Each feature class or feature dataset is in Geographic (GCS) NAD83 unless otherwise noted
This spatial dataset contains linear aquatic habitat reaches ("reaches") and descriptions primarily based on the available Oregon 1:100,000 scale routed hydrography within the geographic area depicted by the John Day Basin third field hydrologic unit boundary (HUC). Each reach was defined as such because it has unique aquatic habitat characteristics which separate it from surrounding aquatic habitat, such as temperature, gradient, water quality, etc. The dataset also includes obstruction reaches, which may partially or fully impede focal species passage. The reaches were originally developed during the 2002-2004 Subbasin Planning effort to define habitat units to be attributed, rated, and processed by the Ecosystem Diagnosis and Treatment (EDT) model (see details below). A subset of these reaches was used in the actual EDT analysis; please see the USEDINEDT item to access the reaches processed by the EDT model. Many of the EDT ratings and results attributes are available in a separate table (edt_reach_attributes.dbf) which was linked to the reaches via the unique item, REACH_NAME. It is strongly recommended that data users consult the Mobrand Biometrics, Inc. EDT website (http://www.mobrand.com/MBI/edt.html) and the related Guidelines for Rating Selected Level 2 Environmental Attributes (http://www.mobrand.com/MBI/pdfs/AttributeRatings-June2004.pdf) to fully understand the EDT process and attribute definitions presented in this dataset.
The intended use of this dataset was for analysis in the John Day Resource Management Plan. These reaches were developed by the local Subbasin Planning team in coordination with the Technical Outreach and Assistance to Subbasins Team (TOAST; sponsored by the Columbia River Inter-Tribal Fish Commission). They were created to spatially define habitat units to be processed by Mobrand Biometric's Ecosystem Diagnosis and Treatment (EDT; http://www.mobrand.com/MBI/edt.html) model as part of the Subbasin Planning effort mandated by the Northwest Power and Conservation Council (NPCC) in 2003. (http://www.nwcouncil.org/fw/subbasinplanning/Default.htm)
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