Connecticut River at Dalton, NH
River level and flood forecast · Coos County
The river is 10.8 ft below flood stage (18 ft).
Forecast to rise to 11.0 ft Wed 2 PM, below the 18 ft flood stage.
Flow: 586 cubic feet per second (USGS).
Much lower than normal for October 13.
Usual for October 13: 973 to 2,460 cubic feet per second (the middle half of 100 years).
The last 7 days and the forecast
NWS forecast issued Mon, Oct 12, 11:14 AM. Forecasts change as rain falls and as upstream water arrives.
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An email when the National Weather Service forecasts Connecticut River at Dalton to flood, when it floods, and when it's over.
Flood stages
| Major flood stage | 23 ft |
| Moderate flood stage | 21 ft |
| Flood stage | 18 ft |
| Action stage | 15 ft |
| Record crest (March 20, 1936) | 25.6 ft |
What floods at each level
From the National Weather Service, highest first.
- 25.6 ftRecord flood comparable to the flood of 1936.
- 25 ftWater reaches US Route 2 Bridge Street in Lancaster, causing major regional travel disruptions. Floodwaters completely isolate several homes.
- 23 ftWater flows over US Route 3 in Lancaster near Industrial Park Road. Water also reaches US Route 2 Bridge Street.
- 22 ftRoute 135 in Dalton is inundated. Homes flood along Route 135 north of the Johns River.
- 21 ftIn Guildhall, VT, Route 102 floods just north of the Route 2 bridge to Lancaster, as well as near Breault Road at the Washburn Brook crossing. In Dalton, Route 135 floods at the public boat launch. Basements flood at a few residences along Route 135 north of the Johns River.
- 20 ftFloodwaters cut off access to a few homes along Route 135 in Lancaster. Several riverside camps along Route 135 north of the Johns River are flooded. River Road is underwater between the Mt. Orne Bridge and South Lunenburg.
- 19 ftBasements of low-lying homes in Dalton and Lancaster are at risk of flooding. Water begins to encroach on Route 135 at the Dalton public boat launch.
- 18 ftWater inundates campgrounds, agricultural fields, and recreational fields off Bridge Street in Lancaster.
- 17 ftMinor lowland flooding begins.
Highest crests on record
- 25.6 ft — March 20, 1936
- 23.7 ft — April 1, 1998
- 23.22 ft — March 19, 1990
- 22.38 ft — March 28, 1953
- 22.25 ft — April 24, 1954
Recent crests: 17.76 ft (July 13, 2024) · 17.86 ft (March 8, 2024) · 17.31 ft (December 20, 2023) · 22.15 ft (April 17, 2014) · 18.18 ft (May 26, 2013)
Highest flow on record
48,300 cubic feet per second — March 20, 1936. From the USGS's yearly peaks since 1928.
Up and down the river, and nearby
- UpstreamConnecticut River at North Stratford, NH
- DownstreamConnecticut River at Wells River, VT
- Moose River at Victory, VT
- Ammonoosuc River at Bethlehem, NH
- Sleepers River near St. Johnsbury, VT
- Passumpsic River at Passumpsic, VT
- East Branch of the Passumpsic River at East Haven, VT
- Upper Ammonoosuc River near Groveton, NH
- Pope Brook (VT) near North Danville, VT
Not an official source. River levels, forecasts, flood stages and impacts are from the National Weather Service (DLTN3); flow from the U.S. Geological Survey. Readings are provisional. In a flood, follow your local officials and the NWS at weather.gov.