| Oregon Streamflow Duration Assessment Method |
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| Field Method Determination |
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 The Oregon Streamflow Duration Assessment Method is a scientific rapid-assessment field tool developed to help determine whether a stream is perennial, intermittent or ephemeral. This tool has been developed for use in Oregon to provide technical guidance when identifying waters that may be subject to the regulatory jurisdiction under Oregon’s Removal-Fill Law and Section 404 of the Clean Water Act.
Use of the method is recommended but not required. Regulators, consultants and natural resource specialists are encouraged to use the method, because it will make it easier to provide information the Oregon Department of State Lands and Corps of Engineers need to make more timely and predictable jurisdictional determinations. The agencies have released the method for use as an interim version. It will be tested for one year before it is finalized, and the agencies encourage practitioners and the public to provide comments on their experience using it.
Below, you will find a Joint Public Notice that describes the method and provides information on training and use. Also below are links to the method, the field data form and supporting information.
For more information, contact:
U.S. EPA: Tracie Nadeau (nadeau.tracie@epa.gov) - 503-326-3685
U.S. Army Corps of Engineers: Michael Turaski (Michael.R.Turaski@usace.army.mil) - 503-808-4381
Oregon Department of State Lands: Peter Ryan (peter.ryan@state.or.us) - 503-986-5232
Training sessions are scheduled to help interested parties become more familiar with the method. Please see the Public Notice for additional logistics and registration information.
Portland: April 21-22, 2009 US Fish and Wildlife Service - Regional Office 911 NE 11th Avenue, Portland (Lloyd Center/NE 11th Avenue MAX Station)
Medford: May 6-7, 2009 Bureau of Land Management - Medford District Office 3040 Biddle Road
LaGrande: June 15-16, 2009 US Forest Service - LaGrande Ranger District Office 3502 Highway 30
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