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Derived from 1:250,000-scale USGS HUC 8 boundaries, this dataset represents the soil fine gravel fraction for the western USA. A weighted average was created for each HUC 8 watershed using approximate EMAP physical habitat substrate criteria. The values are expressed as percent by weight.
    map background search result map search result map Weighted average soil fine gravel fraction (2 mm to 5 mm) for the western USA Weighted average soil fine gravel fraction (2 mm to 5 mm) for the western USA