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Pemigewasset River at Plymouth

Highest listed crest 29.00 ftFlood stage 13.0 ft66 crests since 1907

The Pemigewasset River at Plymouth crested at major flood stage 8 times among the 66 crests the National Weather Service lists from 1907 to 2024. The highest, 29.00 ft on March 19, 1936, was major flooding, 16.00 feet above flood stage.

The gauge

Highest listed crest
29.00 ft
March 19, 1936; 65,400 cubic feet per second
Flood stage
13.0 ft
Major flooding from 21.0 ft
Crests at major
8
1st of 34 gauges in New Hampshire
Most recent flood crest
April 13, 2024
16.08 ft, minor flooding
Location
Grafton County
New Hampshire

Flood stages

The thresholds the National Weather Service uses for this gauge today, and how many listed crests reached each.

Flood categories, Pemigewasset River at Plymouth
Action stage10.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)13.051Apr 13, 2024Minimal or no property damage, but possibly some public threat
Moderate flood stage18.07Dec 19, 2023Some inundation of structures and roads near the stream
Major flood stage21.08Aug 29, 2011Extensive inundation of structures and roads

Every listed crest

66 crests from 1907 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Pemigewasset River at Plymouth, 1907 to 2024 1015202530ft Flood stage 13.0 ftMajor 21.0 ft Dec 10, 1907: 14.00 ft, minor flooding; 22,400 cubic feet per secondApr 14, 1909: 15.20 ft, minor flooding; 25,400 cubic feet per secondMar 28, 1913: 16.00 ft, minor flooding; 27,400 cubic feet per secondApr 20, 1914: 17.50 ft, minor flooding; 31,500 cubic feet per secondOct 31, 1917: 13.10 ft, minor flooding; 20,300 cubic feet per secondApr 14, 1920: 14.10 ft, minor flooding; 22,600 cubic feet per secondApr 12, 1922: 14.90 ft, minor flooding; 24,600 cubic feet per secondApr 29, 1923: 18.60 ft, moderate flooding; 34,600 cubic feet per secondSep 10, 1924: 13.95 ft, minor flooding; 22,300 cubic feet per secondMar 29, 1925: 15.95 ft, minor flooding; 27,300 cubic feet per secondNov 4, 1927: 27.40 ft, major flooding; 60,000 cubic feet per secondMay 3, 1929: 14.21 ft, minor flooding; 22,900 cubic feet per secondApr 8, 1930: 13.14 ft, minor flooding; 20,400 cubic feet per secondApr 13, 1934: 13.88 ft, minor flooding; 22,600 cubic feet per secondJan 10, 1935: 15.20 ft, minor flooding; 17,000 cubic feet per secondMar 19, 1936: 29.00 ft, major flooding; 65,400 cubic feet per secondSep 21, 1938: 23.62 ft, major flooding; 50,900 cubic feet per secondDec 6, 1938: 13.75 ft, minor flooding; 21,900 cubic feet per secondMay 3, 1940: 15.15 ft, minor flooding; 25,400 cubic feet per secondJun 15, 1942: 13.72 ft, minor flooding; 25,500 cubic feet per secondNov 9, 1943: 15.68 ft, minor flooding; 29,300 cubic feet per secondApr 2, 1948: 13.55 ft, minor flooding; 23,400 cubic feet per secondApr 21, 1950: 15.56 ft, minor flooding; 28,000 cubic feet per secondNov 26, 1950: 15.05 ft, minor flooding; 28,300 cubic feet per secondJun 2, 1952: 15.06 ft, minor flooding; 27,400 cubic feet per secondMar 27, 1953: 21.20 ft, major flooding; 44,700 cubic feet per secondSep 12, 1954: 15.43 ft, minor flooding; 29,100 cubic feet per secondDec 21, 1957: 17.15 ft, minor flooding; 33,600 cubic feet per secondOct 25, 1959: 22.68 ft, major flooding; 52,700 cubic feet per secondOct 7, 1962: 13.42 ft, minor flooding; 23,000 cubic feet per secondApr 25, 1968: 13.56 ft, minor flooding; 24,200 cubic feet per secondApr 19, 1969: 14.25 ft, minor flooding; 25,000 cubic feet per secondJul 1, 1973: 22.33 ft, major flooding; 47,600 cubic feet per secondDec 22, 1973: 20.61 ft, moderate floodingApr 2, 1976: 15.55 ft, minor flooding; 28,600 cubic feet per secondMar 14, 1977: 20.06 ft, moderate flooding; 22,000 cubic feet per secondApr 28, 1979: 13.47 ft, minor flooding; 22,400 cubic feet per secondApr 10, 1980: 13.22 ft, minor flooding; 22,000 cubic feet per secondFeb 12, 1981: 20.01 ft, moderate floodingApr 27, 1982: 13.73 ft, minor flooding; 23,000 cubic feet per secondApr 6, 1984: 16.05 ft, minor flooding; 29,500 cubic feet per secondJan 27, 1986: 20.28 ft, moderate floodingApr 1, 1987: 23.43 ft, major flooding; 53,200 cubic feet per secondApr 29, 1988: 15.39 ft, minor flooding; 28,000 cubic feet per secondMay 6, 1989: 14.15 ft, minor flooding; 23,400 cubic feet per secondAug 11, 1990: 13.63 ft, minor flooding; 22,100 cubic feet per secondApr 17, 1993: 15.92 ft, minor flooding; 22,300 cubic feet per secondOct 22, 1995: 15.74 ft, minor flooding; 38,600 cubic feet per secondDec 2, 1996: 14.50 ft, minor flooding; 24,800 cubic feet per secondJun 14, 1998: 14.11 ft, minor flooding; 24,500 cubic feet per secondSep 17, 1999: 14.81 ft, minor flooding; 28,000 cubic feet per secondApr 9, 2000: 16.41 ft, minor flooding; 30,900 cubic feet per secondDec 18, 2000: 15.99 ft, minor flooding; 29,300 cubic feet per secondApr 14, 2002: 14.81 ft, minor flooding; 26,500 cubic feet per secondAug 10, 2003: 13.08 ft, minor flooding; 23,700 cubic feet per secondApr 24, 2005: 14.73 ft, minor flooding; 24,900 cubic feet per secondOct 9, 2005: 14.25 ft, minor flooding; 24,700 cubic feet per secondOct 29, 2006: 13.55 ft, minor flooding; 22,900 cubic feet per secondApr 29, 2008: 13.38 ft, minor flooding; 20,200 cubic feet per secondAug 29, 2011: 21.69 ft, major flooding; 40,208 cubic feet per secondJul 2, 2017: 16.21 ft, minor flooding; 25,117 cubic feet per secondOct 30, 2017: 19.77 ft, moderate flooding; 32,683 cubic feet per secondDec 24, 2022: 15.18 ft, minor flooding; 24,709 cubic feet per secondDec 19, 2023: 20.58 ft, moderate flooding; 39,637 cubic feet per secondMar 7, 2024: 13.85 ft, minor flooding; 21,471 cubic feet per secondApr 13, 2024: 16.08 ft, minor flooding; 27,000 cubic feet per second Highest, 29.00 ft, Mar 19, 1936 192019401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Pemigewasset River at Plymouth 1900s: 2 1910s: 3 1920s: 7 1930s: 6 1940s: 4 1950s: 7 1960s: 3 1970s: 5 1980s: 8 8 1990s: 6 2000s: 8 2010s: 3 2020s: 4 1900s1910s1920s1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s
  1. These are the crests the local National Weather Service office lists for the gauge: the highest on record and recent crests. Lesser floods between them may be missing, so counts by decade are a floor.
  2. Categories use today's flood stages. Levees, dams and channel changes since a crest can make old and new stages not directly comparable.

Highest crests

The 50 highest of 66 listed crests.

Highest listed crests, Pemigewasset River at Plymouth
1Mar 19, 193629.00+16.00Major65,400
2Nov 4, 192727.40+14.40Major60,000
3Sep 21, 193823.62+10.62Major50,900
4Apr 1, 198723.43+10.43Major53,200
5Oct 25, 195922.68+9.68Major52,700
6Jul 1, 197322.33+9.33Major47,600
7Aug 29, 201121.69+8.69Major40,208
8Mar 27, 195321.20+8.20Major44,700
9Dec 22, 197320.61+7.61Moderate—
10Dec 19, 202320.58+7.58Moderate39,637
11Jan 27, 198620.28+7.28Moderate—
12Mar 14, 197720.06+7.06Moderate22,000
13Feb 12, 198120.01+7.01Moderate—
14Oct 30, 201719.77+6.77Moderate32,683
15Apr 29, 192318.60+5.60Moderate34,600
16Apr 20, 191417.50+4.50Minor31,500
17Dec 21, 195717.15+4.15Minor33,600
18Apr 9, 200016.41+3.41Minor30,900
19Jul 2, 201716.21+3.21Minor25,117
20Apr 13, 202416.08+3.08Minor27,000
21Apr 6, 198416.05+3.05Minor29,500
22Mar 28, 191316.00+3.00Minor27,400
23Dec 18, 200015.99+2.99Minor29,300
24Mar 29, 192515.95+2.95Minor27,300
25Apr 17, 199315.92+2.92Minor22,300
26Oct 22, 199515.74+2.74Minor38,600
27Nov 9, 194315.68+2.68Minor29,300
28Apr 21, 195015.56+2.56Minor28,000
29Apr 2, 197615.55+2.55Minor28,600
30Sep 12, 195415.43+2.43Minor29,100
31Apr 29, 198815.39+2.39Minor28,000
32Apr 14, 190915.20+2.20Minor25,400
33Jan 10, 193515.20+2.20Minor17,000
34Dec 24, 202215.18+2.18Minor24,709
35May 3, 194015.15+2.15Minor25,400
36Jun 2, 195215.06+2.06Minor27,400
37Nov 26, 195015.05+2.05Minor28,300
38Apr 12, 192214.90+1.90Minor24,600
39Sep 17, 199914.81+1.81Minor28,000
40Apr 14, 200214.81+1.81Minor26,500
41Apr 24, 200514.73+1.73Minor24,900
42Dec 2, 199614.50+1.50Minor24,800
43Apr 19, 196914.25+1.25Minor25,000
44Oct 9, 200514.25+1.25Minor24,700
45May 3, 192914.21+1.21Minor22,900
46May 6, 198914.15+1.15Minor23,400
47Jun 14, 199814.11+1.11Minor24,500
48Apr 14, 192014.10+1.10Minor22,600
49Dec 10, 190714.00+1.00Minor22,400
50Sep 10, 192413.95+0.95Minor22,300

The worst floods along the Pemigewasset River

For this gauge's highest crests, the other gauges on the Pemigewasset River that crested above flood stage within a week.

April 1, 1987: 23.43 ft here, major flooding

  • WoodstockNH · Apr 1, 1987 · 14.01 ft · Moderate

October 25, 1959: 22.68 ft here, major flooding

  • WoodstockNH · Oct 24, 1959 · 16.13 ft · Major

Gauges on the Pemigewasset River

In USGS station-number order, which runs downstream within a river basin.

Flood gauges on the Pemigewasset River
WoodstockNH9.016.97 ft, Aug 28, 20112
Plymouth this gaugeNH13.029.00 ft, Mar 19, 19368

Other gauges in Grafton County

Flood gauges in Grafton County
Bethlehem8.012.34 ft, Nov 12, 19950
Rumney10.017.40 ft, Nov 3, 19272
Groton9.511.82 ft, Oct 30, 20170
West Lebanon23.035.00 ft, Nov 4, 19274
Woodstock9.016.97 ft, Aug 28, 20112

Grafton County: every hazard · River floods across the country · New Hampshire

NOAA National Water Prediction Service, gauge PLMN3, retrieved October 30, 2026. Stages in feet on the gauge's own datum, not elevation. Crests are as the National Weather Service lists them; preliminary values may be revised.