Total streamflow across the Ashuelot River was last observed at 2,467 cfs, and is expected to yield approximately 4,893 acre-ft of water today; about 110% of normal. Average streamflow for this time of year is 2,237 cfs, with recent peaks last observed on 2021-07-20 when daily discharge volume was observed at 11,380 cfs.

Maximum discharge along the river is currently at the Ashuelot River At Hinsdale reporting a streamflow rate of 984 cfs. However, the streamgauge with the highest stage along the river is the Ashuelot River Above The Branch with a gauge stage of 66.98 ft. This river is monitored from 5 different streamgauging stations along the Ashuelot River, the highest being situated at an altitude of 810 ft, the Ashuelot River Near Gilsum.

The Ashuelot River is a 64-mile-long river in southwestern New Hampshire. The river flows through several towns, including Ashuelot, Winchester, Hinsdale, and Swanzey. The river's hydrology is largely influenced by the many dams and reservoirs along its length. The two largest reservoirs are the Highland Lake and the Surry Mountain Lake. The river has historically been used for water-powered mills, and today it is used for hydroelectric power generation. Additionally, the river provides opportunities for recreational activities such as fishing, canoeing, and kayaking. The river is also used for agricultural irrigation in some areas. The Ashuelot River is an important natural resource for the region and is home to a variety of fish species, including trout, smallmouth bass, and walleye.