NEW HAMPSHIRE FLOW REPORT
Last Updated: December 21, 2025
In New Hampshire, the state's rivers are currently exhibiting varied streamflow conditions, with several locations reporting lower than average flows, indicative of potential flow droughts. For example, the Androscoggin River at both Gorham and Errol displays flows at 44.57% and 51.34% below normal, respectively. The Diamond River near Wentworth Location is also significantly below its normal flow, registering a 59.98% deficit. Conversely, the Upper Ammonoosuc River near Groveton is over normal flows by 108.64%, potentially signaling flood risks in the surrounding areas. Water enthusiasts should note the abnormally high streamflow increase in the Ammonoosuc River at Bethlehem Junction, with a 140.97% change in the last 24 hours, which could impact recreational activities.
The Merrimack River, a major watershed, is experiencing varied conditions; near Goffs Falls, it has seen a substantial 100.52% increase in flow over the last day, though still 50.24% below normal, which may affect cities like Merrimack and Franklin Junction. While the Pemigewasset River at Plymouth is 45.32% above normal flow, leading to a higher gage height of 6.44 feet, it could impact whitewater trails and local communities. The Connecticut River, vital to the state, shows a decreased streamflow at North Stratford by -0.56% and a significant change at North Walpole, with a 57.75% increase in the last 24 hours. This could affect cities along the river like Claremont and Lebanon, where water levels are currently close to normal. Recreational users, particularly those interested in whitewater activities, should exercise caution and stay informed about the rapidly changing conditions on rivers like the Ammonoosuc, Connecticut, and Merrimack.
New Hampshire has a humid continental climate with cold winters and warm, humid summers. Major surface flows include the Connecticut River, which forms the western border of the state, and the Merrimack River, which flows through the central part of the state. The Pemigewasset, Saco, and Androscoggin Rivers are also significant. There are numerous reservoirs and dams in the state, including the Amoskeag Dam on the Merrimack River. Hydrology in New Hampshire is influenced by precipitation patterns, which vary widely across the state. Snowpack in the winter months is a major source of water for rivers and streams in the spring and summer. The state's many watersheds, including the Connecticut River watershed, play a critical role in determining flow conditions.
Explore Rivers
- Ammonoosuc River
- Androscoggin River
- Ashuelot River
- Baker River
- Bearcamp River
- Blackwater River
- Cocheco River
- Connecticut River
- Contoocook River
- Diamond River
- Exeter River
- Isinglass River
- Lamprey River
- Merrimack River
- North Branch River
- Oyster River
- Pemigewasset River
- Piscataquog River
- Saco River
- Smith River
- Souhegan River
- Spicket River
- Sugar River
- Suncook River
- Upper Ammonoosuc River
- Warner River
- Winnicut River
- Winnipesaukee River