Each feature class or feature dataset is in Geographic (GCS) NAD83 unless otherwise noted
SPTH_POLY: The Site Potential Tree Height (SPTH_POLY) dataset represents spatial location and basic information about the average maximum height of the tallest dominant trees (200 years or older) for a given site class in Western Oregon. Site potential tree heights generally range from 140 feet to 240 feet, depending on site productivity.
This dataset is used to determine the extent of riparian reserve land use allocations around streams and rivers managed under one of the two 2016 RMPs for western Oregon. For perennial or fish-bearing streams, the extent is one site potential tree height distance on either side of the stream from the ordinary high water line or from the outer edge of the channel migration zone for low-gradient alluvial shifting channels, whichever is greatest. For intermittent and non-fish-bearing streams in Class I and Class II subwatersheds, the extent is one site-potential tree height distance from the ordinary high water line on either side of the stream.