components Introduction 35 Classification ofElements 35 Existing Regulations 35 Summary 36 Chapter 6 Inventory of Urban Design Components Introduction 39 History 39 Urban Design Components 39 Classification ofElements 40 Summary 40 • page Analysis of Economic, Social, Environmental, and Energy Consequences Chapter 7 General Analysis of Natural Resource Values and Economic, Social, Environmental, and Energy Consequences of Resource Protection Introduction 45 Economic Consequences 45 Social Consequences 48 Environmental Consequences 49 Energy Consequences 52 Summary 54 Chapter 8 Inventory Site Summaries and Site Analysis of Natural Resource Valued Including the Site-Specific Analysis of Economic, Social, Environmental, and Energy Consequences of Resource Protection Introduction 61 How to Use This Chapter 61 Site Summaries 63 Protection Plan Chapter 9 Protection Measures for the Johnson Creek Basin Introduction 127 Protection Plan Policies and Objectives 128 Comprehensive Plan Amendments 133 Application of the Environmental Zone 133 Johnson Creek Basin Plan District 134 Guidelines 136 Model Areas Concept 141 Appendices A Glossary of Common Tenus 145 • B Johnson Creek Basin Plan District Regulations 149 (City Code Chapter 33.535) C Existing Environmental Zone Regulations ISS (City Code Chapter 33.430) page Appendices (continued) D Existing Nonconfonning Use Regulations 167 (City Code Chapter 33.258) E Portland Plant List 173 F Wildlife Habitat Assessment Form 185 G Johnson Creek Corridor Committee Mission 187 Statement and Program Goals H Statewide Planning Goal 5 Open Spaces, 189 Scenic and Historic Areas, and Natural Resources I Oregon Administrative Rules Chapter 660, 191 Division 16 Requirements and Application Procedures for Complying with Statewide Goal 5 J ORS 308.740-790 195 K (Partial) Bibliography 199 L Maps ofInventory Sites and Environmental and separate Plan District Zoning document BACKGROUND INFORMATION 1 CHAPTER 1 INTRODUCTION PURPOSE· VISION· SUMMARY· STUDY AREA· REGULATORY SETTING· State Local Regional Federal PUBLIC INVOLVEMENT· 3 PURPOSE The purpose of the Johnson Creek Basin Protection Plan is to identify, evaluate, and protect significant fish and wildlife habitats, ecologically and scientifically significant natural areas, open spaces, water bodies, wetlands, and the functions and values of the Johnson Creek basin as a whole, and to adopt management recommendations on specific ways to retain and restore the natural habitat areas and values. The plan is designed to comply with Statewide Planning Goal 5. VISION The Johnson Creek basin will be a beautiful natural resource that is carefully planned and nurtured, thanks to the collective efforts ofresidents, organizations, and the city. The creek will become a unique visual and functional unifying element to southeast Portland, providing neighborhood character and a sense ofplace, as well as a stormwater drainage system, wildlife corridor, recreation area, and source ofpride for Portland. Damage from high flood waters will be history. The quality of the water will be improved to the point that natural runs of anadromous fish will be re-established to levels of the past. Development will be complementary to the needs of the creek basin, so that a harmonious balance between people and nature will exist. A sense of shared stewardship for all landowners and recreational users ofthe creek will reflect the pride and commitment upheld by those who recognize it as a natural resource to be preserved for all. SUMMARY Protecting identified natural resources in the Johnson Creek corridor will occur at various levels in the land use regulation hierarchy: adoption of Comprehensive Plan policies and objectives relating directly to the Johnson Creek basin, modification of base zone densities where appropriate, application of the Environmental Zone, relocation ofthe Recreation Trail designation from the edge of Johnson Creek to the newly-purchased Springwater Line (previously known as the Belrose Line) railroad right-of-way, and modification of the Powell Butte!Mt. Scott Plan District to apply 10 much of the Johnson Creek basin. The plan district generally will protect the natural resources in three ways: I Limit housing densities in areas that are difficult or hazardous to build on due to physical constraints such as floodways, steep slopes, floodplains, or wetlands. The existing Powell Butte!Mt. Scott Plan District limits housing densities to 1.05 to 4.20 units per acre, depending on the presence ofconditions which make building hazardous. The Johnson Creek Plan District expands the Powell Butte!Mt. Scott Plan District for the length of Johnson Creek within the Portland city limits. 2 Expand plan district requirements to include protection of natural resource and neighborhood values. In addition to the variable zoning density requirements, the plan district is amended to protect resource characteristics which have been identified as having water quality, environmental, or neighborhood value. These include: exemptions for certain activities in Environmental-zoned areas which are compatible with neighborhood character and protected resources; retention of treed areas and native landscaping to aid in groundwater recharge, provide more habitat, control erosion, and continue the semi-rural neighborhood character; and provision of stormwater detention or retention facilities to improve water quality, aid in groundwater recharge, and reduce peak flood levels. 5 7"=- -- BEAVERTON Legend Johnson Creek Basin Plan District :!.~ Johnson Creek Keg) Watershed JOHNSON CREEK WATERSHED 6 3 Protect or restore habitat within the resource area as an approval criteria for new development. This is accomplished either through environmental review for proposed development in Environmental zones, or plan district regulations. The level or threshold for improvements depends upon the amount ofproposed development. Emphasis is on: protecting or restoring riparian areas along Johnson Creek, its tributaries, and drainageways; connecting upland resource areas such as parks, steep slopes, and major forested areas with the creek corridor to aid in the passage of wildlife; and promoting the use of native vegetation (especially trees) throughout the plan district. BASIN STUDY AREA Johnson Creek extends through the cities of Milwaukie, Portland, and Gresham, as well as portions of unincorporated Multnomah and Clackamas Counties. The total Johnson Creek drainage basin is about 54 square miles in size (of which only 44 square miles contribute runoff), and up to three miles wide. It also includes the cities of Cottrell, Boring, and Happy Valley. Within southeast, Portland Johnson Creek follows a generally east-west path parallel to Foster Road and the Springwater Line, a railroad right-of-way recently purchased by the City. The study area extends from SE 174th Avenue and SE Jenne Road west to Johnson Creek's confluence with the Willamette River in the City of Milwaukie, and from the southern city limits along the crest of the Boring Lava Hills northward, encompassing Powell Butte, Beggar's Tick Marsh, Crystal Springs Creek, Reed Lake, and other natural resources related to the creek. It includes the westerly 13 miles ofthe creek's total 25 mile length, its tributaries and riparian areas, as well as wetlands and well as uplands which add to the natural resource values of the basin. As part of this plan, resource protection is for only those areas within the City of Portland jurisdictional limits, although resources outside city limits were inventoried. For example, there is stretch of the creek between SE 45th and SE 76th Avenues that has been inventoried but not analyzed because it is in either unincorporated Clackamas County or the City of Milwaukie. Between SE