Merrimack River at Concord water level

Name: Merrimack River at Concord 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, Merrimack River, New Hampshire, United States

Directions

Below flood stage

Water level

3.93ft Down 0.15 ft over the last 24 hours

Measured Oct 20, 2026, 08:30 AM EDT (1 hour ago)

History

7 days

Water level Minor flood stage

What this means

The gauge at Merrimack River at Concord reads 3.93 ft, a normal level.

It is 10.07 ft below the flood stage of 14.00 ft.

The level is falling, down 0.15 ft over the past 24 hours. Over the past 30 days it has moved between 3.14 ft and 4.49 ft.

Fall is often low-water season on rivers, until steadier rain returns.

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

Key numbers

Highest on record: 26.20 ftMarch 20, 1936

What the stage means on the water

A normal level is usually prime time for floating and wade fishing, as long as the weather holds upstream.

The National Weather Service puts flood stage for this gauge at 14.00 ft, still 10.07 ft away.

What happens at each level

18.00 ft: Flooding occurs at businesses near the ice arena parking lot.
16.00 ft: The parking lot on the east bank downstream of the Route 9 bridge floods.
14.00 ft: Lowland flooding occurs.
12.00 ft: Minor lowland flooding begins.
3.93 ft: Right now

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

Highest crests on record

Rank	Level	Date
1	26.20 ft	March 20, 1936
2	23.00 ft	September 22, 1938
3	20.80 ft	November 5, 1927
4	15.12 ft	May 15, 2006
5	14.40 ft	April 4, 1951
6	14.28 ft	April 19, 1969
7	13.69 ft	March 28, 1953
8	13.63 ft	March 31, 1998
9	13.41 ft	March 3, 1987
10	13.28 ft	September 18, 1999

Weather at the gauge

The forecast is not available right now.

Sunrise 07:06 AM Sunset 05:57 PM Daylight 10 hr, 50 min First quarter 68%

Map

Other gauges on the Merrimack River

Gauge	Level	Compared with normal	24 hours	Distance
Merrimack River at Franklin JunctionRiver gauge, Merrimack River	4.43 ft	Below flood stage	−0.44 ft	16 mi
Merrimack River near Goffs Falls, below ManchesterRiver gauge, Merrimack River	3.98 ft	Below flood stage	−0.44 ft	18 mi
Merrimack River at NashuaRiver gauge, Merrimack River	4.76 ft	Below flood stage	+0.01 ft	31 mi
Merrimack River below Concord River at LowellRiver gauge, Merrimack River	42.55 ft	Below flood stage	−0.31 ft	41 mi
Merrimack River at LawrenceRiver gauge, Merrimack River	10.08 ft	Normal	−0.58 ft	40 mi
Merrimack River at NewburyportEstuary gauge, Merrimack River	2.34 ft	Very high	+1.17 ft	43 mi

Nearby gauges

Gauge	Level	Compared with normal	24 hours	Distance
Suncook River at North ChichesterRiver gauge, Suncook River	3.55 ft	Below flood stage	+0.15 ft	9 mi
Blackwater River near WebsterRiver gauge, Blackwater River	69.6 cfs	Normal	−10.8 cfs	10 mi
Piscataquog River below Everett Dam, near E WeareRiver gauge, Piscataquog River	31.7 cfs	Low	+1.7 cfs	10 mi
Warner River at DavisvilleRiver gauge, Warner River	3.65 ft	Below flood stage	−0.15 ft	11 mi
Contoocook River below Hopkinton Dam at W HopkintonRiver gauge, Contoocook River	325 cfs	Normal	−217.0 cfs	11 mi
Piscataquog River near GoffstownRiver gauge, Piscataquog River	3.35 ft	Below flood stage	−0.55 ft	13 mi
South Branch Piscataquog River near GoffstownRiver gauge, South Branch Piscataquog River	25.7 cfs	Normal	−2.5 cfs	15 mi
Winnipesaukee River at TiltonRiver gauge, Winnipesaukee River	2.81 ft	Below flood stage	−0.18 ft	16 mi

Questions and answers

What is flood stage for the Merrimack River at Concord?

The official flood stage is 14.00 ft. The level is currently 10.07 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 Merrimack River at Concord today?

On Oct 20, 2026, 08:30 AM EDT, the water level was 3.93 ft. Down 0.15 ft over the last 24 hours.

Is Merrimack River at Concord rising or falling?

Down 0.15 ft over the last 24 hours.

Is the level of Merrimack River at Concord normal?

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

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

The highest level on record is 26.20 ft on March 20, 1936.

How often is this data updated?

The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads

Operator: U.S. Geological Survey
Station code: usgs:01088400 (Agency page)
Coordinates: 43.20886, -71.53030 (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	3.93 ft	2026-10-20 12:30	Provisional

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How to cite

U.S. Geological Survey: Merrimack River at Concord (usgs:01088400). Accessed October 20, 2026 via Nivelmap, https://nivelmap.com/en/united-states/new-hampshire/merrimack-river-at-concord

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