The Columbia River Estuary Ecosystem Classification Supplying comprehensive information on landforms, vegetation, and manmade features in the Columbia River estuary THE COLUMBIA RIVER ESTUARY ECOSYSTEM CLASSIFICATION inventories Photo credits: All photos in this document were taken by a highly diverse set of natural and manmade features—and the wide Charles Cannon (United States Geological Survey) unless otherwise noted. variety of processes that formed them—making it a valuable tool for Photo locations: Cover and frontispiece: Cunningham Slough on research, monitoring, resource management, and restoration planning. Sauvie Island, OR. Back Cover: Marsh, Karlson, and Russian Islands. Features key: Cathlamet Bay, OR. ID Complex Catena Biocatena Anthropogenic 1 Crevasse Splay Tie Channel Tidal Deciduous Wetland --- 2 Crevasse Splay Wetland Tidal Herbaceous Wetland --- 3 Crevasse Splay Wetland Tidal Deciduous Wetland --- 4 Crevasse Splay Floodplain Channel Water --- 5 Crevasse Splay Natural Levee Tidal Deciduous Wetland --- 6 Floodplain Ridge and Swale Natural Levee Non-Tidal Deciduous Wetland --- 7 Floodplain Ridge and Swale Natural Levee Agricultural --- 8 Floodplain Backswamp Lake Bed Agricultural --- 9 Floodplain Backswamp Wetland Tidal Herbaceous Wetland --- 10 Floodplain Backswamp Lake/Pond Water --- 11 Floodplain Floodplain Channel Water --- 12 Tributary Secondary Channel Permanently Flooded Water --- 13 --- --- --- Levee Acknowledgments The Estuary Partnership acknowledges the following people for their significant contributions to the Columbia River Estuary Ecosystem Classification: Keith Marcoe and Krista L. Jones — Lower Columbia Estuary Partnership Charles A. Simenstad, Jennifer L. Burke, Mary F. Ramirez, and Danelle W. Heatwole — University of Washington Jim E. O’Connor, Charles Cannon, Ian R. Waite, and Timothy D. Counihan — United States Geological Survey WETLAND ECOSYSTEM TEAM This document was created with the help of Ann Sihler, technical writer, and Vickie Nissen, NISSEN Design/Graphics. UNIVERSITY OF WASHINGTON The Columbia River Estuary Ecosystem Classification What is the ecosystem classification? The Columbia River Estuary Ecosystem Classification is a For more information GIS-based system for classifying and mapping landforms and land cover For more information or to access the types in the Columbia River estuary. Combining previously collected classification, go to www.estuarypartnership. 1 information and new data the classification represents the most org/columbia-river-estuary-ecosystem- comprehensive, up-to-date inventory yet of the estuary’s natural and classification. manmade features and is suitable for use in research, monitoring, resource management, and restoration planning. The products of the classification— its high-resolution data and maps—are freely available to anyone seeking to better understand this unique landscape’s physical features and ecosystems, Inside: how they formed, and what their future might be. Key aspects Quantify baseline conditions and monitor changes Locate ecosystems of interest More about the Columbia River Ecosystem Classification Understand spatial distributions How can we use the classification? Evaluate ecological metrics related to the amount, diversity, and fragmentation of ecosystems2 What is the classification Distinguish between ecosystems created by relatively infrequent telling us so far? geological events and those formed by more common processes A tool for considering the Predict the ecological development of a site estuary’s future The classification organizes and describes features large and small, created Complexes and catenae summarized by forces ranging from tectonic to tidal. In many cases the classification links Features of special interest features to historical geologic events or to ongoing processes that continue to shape the modern estuary. Selected classification output: maps and tables Who created the classification? The Lower Columbia Estuary Partnership collaborated with geologists, wetland scientists, and GIS experts at the U.S. Geological Survey and University of Washington in developing the classification. Funding came from the Bonneville Power Administration and U.S. Army Corps of Engineers. 1 Data newly collected or compiled for the ecosystem classification include land cover, land elevation, shallow- water bathymetry, agricultural ditches, wastewater treatment ponds, road fill, and general fill. 2 Ecological metrics include the number, area, edge density, patch richness, and diversity of different ecosystems in the estuary, plus the distance and degree of connection between ecosystem patches. The Columbia River Estuary Ecosystem Classification 1 Key aspects of the classification A complete study area. The ecosystem classification covers the entire Columbia River estuary and its floodplain, from the mouth of the Columbia River to Bonneville Dam, 146 miles upstream. By analyzing the entire estuary, the classification supports comprehensive, informed study of the full continuum of estuarine ecosystems. High-resolution GIS-based system. All information in the classification is digital, which allows for easy quantification and analysis. The classification can quickly answer questions about how extensive different ecosystems are in the estuary, where they are located, and what important ecological attributes they display, such as shape, LOCATION AND STUDY AREA. The approximate vegetation characteristics, and proximity to similar ecosystems. historical floodplain of the lower Columbia River defines . In creating the ecosystem classification, the lateral extent of mapping for the classification. Current, comprehensive data Lengthwise, the study area extends from the Pacific geologists and wetland scientists integrated the most current data Ocean 146 miles upstream to Bonneville Dam. available—in some cases compiling new data sets—to map features of interest. The resulting data and maps reflect current understanding of the dominant physical and biological characteristics of the estuary’s ecosystems, and how they formed. New vocabulary for better understanding. The classification uses terminology that brings a new level of precision to discussion of the estuary’s natural features. For example, the classification maps surge plains (which are formed by tidal flooding), tie channels (which connect floodplain lakes to the main river), and floodplain features such as backswamps, crevasse splays, and ridge and swale topography. By precisely defining and inventorying these features, the classification documents important formative processes that have not necessarily been described and measured before in the estuary. Detailed narrative. Creators of the ecosystem classification wrote in- depth descriptions of the natural and manmade features inventoried in the classification and notable occurrences in the estuary.3 National Agricultural Inventory(NAIP) (2009) Program Non-proprietary. The classification’s maps and data are non- proprietary, so they are available free of charge to anyone wanting to analyze the estuary for research, monitoring, resource management, or restoration planning. In addition, although the classification was developed specifically for the Columbia River estuary, its methods are comprehensive enough that they can be applied to other large, freshwater-dominated estuaries around the world.4 HIGH-RESOLUTION MAPPING. The classification turns aerial photos and other landscape data into 3 These narrative descriptions are as yet unpublished. For interim descriptions of ecosystem complexes and high-resolution digital maps that show features as geomorphic catenae, contact Jim O’Connor of the U.S. Geological Survey ([email protected]). small as ¼ acre. This example illustrates the detail 4 At the time of this writing, developers of the ecosystem classification were in the process of fully of land cover mapping around the Astoria airport, documenting their methods and results. For more information, contact the Lower Columbia Estuary near Warrenton, Oregon. Partnership. For interim descriptions, see U.S. Geological Survey Open File Report 2011-1228, Columbia River Estuary Ecosystem Classification—Concept and Application (C.A. Simenstad et al., 2011), available at http://pubs.usgs.gov/of/2011/1228/. 2 The Columbia River Estuary Ecosystem Classification More about the Columbia River Ecosystem Classification5 Ecosystem classifications are tools for organizing information. They provide Key physical processes a framework for identifying the different components of complex natural in the estuary systems and specifying the relationships among those components. In this, Tides the Columbia River Ecosystem Classification is no different from other classifications. It identifies and maps the ecosystems in the Columbia River Floods and fluvial sediment transport estuary, using an organizational structure that reflects the various geologic, Wind-driven sediment transport hydrologic, and biological processes that drive the evolution of estuarine Landslides and debris flows ecosystems. Late Holocene sea-level changes An inventory of ecosystems Volcanism At one level, the classification is simply an inventory of the current Subduction zone earthquake cycle ecosystems in the estuary. It tallies how many there are of each type, their size and shape, their location, and where they are situated in relationship Erosion to each other. How much surge plain has been isolated from tidal influence, and how much of this is being used