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Upper Ammonoosuc River







UPPER AMMONOOSUC RIVER

RIVER LEVELS
February 19, 2025


TOTAL RIVER DISCHARGE

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Maximum discharge along the river is currently at the reporting a streamflow rate of cfs. This is also the highest stage along the Upper Ammonoosuc River, with a gauge stage of ft at this location. This river is monitored from 1 different streamgauging stations along the Upper Ammonoosuc River, the highest being situated at an altitude of ft, the .

The Upper Ammonoosuc River is a 21.1-mile-long river located in the White Mountains of New Hampshire, USA. The river has a rich history as it was once used by Native Americans as a major travel route. The river is fed by various tributaries and its flow is controlled by a series of reservoirs and dams, including the Forest Lake Dam and the Stark Dam. These reservoirs help regulate the river’s water levels and provide hydropower for the surrounding communities. The Upper Ammonoosuc River is also used for recreational activities such as fishing, kayaking, and swimming. It is home to various species of fish, including brook trout, rainbow trout, and brown trout. Additionally, the river is used for agricultural purposes, with some farmers using its water for irrigation.

YEAR OVER YEAR DISCHARGE (CFS)

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Streamflow Conditions
Streamgauge Streamflow Gauge Stage 24hr Change (%) % Normal Minimum (cfs) Maximum (cfs) Air Temp Elevation
Upper Ammonoosuc River Near Groveton
USGS 01130000
1560 cfs 3.09 ft 23.81
History of the River
Created with Highcharts 8.0.0Annual Peak Discharge(cfs)

The Upper Ammonoosuc River is a tributary of the Connecticut River that flows through Coös County in northern part of the northeastern U.S. state of New Hampshire. Despite its name, the river is not an upstream portion of the Ammonoosuc River, but instead a separate tributary of the Connecticut River flowing from 20 to 60 miles (32 to 97 km) to the north of the Ammonoosuc.
The Upper Ammonoosuc rises in Pond of Safety in the town of Randolph, runs first generally north through rural portions of Berlin (where it flows through the Godfrey Dam), Milan and a corner of Dummer, then west through Stark and then Northumberland where it drains into the Connecticut near the village of Groveton. The end points of that 42.4-mile (68.2 km) course are approximately 25 air miles (38 km) apart.From Milan to Groveton it is fairly closely paralleled by New Hampshire Route 110.
Fort Wentworth was built in 1755 at the junction of the Upper Ammonoosuc and the Connecticut Rivers (now near the village of Groveton). The fort was used sporadically during both the French and Indian War and the American Revolutionary War.
The watershed area includes the northern Crescent Range, eastern Pliny Range and the eastern and northern Pilot Range, all in the White Mountains. Major tributaries of the Upper Ammonoosuc include:

Nash Stream, rising in the township of Odell,
Phillips Brook, rising in Erving's Location,
the North Branch of the Upper Ammonoosuc, flowing roughly parallel to and east of the main stem (with a ridge between them, that includes Hodgdon Hill and carries NH Rte. 110) in the town of Milan, to join it at West Milan, and
the West Branch of the Upper Ammonoosuc rising on the eastern slope of Mount Cabot in Kilkenny, draining Unknown Pond and York Pond, and joining the main stem below the Godfrey Dam.

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