The U.S. Geological Survey (USGS), in cooperation with local, State, and Federal agencies, operates a network of 50 continuously recording stream-gaging stations in New Hampshire (fig. 1). Accurate and unbiased information provided by these USGS stations on the amount of water in rivers, streams, lakes, and reservoirs in New Hampshire is essential to safeguarding lives and property, monitoring and managing water resources, and understanding the effects of climate and land-use change on hydrology.