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The Depth to Seasonal High Groundwater provides the best available city wide groundwater data. The depth to seasonal high water table values are interpolated from observed local groundwater and surface water
elevations where spatial variability due to widely ranging groundwater monitoring locations has not been incorporated. As such, groundwater depth should be verified with field measurements where site specific work is
desired and where depth to groundwater is considered important.
Source: 2008 Final USGS Portland Area Depth to Groundwater. Ranges in Feet. |