Squannacook River at West Groton

1. 9.00 ftThis is a serious flood event. Widespread flooding is expected along the river through Townsend, Shirley and Groton. Small brooks and tributaries trying to flow into the Squannacook will experience flooding as well. Some road closures may be needed. If asked to evacuate, do so immediately. Follow the directions of emergency management officials.
2. 8.50 ftFlooding will affect portions of Townsend and Groton. Areas along Turnpike and Barker Hill Roads and along Squannacook Terrace should expect flooding. In addition, flooding also occurs on several access roads to the Townsend State Forest.
3. 8.00 ftMinor flooding is expected in lower lying sections of Townsend including the farming areas along Turnpike and Barker Hill roads. Flooding may also spread into low lying areas along Squannacook Terrace.
4. 7.50 ftMinor flooding affects the lowest lying sections of Townsend, including the farmland along Turnpike and Barker Hill roads.

Chance of flooding, September to November

The three-month chances are the River Forecast Centers’ long-range flood outlook, issued September 21, 2026.

Most recent crests

• September 19, 2018: 6.90 ft
• March 31, 2014: 6.15 ft
• March 8, 2011: 7.21 ft
• March 31, 2010: 7.56 ft
• March 15, 2010: 8.03 ft
• February 26, 2010: 7.31 ft
• July 3, 2009: 6.27 ft
• March 9, 2008: 6.00 ft
• April 17, 2007: 8.50 ft
• May 15, 2006: 7.07 ft

• Nashua River at East Pepperell
• North Nashua River at Fitchburg
• North Nashua River
• Merrimack River at Nashua
• Souhegan River at Milford
• Nashua River
• Stillwater River
• Souhegan River at Merrimack

Forecasts by the Northeast River Forecast Center. Forecasts are issued routinely year-round. Gauge reading may be affected by ice. Forecast flows are unadjusted for ice.

Stage, flood stages, impacts and crest history from NOAA’s National Water Prediction Service. Streamflow and the daily record from the U.S. Geological Survey.