The EPA EnviroAtlas Number of Dams per 12-Digit HUC dataset was clipped to the boundary of the study site, Utah and the Colorado Plateau Ecoregion. Original Metadata: This EnviroAtlas dataset is a summary of the National Dams Inventory data from 2009 survey. The file contains counts (EA_NIDamCount attribute) of inventoried dams by 12-digit hydrologic units codes (March 2011) and total maximum storage capacity in millions of gallons (EA_NIDams_DN attribute). This dataset was produced by the US EPA to support research and online mapping activities related to EnviroAtlas. EnviroAtlas (http://enviroatlas.epa.gov/EnviroAtlas) allows the user to interact with a web-based, easy-to-use, mapping application to view and analyze multiple ecosystem [...]