-
State
Arctic Strategic Transportation and Resources (ASTAR) project 2023 field station location data and descriptions: Point Lay region, North Slope, Alaska
State of Alaska —
Arctic Strategic Transportation and Resources (ASTAR) project 2023 field station location data and descriptions: Point Lay region, North Slope, Alaska, Raw Data File... -
State
MD iMAP: Maryland Watersheds - 12 Digit Watersheds
State of Maryland —
This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. This file (SWSHED12) is a statewide digital watershed file. It was created... -
State
MD iMAP: Maryland Wetlands - Wetlands Polygon (Special State Concern)
State of Maryland —
This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. In Maryland certain wetlands with rare - threatened - endangered species or... -
State
MD iMAP: Maryland Gauges - Tide Gauge Locations
State of Maryland —
This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. This data layer shows the locations of NOAA tide gauges in Maryland.... -
State
Single-beam bathymetric data near Kongiganak, Alaska, collected June 6, 2023
State of Alaska —
Single-beam bathymetric data near Kongiganak, Alaska, collected June 6, 2023, Raw Data File 2024-4, presents bathymetric data collected along the Kongnignanohk River... -
State
MD iMAP: Maryland Water Quality - Tier II High Quality Waters 2012
State of Maryland —
This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. The intent of this dataset is for it to be used to produce maps and provide... -
State
Groundwater Capture Zones
State of Iowa —
Groundwater capture zones are area projected to the land surface determined to provide water to the wells. Capture zones are determined for each groundwater-based... -
County
Base Map Update Years: 2020-2024
Loudoun County, Virginia —
Loudoun County, Office of Mapping and Geographic Information (OMAGI) has a seamless countywide base map geodatabase that can be used as a reference when mapping all... -
State
Subregional Basin Polygon
State of Connecticut —
See full Data Guide here.Subregional Drainage Basic Set: Connecticut Subregional Drainage Basins is 1:24,000-scale, polygon and line feature data that define... -
County
King County Ambient Streams Monitoring - Gaging Details
King County, Washington —
This dataset contains information on gaging locations associated with King County ambient stream monitoring program sites, including their status, location, and... -
State
MD iMAP: Maryland Watersheds - 8 Digit Watersheds
State of Maryland —
This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. This file (SWSUB8) is a statewide digital watershed file. It depicts the... -
State
MD iMAP: Maryland Wetlands - Wetlands Polygon (Department of Natural Resources)
State of Maryland —
This is a MD iMAP hosted service layer. Find more information at http://imap.maryland.gov. The Maryland Department of Natural resources began updating the National... -
State
6-digit HU (Basin) NGDA
State of Oregon —
Abstract: This file contains Hydrologic Unit (HU) polygon boundaries for the United States, Puerto Rico, and the U.S. Virgin Islands. The data is a seamless National... -
State
Rivers and Streams - Generalized
State of Maryland —
The digital segmented network based on watershed boundaries, ERF1-2, includes enhancements to the U.S. Environmental Protection Agency's River Reach File 1 (RF1)... -
State
Local Basin Lines
State of Connecticut —
See full Data Guide here. Drainage Basin Set: Connecticut Drainage Basins is 1:24,000-scale, polygon and line feature data that define natural drainage areas in... -
State
Phosphorus Sediment Buffer Priority
State of Maryland —
The Natural Filter Buffer Priorities for Water Quality (Phosphorus / Sediment) layers identify priority forest/grass buffer opportunities by subwatershed (MD HUC 8).... -
State
2-digit HU (Region) NGDA
State of Oregon —
Abstract: This file contains Hydrologic Unit (HU) polygon boundaries for the United States, Puerto Rico, and the U.S. Virgin Islands. The data is a seamless National... -
State
Drainage Basin Lines
State of Connecticut —
See full Data Guide here. Drainage Basin Set: Connecticut Drainage Basins is 1:24,000-scale, polygon and line feature data that define natural drainage areas in... -
City
Watercourses Designated for Protection
City of Philadelphia —
Hydrographic features included in Philadelphia Hydrology Map. This map was officially adopted by City Council as the official map of Philadelphia Watercourses... -
County
Hydrologic Information Center - Station Search
King County, Washington —
Search for monitoring stations maintained by King County's Hydrologic Information Center. (use a blank search to see all stations).