Ashuelot River River Levels

Last Updated: January 2, 2026

The Ashuelot River is a 64-mile-long river in southwestern New Hampshire.


Summary

Total streamflow across the Ashuelot River was last observed at 1,138 cfs, and is expected to yield approximately 2,257 acre-ft of water today; about 49% of normal. River levels are low and may signify a drought. Average streamflow for this time of year is 2,313 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 West Swanzey reporting a streamflow rate of 621 cfs. However, the streamgauge with the highest stage along the river is the Ashuelot River Above The Branch with a gauge stage of 66.71 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.

River Details

Last Updated 2026-01-02
Discharge Volume 2,257 ACRE-FT
Streamflow 1,138.0 cfs
+31.0 cfs (+2.8%)
Percent of Normal 49.21%
Maximum 11,380.0 cfs
2021-07-20
Seasonal Avg 2,313 cfs
       
River Streamflow Levels
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Ashuelot River Near Gilsum
USGS 01157000
517 cfs 4.93 ft 16.7
Ashuelot River Below Surry Mt Dam
USGS 01158000
271 cfs 6.17 ft 0
Ashuelot River Above The Branch
USGS 01158110
21 cfs 66.71 ft -43.4
Ashuelot River At West Swanzey
USGS 01160350
621 cfs 6.98 ft -6.48
Ashuelot River At Hinsdale
USGS 01161000
225 cfs 5.26 ft 38.89
Seasonal Discharge Comparison
Maximum Streamflow Discharge
Streamflow Elevation Profile

The Ashuelot River is a tributary of the Connecticut River, approximately 64 miles (103 km) long, in southwestern New Hampshire in the United States. It drains a mountainous area of 425 square miles (1,101 km2), including much of the area known as the Monadnock Region. It is the longest tributary of the Connecticut River within New Hampshire.