This is the Department's legacy master stream coverage. The last updates to this layer occurred in late 2004. This layer has been replaced by the High Resolution National Hydrography Dataset (NHD) and
Pennsylvania Spatial Data Access (PASDA)2026-07-03 更新00
This is the Department's legacy master stream coverage. The last updates to this layer occurred in late 2004. This layer has been replaced by the High Resolution National Hydrography Dataset (NHD) and
Identification of currently designated ORWs as well as prospective candidates for possible designation at a later date. ORWs are designated by the Secreta