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Impacts of Flooding in the Johnson Creek Watershed
Laura ReadDecember 4, 2008
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Study Region
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Project Questions and Goals
•Demographic description of Johnson Creek’s residents and land value
•Land use and changes
•How flooding may play a role in shaping the land usage in Johnson Creek
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Multnomah County, Johnson Creek Watershed
• 170,000 residents on 52 mi2 of land• WPA’s renovations altered stream without improving flood
conditions• Urbanization increased flood prone area
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Johnson Creek Watershed
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• Portland awarded $2.5 million from FEMA’s Pre-Disaster Mitigation Grant Program
• East Lents: Flooded 39 times in the past 60 years
Flood Facts
Floodway
Floodplain
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• A visual property information database• Collaboration between City Bureaus
Taxlots and Identification
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Taxlot AttributesZoomed In
Sample Attribute Table
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Property Values
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Census Analysis
Census data for each tract
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Land Cover in 1992, Multnomah Co.
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Land Cover in 2001, Multnomah Co.
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Finishing Touches
•Created maps of demographic distributions: population, average house value, age, poverty, unemployment
•Analyzed Land Cover and Usage for percentages
•Still need to compare Multnomah Co. data to Johnson Creek
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Data Sources
•City of Portland: taxlots, streets, streams
•U.S. Census Bureau TigerLine and PUMA files
•USGS Seamless for 1 arc second DEM and Land Cover Data (NLCD)
•Google Earth