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Pemigewasset River at Woodstock

Highest listed crest 16.97 ftFlood stage 9.0 ft49 crests since 1940

The Pemigewasset River at Woodstock crested at major flood stage 2 times among the 49 crests the National Weather Service lists from 1940 to 2026. The highest, 16.97 ft on August 28, 2011, was major flooding, 7.97 feet above flood stage. 1 other gauge on the Pemigewasset River crested above flood stage within a week of it.

The gauge

Highest listed crest
16.97 ft
August 28, 2011; 53,700 cubic feet per second
Flood stage
9.0 ft
Major flooding from 16.0 ft
Crests at major
2
11th of 34 gauges in New Hampshire
Most recent flood crest
March 17, 2026
10.12 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 Woodstock
Action stage6.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)9.042Mar 17, 2026Minimal or no property damage, but possibly some public threat
Moderate flood stage13.05Dec 18, 2023Some inundation of structures and roads near the stream
Major flood stage16.02Aug 28, 2011Extensive inundation of structures and roads

Every listed crest

49 crests from 1940 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Pemigewasset River at Woodstock, 1940 to 2026 81012141618ft Flood stage 9.0 ftMajor 16.0 ft May 3, 1940: 10.25 ft, minor flooding; 15,500 cubic feet per secondNov 9, 1943: 11.03 ft, minor flooding; 17,600 cubic feet per secondOct 2, 1945: 9.86 ft, minor flooding; 12,700 cubic feet per secondJul 23, 1947: 9.03 ft, minor flooding; 9,800 cubic feet per secondApr 1, 1948: 10.05 ft, minor flooding; 13,400 cubic feet per secondApr 20, 1950: 10.23 ft, minor flooding; 14,100 cubic feet per secondNov 26, 1950: 12.05 ft, minor flooding; 22,800 cubic feet per secondJun 1, 1952: 11.19 ft, minor flooding; 18,400 cubic feet per secondMar 27, 1953: 11.65 ft, minor flooding; 20,800 cubic feet per secondSep 11, 1954: 11.40 ft, minor flooding; 19,500 cubic feet per secondDec 21, 1957: 12.43 ft, minor flooding; 24,600 cubic feet per secondOct 24, 1959: 16.13 ft, major flooding; 47,000 cubic feet per secondOct 7, 1962: 9.46 ft, minor flooding; 11,300 cubic feet per secondNov 7, 1963: 9.03 ft, minor flooding; 9,780 cubic feet per secondNov 3, 1966: 10.49 ft, minor flooding; 15,200 cubic feet per secondApr 25, 1968: 10.41 ft, minor flooding; 14,800 cubic feet per secondMay 20, 1969: 9.39 ft, minor flooding; 11,000 cubic feet per secondMay 4, 1972: 9.12 ft, minor flooding; 6,870 cubic feet per secondFeb 3, 1973: 11.41 ft, minor flooding; 19,600 cubic feet per secondJun 30, 1973: 13.40 ft, moderate flooding; 29,500 cubic feet per secondDec 21, 1973: 12.64 ft, minor flooding; 25,700 cubic feet per secondApr 1, 1976: 9.52 ft, minor flooding; 11,500 cubic feet per secondOct 21, 1976: 9.29 ft, minor flooding; 10,900 cubic feet per secondOct 9, 1977: 10.08 ft, minor flooding; 13,500 cubic feet per secondApr 11, 1980: 9.50 ft, minor floodingApr 1, 1987: 14.01 ft, moderate flooding; 33,000 cubic feet per secondOct 21, 1989: 9.91 ft, minor flooding; 12,800 cubic feet per secondOct 13, 1990: 9.08 ft, minor flooding; 9,790 cubic feet per secondOct 7, 1991: 9.69 ft, minor flooding; 12,000 cubic feet per secondApr 17, 1993: 10.25 ft, minor flooding; 14,200 cubic feet per secondOct 22, 1995: 14.09 ft, moderate flooding; 33,500 cubic feet per secondOct 21, 1996: 10.48 ft, minor flooding; 15,200 cubic feet per secondJun 14, 1998: 10.15 ft, minor flooding; 13,800 cubic feet per secondSep 17, 1999: 12.18 ft, minor flooding; 23,400 cubic feet per secondApr 9, 2000: 11.95 ft, minor flooding; 21,200 cubic feet per secondDec 17, 2000: 12.11 ft, minor flooding; 21,900 cubic feet per secondApr 14, 2002: 12.40 ft, minor flooding; 23,360 cubic feet per secondAug 10, 2003: 10.35 ft, minor flooding; 14,300 cubic feet per secondDec 18, 2003: 10.75 ft, minor flooding; 15,900 cubic feet per secondApr 24, 2005: 11.62 ft, minor flooding; 19,600 cubic feet per secondAug 28, 2011: 16.97 ft, major flooding; 53,700 cubic feet per secondApr 15, 2014: 12.51 ft, minor flooding; 23,900 cubic feet per secondJul 2, 2017: 11.14 ft, minor flooding; 17,506 cubic feet per secondOct 30, 2017: 13.54 ft, moderate flooding; 29,568 cubic feet per secondDec 24, 2022: 9.99 ft, minor flooding; 13,002 cubic feet per secondMay 1, 2023: 10.01 ft, minor flooding; 13,074 cubic feet per secondDec 18, 2023: 14.56 ft, moderate flooding; 35,900 cubic feet per secondApr 13, 2024: 10.53 ft, minor flooding; 15,018 cubic feet per secondMar 17, 2026: 10.12 ft, minor flooding; 13,475 cubic feet per second Highest, 16.97 ft, Aug 28, 2011 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Pemigewasset River at Woodstock 1940s: 5 1950s: 7 7 1960s: 5 1970s: 7 1980s: 3 1990s: 7 2000s: 6 2010s: 4 2020s: 5 1940s1950s1960s1970s1980s1990s2000s2010s2020s
  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

Highest listed crests, Pemigewasset River at Woodstock
1Aug 28, 201116.97+7.97Major53,700
2Oct 24, 195916.13+7.13Major47,000
3Dec 18, 202314.56+5.56Moderate35,900
4Oct 22, 199514.09+5.09Moderate33,500
5Apr 1, 198714.01+5.01Moderate33,000
6Oct 30, 201713.54+4.54Moderate29,568
7Jun 30, 197313.40+4.40Moderate29,500
8Dec 21, 197312.64+3.64Minor25,700
9Apr 15, 201412.51+3.51Minor23,900
10Dec 21, 195712.43+3.43Minor24,600
11Apr 14, 200212.40+3.40Minor23,360
12Sep 17, 199912.18+3.18Minor23,400
13Dec 17, 200012.11+3.11Minor21,900
14Nov 26, 195012.05+3.05Minor22,800
15Apr 9, 200011.95+2.95Minor21,200
16Mar 27, 195311.65+2.65Minor20,800
17Apr 24, 200511.62+2.62Minor19,600
18Feb 3, 197311.41+2.41Minor19,600
19Sep 11, 195411.40+2.40Minor19,500
20Jun 1, 195211.19+2.19Minor18,400
21Jul 2, 201711.14+2.14Minor17,506
22Nov 9, 194311.03+2.03Minor17,600
23Dec 18, 200310.75+1.75Minor15,900
24Apr 13, 202410.53+1.53Minor15,018
25Nov 3, 196610.49+1.49Minor15,200
26Oct 21, 199610.48+1.48Minor15,200
27Apr 25, 196810.41+1.41Minor14,800
28Aug 10, 200310.35+1.35Minor14,300
29May 3, 194010.25+1.25Minor15,500
30Apr 17, 199310.25+1.25Minor14,200
31Apr 20, 195010.23+1.23Minor14,100
32Jun 14, 199810.15+1.15Minor13,800
33Mar 17, 202610.12+1.12Minor13,475
34Oct 9, 197710.08+1.08Minor13,500
35Apr 1, 194810.05+1.05Minor13,400
36May 1, 202310.01+1.01Minor13,074
37Dec 24, 20229.99+0.99Minor13,002
38Oct 21, 19899.91+0.91Minor12,800
39Oct 2, 19459.86+0.86Minor12,700
40Oct 7, 19919.69+0.69Minor12,000
41Apr 1, 19769.52+0.52Minor11,500
42Apr 11, 19809.50+0.50Minor—
43Oct 7, 19629.46+0.46Minor11,300
44May 20, 19699.39+0.39Minor11,000
45Oct 21, 19769.29+0.29Minor10,900
46May 4, 19729.12+0.12Minor6,870
47Oct 13, 19909.08+0.08Minor9,790
48Jul 23, 19479.03+0.03Minor9,800
49Nov 7, 19639.03+0.03Minor9,780

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.

August 28, 2011: 16.97 ft here, major flooding

  • PlymouthNH · Aug 29, 2011 · 21.69 ft · Major

October 24, 1959: 16.13 ft here, major flooding

  • PlymouthNH · Oct 25, 1959 · 22.68 ft · Major

December 18, 2023: 14.56 ft here, moderate flooding

  • PlymouthNH · Dec 19, 2023 · 20.58 ft · Moderate

Gauges on the Pemigewasset River

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

Flood gauges on the Pemigewasset River
Woodstock this gaugeNH9.016.97 ft, Aug 28, 20112
PlymouthNH13.029.00 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
Plymouth13.029.00 ft, Mar 19, 19368

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

NOAA National Water Prediction Service, gauge WOON3, 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.