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Rainfall from a storm on October 24–27, 2017, and Tropical Storm Philippe on October 29–30, created conditions that led to flooding across portions of New Hampshire and western Maine. On the basis of streamflow data collected at 30 selected U.S. Geological Survey (USGS) streamgages in the Androscoggin River, Connecticut River, Merrimack River, and Saco River Basins, the storms caused minor to moderate flooding in those basins on October 30–31, 2017. During the storms, the USGS deployed hydrographers to take discrete measurements of streamflow. The measurements were used to confirm the stage-to-streamflow relation (rating curve) at the selected USGS streamgages. Following the storms, hydrographers documented high-water marks in support of indirect measurements of streamflow. Seven streamgages with greater than 50 years of streamflow data recorded preliminary streamflow peaks within the top five for the periods of record. Twelve streamgages recorded preliminary peak streamflows greater than an estimate of the 100-year streamflow based on drainage area. Introduction The flood of October 30–31, 2017 was the result of frequent and abundant rainfall over the same geographic area for an extended period. On October 24–27, 2017, a storm produced rainfall over most of Maine and New Hampshire, saturating soils and decreasing infiltration capacities. A substantial and rapid drop in air pressure on October 29–30, 2017, referred to as a bombogenesis, produced damaging winds and large amounts of rainfall. The additional rainfall and associated runoff produced flooding across parts of New Hampshire and western Maine. Most of this rain fell in a 12-hour period and was in addition to 4 to 8 inches of rain that fell the week before. The U.S. Geological Survey (USGS), in cooperation with Federal, State, and local agencies, collects water resources data at streamgages in Maine and New Hampshire each year. These data are valuable for developing an improved understanding of the water resources of the United States. To make these data readily available to interested parties outside the USGS, preliminary stage and streamflow data at continuous record streamgages are available in near real-time through the USGS National Water Information System (NWIS; U.S. Geological Survey, 2017). Preliminary data are provisional and subject to revision until they have been fully reviewed and received final approval. Publication of the final streamflow data is done through NWIS following further analysis of the hydraulic characteristics and the stability of those characteristics at each streamgage. The purpose of this report is to provide preliminary information documenting the peak stages and streamflows for select rivers and streams in Maine and New Hampshire that are part

Preliminary stage and streamflow data at selected U.S. Geological Survey streamgages in Maine and New Hampshire for the flood of October 30–31, 2017