These data delineate the areas within Alternative B.3 of "The Draft Environmental Impact Statement (DEIS) for Essential Fish Habitat (EFH) Designation and Minimization of Adverse Impacts for the Pacific Coast Groundfish Fishery Management Plan". Alternative B.3 designates canopy kelp as Habitat Areas of Particular Concern (HAPC).

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These data are a compilation of currently available seagrass GIS data sets for the west coast of the United States. These data have been compiled from seventeen different data sources. The source data were acquired over a large range of time periods, at many different spatial resolutions using a variety of methods, including aerial photography, videography, multispectral sensors, sonar, and field surveys.

Users are cautioned to use these data as only a regional view of seagrass locations. Areas without mapped seagrass may contain seagrass, but digital data were unavailable during this data compilation.

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An Oregon coastwide inventory of canopy kelp conducted to understand the distribution of kelp in the nearshore region. The 1990 survey is the only year the entire coastline was surveyed.

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Distribution of kelp canopy was captured from geo-referenced historic NOS Survey "Smooth Sheets" in the vicinity of the Oregon Territorial Sea from the period 1868-1958. Data was captured to help improve knowledge of habitat characteristics within the Oregon Territorial Sea.

Potential uses should be mindful of the age of the source surveys (as early as 1868), and the resultant potential issues with horizontal accuracy.

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This layer was created from individual year kelp surveys to show the maximum known extent of Oregon's kelp canopy. Included are: an Oregon coastwide inventory of canopy kelp in 1990, that was conducted to understand the distribution of kelp in the nearshore region, and four other years of southern Oregon reef specific surveys.

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Polygons digitized from aerial photographs to establish biomass estimates of bull kelp, Nereocystis leutkeana, at 5 selected reefs off southern Oregon during the fall of 1996.

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