Souhegan River at Merrimack water level

Name: Souhegan River at Merrimack water level (U.S. Geological Survey)
Creator: U.S. Geological Survey
License: https://www.usgs.gov/information-policies-and-instructions/copyrights-and-credits

River gauge, Souhegan River, New Hampshire, United States

Directions

Below flood stage

Water level

2.81ft Down 0.05 ft over the last 24 hours

Measured Oct 20, 2026, 06:30 PM EDT (30 min ago)

Flow: 124 cfs

History

7 days

Water level Forecast Minor flood stage

The forecast expects the river to fall to 2.60 ft by Friday, October 23 at 08:00 AM. Issued Tuesday, October 20 at 10:49 AM by NOAA National Weather Service.

What this means

The Souhegan River at Merrimack is at 2.81 ft, in the normal range.

It is 6.19 ft below the flood stage of 9.00 ft.

It has dropped 0.05 ft over the past 24 hours. The forecast expects the river to fall to 2.60 ft by Friday, October 23 at 08:00 AM. In the last month it has stayed between 2.81 ft and 3.05 ft.

Judged against the official flood stage for this gauge. How to read levels

Key numbers

Highest on record: 16.20 ftMarch 19, 1936
Forecast peak: 2.80 ftTuesday, October 20 at 02:00 PM

Floating and fishing near Souhegan River at Merrimack

Normal flows mean predictable rapids and good access at most put-ins.

Flood stage here is 9.00 ft, 6.19 ft above the current reading. Beyond it, the National Weather Service also defines moderate and major flood stages.

What happens at each level

13.00 ft: Significant flooding affects homes in the area of Beacon Drive in Merrimack. Other low lying sections upstream into Amherst and Milford experience flooding.
11.00 ft: In Merrimack, homes in the Beacon Drive area flood. Other low lying areas upstream into Amherst and Milford flood.
10.00 ft: In Merrimack, several homes along a small portion of Beacon Drive begin to flood. In Amherst, low lying areas begin to flood.
9.00 ft: Flooding of low lying areas along the river begins in the town of Merrimack.
2.81 ft: Right now

Impact statements from the U.S. National Weather Service.

Highest crests on record

Chance of at least minor flooding in October to December: < 5 %.

Rank	Level	Date
1	16.20 ft	March 19, 1936
2	12.78 ft	September 21, 1938
3	12.71 ft	April 17, 2007
4	11.82 ft	April 8, 1924
5	10.88 ft	June 25, 1944
6	10.66 ft	April 13, 1934
7	10.60 ft	March 13, 1936
8	10.30 ft	October 16, 1955
9	10.25 ft	April 7, 1987
10	10.00 ft	January 10, 1956

Weather at the gauge

The forecast is not available right now.

Sunrise 07:06 AM Sunset 05:57 PM Daylight 10 hr, 51 min Waxing gibbous 72%

Map

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Merrimack River near Goffs Falls, below ManchesterRiver gauge, Merrimack River	4.01 ft	Below flood stage	−0.41 ft	7 mi
Merrimack River at NashuaRiver gauge, Merrimack River	4.89 ft	Below flood stage	−0.09 ft	7 mi
Beaver Brook at North PelhamRiver gauge, Beaver Brook	22.1 cfs	Normal	−0.7 cfs	9 mi
Souhegan River (Site Wlr-1) near MilfordRiver gauge, Souhegan River (Site Wlr-1)	3.53 ft	Below flood stage	−0.19 ft	10 mi
Piscataquog River near GoffstownRiver gauge, Piscataquog River	3.72 ft	Below flood stage	−0.10 ft	11 mi
South Branch Piscataquog River near GoffstownRiver gauge, South Branch Piscataquog River	24.1 cfs	Normal	−3.3 cfs	13 mi
Nashua River at East PepperellRiver gauge, Nashua River	1.53 ft	Below flood stage	−0.53 ft	14 mi
Spicket River at North SalemRiver gauge, Spicket River	82.9 cfs	Very low	±0	15 mi

Questions and answers

What is flood stage for the Souhegan River at Merrimack?

The official flood stage is 9.00 ft. The level is currently 6.19 ft below it.

Is gage height the same as water depth?

No. Gage height is measured from a fixed reference point chosen by the agency, so a reading of 10 ft does not mean the river is 10 ft deep.

What is the water level of Souhegan River at Merrimack today?

On Oct 20, 2026, 06:30 PM EDT, the water level was 2.81 ft. Down 0.05 ft over the last 24 hours.

Is Souhegan River at Merrimack rising or falling?

Down 0.05 ft over the last 24 hours.

Is the level of Souhegan River at Merrimack normal?

Below flood stage. Judged against the official flood stage for this gauge.

What is the highest water level ever recorded at Souhegan River at Merrimack?

The highest level on record is 16.20 ft on March 19, 1936.

Is Souhegan River at Merrimack expected to rise?

The forecast expects the river to fall to 2.60 ft by Friday, October 23 at 08:00 AM.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01094000 (Agency page)
Coordinates: 42.85759, -71.50618 (WGS84)
Vertical datum: NAVD88
Update interval: every 15 minutes
Licence: Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision

Published series

Parameter	Last value	Time (UTC)	Quality
Water level	2.81 ft	2026-10-20 22:30	Provisional
Flow	124 cfs	2026-10-20 22:30	Provisional

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How to cite

U.S. Geological Survey: Souhegan River at Merrimack (usgs:01094000). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/new-hampshire/souhegan-river-at-merrimack

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.

Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer