Cockermouth River at Groton, NH
River level and flood forecast · Grafton County
The river is 8.2 ft below flood stage (9.5 ft).
Flow: 5 cubic feet per second (USGS).
Normal for October 13.
Usual for October 13: 5 to 17 cubic feet per second (the middle half of 18 years).
The last 7 days and the forecast
NWS forecast issued Sun, Dec 31, 7 PM. Forecasts change as rain falls and as upstream water arrives.
Get flood alerts for this river
An email when the National Weather Service forecasts Cockermouth River at Groton to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 12 ft |
| Moderate flood stage | 10 ft |
| Flood stage | 9.5 ft |
| Action stage | 8.5 ft |
| Record crest (October 30, 2017) | 11.82 ft |
What floods at each level
From the National Weather Service, highest first.
- 12 ftMajor flooding occurs. Comparable to July 2019 flood.
- 10 ftModerate flooding occurs. Sculptured Rocks Road flooded north of Groton.
- 9.5 ftMinor flooding occurs. North Shore Road from Grey Rocks Road to Cross Road flooded in Hebron. Braley Road north of Groton Road also flooded in Hebron.
- 9 ftFlooding occurs in Grey Rocks Conservation area.
Highest crests on record
- 11.82 ft — October 30, 2017
- 11.17 ft — August 28, 2011
- 9.75 ft — December 23, 2022
- 9.25 ft — December 18, 2023
Recent crests: 9.25 ft (December 18, 2023) · 9.75 ft (December 23, 2022) · 11.82 ft (October 30, 2017) · 11.17 ft (August 28, 2011)
Highest flow on record
8,920 cubic feet per second — July 12, 2019. From the USGS's yearly peaks since 2008.
Up and down the river, and nearby
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (GRTN3); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.