Damascus Natural Features Inventory Natural Resources Report
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DAMASCUS NATURAL FEATURES INVENTORY NATURAL RESOURCES REPORT Prepared for: CITY OF DAMASCUS 19920 SE Highway 212 Damascus, Oregon 97089 Prepared by: WINTERBROOK PLANNING 310 SW Fourth Ave., Suite 1100 Portland, Oregon 97204 July 2007 Plan Update Adopted by City Council on X, 2013 Damascus Natural Features Inventory Goal 5 Natural Resources Report July 2007 Damascus Natural Features Inventory Natural Resources Report Table of Contents Introduction ................................................................................................................................... 1 Summary of Findings ................................................................................................................... 2 Wetlands ..................................................................................................................................... 3 Riparian Corridors ...................................................................................................................... 3 Wildlife Habitat .......................................................................................................................... 3 Groundwater Resources .............................................................................................................. 4 Scenic Waterways ....................................................................................................................... 4 Study Area Overview .................................................................................................................... 4 Climate ........................................................................................................................................ 4 Topography ................................................................................................................................. 6 Hydrology ................................................................................................................................... 6 Geology ....................................................................................................................................... 7 Soils............................................................................................................................................. 8 Public Involvement and Agency Coordination .......................................................................... 9 Public Involvement ..................................................................................................................... 9 Agency Coordination ................................................................................................................ 11 Wetlands ...................................................................................................................................... 12 Inventory Methods .................................................................................................................... 12 Review of Existing Information .......................................................................................................... 13 Field Inventory ................................................................................................................................... 13 Wetland Function and Condition Assessment .................................................................................... 14 Mapping Procedures .......................................................................................................................... 16 Inventory Results ...................................................................................................................... 17 Wetland Classes ................................................................................................................................. 17 Summary ............................................................................................................................................. 20 Wetland Assessment Results .................................................................................................... 21 Significant Wetlands Determination ......................................................................................... 25 Riparian Corridors ..................................................................................................................... 26 Inventory Methods .................................................................................................................... 26 Review of Existing Information .......................................................................................................... 27 Field Inventory ................................................................................................................................... 29 Functional Assessment and Significance Determination ................................................................... 29 Inventory Results ...................................................................................................................... 31 Riparian Corridor Assessment Results ..................................................................................... 34 Damascus Natural Features Inventory Goal 5 Natural Resources Report July 2007 Significant Riparian Corridor Determination ........................................................................... 36 Wildlife Habitat ........................................................................................................................... 37 Inventory Methods .................................................................................................................... 37 Review of Existing Information .......................................................................................................... 37 Field Inventory ................................................................................................................................... 38 Inventory Results ...................................................................................................................... 40 Assessment Summary.......................................................................................................................... 43 Significant Habitat Determination ............................................................................................ 45 Groundwater Resources ............................................................................................................. 47 Inventory Methods .................................................................................................................... 47 Inventory Results ...................................................................................................................... 48 Significant Groundwater Resource Determination ................................................................... 49 Oregon Scenic Waterways ......................................................................................................... 50 Overview ................................................................................................................................... 50 Significant Oregon Scenic Waterway Determination ............................................................... 50 Implementation Options............................................................................................................ 50 Appendices Appendix A. Definitions Appendix B. References Appendix C: Wetland Characterization Sheets Appendix D: Wetland Assessment Summary Sheets Appendix E: OFWAM Summary Sheets Appendix F: Wetland Data Sheets Appendix G: Riparian Corridor Summary Sheets Appendix H: Wildlife Habitat Assessment Summaries Appendix I: Clackamas River Scenic Waterway Management Program and Background Report Appendix J: Wetland Staff Qualifications Tables Table 1. Rainfall averages and actual levels for the 2006-2007 Water Year. Table 2. Daily Rainfall, February through April, 2007. Damascus Natural Features Inventory Goal 5 Natural Resources Report July 2007 Table 3. Damascus Sub-basins and Acreages Table 4. Damascus Soil Characteristics Table 5. Wetland Size by Subwatershed Table 6. Wetland Cowardin Classifications Table 7. Wetland Hydrogeomorphic Classifications Table 8. Wetlands by Subwatershed Table 9. OFWAM Wetland Assessment and LSW Results Table 10. Wetland Assessment Results for Key Wetland Functions Table 11. Watersheds, Subwatersheds, and Acres within Damascus Table 12. Riparian Site Characteristics, Length and Area Table 13. Riparian Functional Assessment Summary Table 14. Riparian Functional Assessment Results Table 15. Summary of Habitat Site Characteristics Table 16. Habitat Assessment Summary Figures Figure 1. Vicinity Map Figure 2. Soil Types within Damascus Figure 3. Wetland and Water Resource Inventory Figure 4. Wildlife Habitat and Riparian Corridors Figure 5. Groundwater Inventory Figure 6. Oregon Scenic Waterway Damascus Natural Features Inventory Goal 5 Natural Resources Report July 2007 Damascus Natural Features Inventory Goal 5 Natural Resources Report July 2007 Introduction In 2006, The City of Damascus, through a Goal 5 Planning grant from the Oregon Department of Land Conservation and Development, retained a consultant team led by Winterbrook Planning to conduct an inventory of natural resources within the city limits In 2012 the City Council funded an update the Natural Resources Inventory in response to concerns of accuracy of the original. In 2012 the City asked each property owner with a mapped natural