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The National Hydrography Dataset (NHD) is a feature-based database that interconnects and uniquely identifies the stream segments or reaches that make up the nation's surface water drainage...
Search relevance: 1.00 | Views last month: 49 | Catalog Last Checked: September 10, 2026 at 09:17 PM -
The USGS 3D Hydrography Program (3DHP) ArcGIS REST service (3DHP_all) from The National Map is the first of several data services that will be delivered by the 3D Hydrography Program. The...
Search relevance: 1.00 | Views last month: 23 | Catalog Last Checked: September 10, 2026 at 06:42 PM -
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 representation of HU...
Search relevance: 1.00 | Views last month: 14 | Catalog Last Checked: October 06, 2026 at 11:15 PM -
The Sea Turtle Stranding and Salvage Network (STSSN) was formally established in 1980 to collect information on and document the stranding of marine turtles along the U.S. Gulf of Mexico and...
Search relevance: 1.00 | Views last month: 13 | Catalog Last Checked: August 02, 2026 at 12:48 PM -
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 representation of HU...
Search relevance: 1.00 | Views last month: 11 | Catalog Last Checked: October 06, 2026 at 11:15 PM -
The USGS 3D Hydrography Program (3DHP) ArcGIS REST service (3DHP_all) from The National Map is the first of several data services that will be delivered by the 3D Hydrography Program. The...
Search relevance: 1.00 | Views last month: 11 | Catalog Last Checked: September 10, 2026 at 06:39 PM -
A survey of sediment toxicity was carried out by NOAA's National Status and Trends Program in the coastal bays that surround Long Island Sound in New York and Connecticut. The survey objectives...
Search relevance: 1.00 | Views last month: 10 | Catalog Last Checked: August 02, 2026 at 04:58 PM -
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 representation of HU...
Search relevance: 1.00 | Views last month: 10 | Catalog Last Checked: October 06, 2026 at 11:14 PM -
This dataset contains the common names of the national forests and grasslands and their respective FS WWW URL information that is used for both display of the national forest and national...
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An area encompassing all the National Forest System lands administered by an administrative unit. The area encompasses private lands, other governmental agency lands, and may contain National...
Search relevance: 1.00 | Views last month: 8 | Catalog Last Checked: September 10, 2026 at 06:40 PM -
The High Resolution National Hydrography Dataset Plus (NHDPlus HR) is an integrated datset of geospatial data layers, including the most current National Hydrography Dataset (NHD),...
Search relevance: 1.00 | Views last month: 8 | Catalog Last Checked: September 10, 2026 at 08:47 PM -
This study was based on the sediment quality triad (SQT) approach. A stratified probabilistic sampling design was utilized to characterize the Chesapeake Bay system in terms of chemical...
Search relevance: 1.00 | Views last month: 7 | Catalog Last Checked: August 02, 2026 at 04:57 PM -
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 representation of HU...
Search relevance: 1.00 | Views last month: 7 | Catalog Last Checked: October 06, 2026 at 11:15 PM -
The 2025 cartographic boundary shapefiles are simplified representations of selected geographic areas from the U.S. Census Bureau's Master Address File / Topologically Integrated Geographic...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: August 01, 2026 at 04:37 AM -
This file contains boundaries for each Town in the state, including the DCF Region and Area Office responsible for providing services to each Town. This data is as of 7/1/2014, is unlikely to...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: September 10, 2026 at 06:41 PM -
A GSA designated geographical segment of the United States represented by a number 1-11. Federal Facilities are geographically grouped by regions.
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: September 10, 2026 at 05:46 PM -
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 representation of HU...
Search relevance: 1.00 | Views last month: 6 | Catalog Last Checked: October 06, 2026 at 11:15 PM -
This study was based on the sediment quality triad (SQT) approach. A stratified probabilistic sampling design was utilized to characterize the Delaware Bay system in terms of chemical...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: August 02, 2026 at 04:57 PM -
This is a boundary file showing the catchment area for which each of the 6 DCF Regions is responsible. Catchment areas are comprised of complete Towns, but not necessarily complete Zip Codes. Data...
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: September 10, 2026 at 06:40 PM -
The toxicity of sediments in Pensacola, Choctawhatchee, St. Andrew and Apalachicola Bays was determined as part of bioeffects assessments performed by NOAA's National Status and Trends Program....
Search relevance: 1.00 | Views last month: 5 | Catalog Last Checked: August 02, 2026 at 04:57 PM
