Joseph P Nielsen
Joseph Nielsen is currently acting as the Director of the Observing Systems Division (OSD) for the USGS Water Resources Mission Area.
Joe is currently acting as director of the Observing Systems Division (OSD) within the USGS Water Resources Mission Area. In this role he leads a broad team to develop and support innovative and trusted methods for data collection to assess water availability, including quantity and quality, to meet the water management and prediction needs of the Nation.
Joe also serves as the Delaware River Master, administering the provisions of the 1954 Supreme Court that established the position, relating to yields, diversions, and releases; conserving the waters of the river; compiling data on the water needs of the parties; checking and correlating streamflow measurements and records; observing, recording, and studying the effect of developments in the watershed on water supply and other uses; and making periodic reports to the Court.
Professional Experience
Director (acting), U.S. Geological Survey, Water Resources Mission Area, Observing Systems Division – 2025-Present
Delaware River Master, U.S. Geological Survey, Water Resources Mission Area – 2025-Present
Director, U.S. Geological Survey, Water Resources Mission Area, Integrated Information Dissemination Division – 2018-2025
Chief Projects Officer, USGS Water Resources Mission Area – 2017-2018
Associate Chief of Projects, USGS Office of Water Information – 2015-2017
Chief, National Water Information System – 2014-2015
Hydrologist, USGS Office of Surface Water – 2002-2014
Data Section Chief, USGS Maine District – 1992-2002
Hydrologist, USGS New England District – 1988-1992
Education and Certifications
B.S. Civil and Environmental Engineering, 1988. University of Wisconsin -Madison
Former Professional Engineer – Wisconsin, Maine