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Merrimack River at Concord — water level right now

Merrimack County, New Hampshire · NWS gauge CONN3
Loading the latest reading…
–
current stage (ft)
 
14
minor flood stage
 
26.2
record crest
set 1936-03-20
–
flood status
official NWS category
Official NOAA forecast → USGS data → Full US flood map →

Flood stages at this gauge

Where the water stands right now against the four official thresholds:

action · 12
minor · 14
moderate · 17
major · 20
Flood stageLevel (ft)What it means
Major flood stage20extensive inundation and significant evacuations — a serious event
Moderate flood stage17some buildings and roads inundated; evacuations possible
Minor flood stage14low-lying roads and fields near the river start to flood
Action stage12water is approaching flood level — time to pay attention

Highest floods on record here

#Crest (ft)Datevs. minor flood stage
126.21936-03-20+12.2 above
2231938-09-22+9 above
320.81927-11-05+6.8 above
415.122006-05-15+1.12 above
514.651960-04-06+0.65 above
614.41951-04-04+0.4 above
714.281969-04-19+0.28 above
813.691953-03-280.31 below
913.631998-03-310.37 below
1013.411987-03-030.59 below
1113.281999-09-180.72 below
1213.031973-12-230.97 below

Historic crests recorded at this gauge by the National Weather Service — the 12 highest on file.

Where this gauge is

The marker is this gauge; nearby gauges load live and are clickable.

Nearby river gauges

Contoocook River at River Hill 5 mi away · loading… Suncook River at North Chichester 9 mi away · loading… Warner River at Davisville 11 mi away · loading… Piscataquog River at Goffstown 13 mi away · loading… Merrimack River at Franklin Jct. 16 mi away · loading… Winnipesaukee River at Tilton 16 mi away · loading…

Gauge details

NWS gauge IDCONN3
USGS site01088400
CountyMerrimack
StateNew Hampshire
NWS forecast officeGray
River forecast centerNortheast River Forecast Center
Coordinates43.209, -71.53
Time zoneEST5EDT
Turn Around, Don't Drown. Six inches of moving water can knock you off your feet and twelve inches can float a car. Never drive around barricades or into water of unknown depth — most flood deaths happen in vehicles.

Questions about Merrimack River at Concord

Is Merrimack River at Concord flooding right now?

The live reading at the top of this page answers that: the gauge is compared against its official NWS flood stages every 15 minutes. Minor flooding at this gauge begins at 14 ft. Blue means normal, yellow is action stage, orange minor, red moderate and dark red major flooding.

What is flood stage for Merrimack River at Concord?

major flood stage 20 ft, moderate flood stage 17 ft, minor flood stage 14 ft, action stage 12 ft. These are official National Weather Service thresholds set specifically for this gauge, not generic values.

What is the record flood at Merrimack River at Concord?

The highest crest on file at this gauge is 26.2 ft, reached on 1936-03-20 — that is 12.2 ft above minor flood stage. The full list of the highest crests is in the table on this page.

Where does this data come from?

From the NOAA National Water Prediction Service, the official U.S. river gauge network — a U.S. government work in the public domain. Live stage is refreshed every 15 minutes; flood thresholds and historic crests are refreshed monthly. For life-safety decisions follow NWS Gray and local emergency management.