This USGS NHDPlus High Resolution dataset provides comprehensive hydrographic data for hydrologic unit 1805 in a file geodatabase. The NHDPlus High Resolution (NHDPlus HR) dataset represents a sophisticated integration of hydrographic features, including stream networks, water bodies, and catchment boundaries. This specific file covers the 4-digit hydrologic unit 1805, delivering high-fidelity spatial information derived from the National Hydrography Dataset. It includes essential value-added attributes that facilitate complex hydrologic modeling, flow analysis, and watershed characterization. The geodatabase structure ensures that topological relationships between vector features remain intact, allowing for accurate upstream and downstream connectivity analysis across the specified region for professional environmental and engineering project requirements.

The download is a 42.9 MB file containing .ZIP files.

Professionals typically ingest this file geodatabase into GIS software like ArcGIS Pro or QGIS to perform spatial analysis or generate site-specific base maps. Once loaded, the data can be filtered by feature class, such as flowlines or water areas, and projected into a project-specific coordinate system. The included attributes allow for efficient symbology and labeling, which can then be exported as CAD-ready vector geometry for integration into site planning or civil engineering design workflows.

This dataset is indispensable for large-scale land development, infrastructure planning, and environmental impact assessments where water management is a critical factor. It serves as a foundational layer for civil engineers and landscape architects working on regional masterplans, flood risk studies, or drainage design. By leveraging this authoritative public-domain data, practitioners can ensure their site analysis is based on accurate, standardized hydrographic information, particularly when evaluating catchment areas, stream connectivity, and water resource management for diverse municipal, residential, and industrial project sites.