The last update to this data was completed on 6/22/2020,
this update focused on reviewing existing waterbodies and folding in missing
waterbodies for the Chemung HUC (02050105) and the Tioga HUC (02050104). A
History of edits is listed below. The full statewide dataset can be downloaded
from: https://www.usgs.gov/national-hydrography/access-national-hydrography-products
Web Service url - https://gisservices.its.ny.gov/arcgis/rest/services/NYS_Hydrography/MapServer
This web service is a subset for New York State of the
National Hydrography Dataset (NHD), there is more information about each layer
in the description of the groups and specific layers. The 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 system.
NHD data was originally developed at 1:100,000-scale and exists at that scale
for the whole country. This high-resolution NHD, generally developed at 1:24,000/1:12,000
scale, adds detail to the original 1:100,000-scale NHD. Local resolution NHD is
being developed where partners and data exist. The NHD contains reach codes for
networked features, flow direction, names, and centerline representations for
areal water bodies. Reaches are also defined on waterbodies and the approximate
shorelines of the Great Lakes and the Atlantic Ocean. The NHD also incorporates
the National Spatial Data Infrastructure framework criteria established by the
Federal Geographic Data Committee. -- History of edits 02/18/2020 -- Waterbody
Updates to Southern Long Island HUC (02030202) & Owego-Wappasening HUC
(02050103) 10/04/2019 – Waterbody Updates to Upper Susquehanna HUC (02050101)
08/19/2019 – Waterbody Updates to Chenango HUC (02050102) & Northern Long
Island HUC (02030201)
Please contact NYS ITS Geospatial Services at nysgis@its.ny.gov if you have any questions.