13 datasets found for "Surface Hydrography"
-
Federal
EnviroAtlas - 303(d) Impairments by 12-digit HUC for the Conterminous United States
U.S. Environmental Protection Agency —
This EnviroAtlas dataset depicts the total length of stream or river flowlines that have impairments submitted to the EPA by states under section 303(d) of the Clean... -
Federal
National Hydrography Dataset Plus - NHDPlus
U.S. Environmental Protection Agency —
This high-level metadata data document will be supplemented with detailed regional metadata at a later date. The NHDPlusV2 is an integrated suite of application-ready... -
Federal
NHD Levee Centerlines, EPA Region 9, 2011, NHD
U.S. Environmental Protection Agency —
This line feature class contains levee centerlines for EPA Region 9. The National Hydrography Dataset (NHD) is a feature-based database that interconnects and... -
Federal
EnviroAtlas - Watershed Index Online Water Mask for the Conterminous United States
U.S. Environmental Protection Agency —
This data layer represents all surface water features in the United States. This grid was created by combining water features identified in two sources, the 2019... -
Federal
San Francisco Bay Water Quality Improvement Fund Major River and Tributary Lines, San Francisco Bay CA, 2019, U.S. EPA Region 9
U.S. Environmental Protection Agency —
This feature class contains 20 line features representing the major rivers and tributaries in the San Francisco Bay Area affected or potentially affected by projects... -
Federal
EnviroAtlas - Watershed Index Online Hydrologically Connected Zone Mask for the Conterminous United States
U.S. Environmental Protection Agency —
The Hydrologically Connected Zone (HCZ) Mask was determined using grid analysis to combine surface water features in the United States from three datasets: First, the... -
Federal
EnviroAtlas - 2016 Riparian Tree Canopy Cover by 12-digit HUC for Puerto Rico and the US Virgin Islands
U.S. Environmental Protection Agency —
This EnviroAtlas dataset represents the percentage of land area that is classified as tree canopy cover using the National Land Cover Database 2016 USFS Tree Canopy... -
Federal
EnviroAtlas - 2016 Riparian Land Cover Proportions by 12-Digit HUC for Alaska
U.S. Environmental Protection Agency —
This EnviroAtlas dataset represents the percentage of land area that is classified as forest, forest including woody wetlands, and natural land cover that occurs... -
Federal
EnviroAtlas - 2016 Riparian Tree Canopy Cover by 12-digit HUC for the Conterminous United States
U.S. Environmental Protection Agency —
This EnviroAtlas dataset represents the percentage of land area that is classified as tree canopy cover using the National Land Cover Database 2016 USFS Tree Canopy... -
Federal
EnviroAtlas - Watershed Index Online Riparian Zone Mask for the Conterminous United States
U.S. Environmental Protection Agency —
The Riparian Zone Mask represents surface water in the United States and its estimated riparian zone. These areas were determined using grid analysis of an... -
Federal
EnviroAtlas - Waterbody area by 12-digit HUC for the Conterminous United States
U.S. Environmental Protection Agency —
This EnviroAtlas dataset depicts the total waterbody area by 12-digit HUC for the Conterminous US from the US Geological Survey's high-resolution National Hydrography... -
Federal
EnviroAtlas - Predicted drinking water nitrate violations by 12-Digit HUC for the Conterminous United States
U.S. Environmental Protection Agency —
This map displays predicted probability of a 12-digit Hydrologic Unit (HUC12) being at risk of violating the drinking water nitrate standard. Risk is defined as there... -
Federal
EnviroAtlas - 2016 Riparian Tree Canopy Cover by 12-digit HUC for Hawaii
U.S. Environmental Protection Agency —
This EnviroAtlas dataset represents the percentage of land area that is classified as tree canopy cover using the National Land Cover Database 2016 USFS Tree Canopy...
13 datasets found for "Surface Hydrography"