Lines representing top-of-bank of major rivers and streams in the Portland region (where mapped). River top of bank derived from 2014 LiDAR using an automated mapping method explained in the process steps below. River top of bank will be completely mapped by early 2016. Columbia Slough top of bank derived from visual interpretation of aerial photos and 2007 LiDAR data. Mapping will be expanded over time using LiDAR data and field surveys.
-- Additional Information:
Purpose: For locating top-of-bank in the Portland region
Update Frequency: As Needed
-- Metadata Link: