{ "currentVersion": 10.71, "id": 67, "name": "HUC 8 Dam Density", "type": "Feature Layer", "description": "This layer is comprised of U.S.G.S. sub-basins categorized based on the density of dams within the sub-basin (dams/mile2<\/sup>) into 'Low', 'Medium-Low', 'Medium-High', and 'High' categories. For more information about how dam density was calculated, see our