The hydrogeomorphic (HGM) approach to assessment of wetland and riparian functions is based on two main concepts: First, wetlands in a region that share the same landscape setting and hydrologic regime will support similar functions. Second, levels of function at one site can be compared on a scale to functions of multiple reference sites of the same type. Following this approach, the various landscape settings and hydrologic regimes that influence wetland functions have been classified for each of 10 ecoregions in Oregon.

The Statewide Classification and Profiles guidebook provides this framework for future development of wetland and riparian function assessment tools for statewide application. Models for assessing Riverine Impounding and Slope/Flat HGM subclasses in the Willamette Valley ecoregion are presented in Assessment Methods and Technical Report guidebooks, and accompanying CD. The three guidebooks were researched and written for the Oregon Division of State Lands (DSL) by Paul Adamus, with funds from the EPA. Full citations and information on ordering the guidebooks can be found on the DSL website: http://statelands.dsl.state.or.us . At this time, the only state regulatory requirement involving HGM is the identification of HGM class for impact and mitigation sites. DSL encourages experimental applications of the methods and will appreciate feedback from those who have used it. The agency will also be conducting some testing and training on the methods. For further information, email dana.field@dsl.state.or.us.

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