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Squannacook River at West Groton

Highest listed crest 8.50 ftFlood stage 7.0 ft41 crests since 1951

The Squannacook River at West Groton crested above flood stage 17 times among the 41 crests the National Weather Service lists from 1951 to 2018. The highest, 8.50 ft on April 17, 2007, was moderate flooding, 1.50 feet above flood stage.

The gauge

Highest listed crest
8.50 ft
April 17, 2007; 4,820 cubic feet per second
Flood stage
7.0 ft
Major flooding from 9.5 ft
Crests at major
0
17 above flood stage
Most recent flood crest
March 8, 2011
7.21 ft, minor flooding
Location
Middlesex County
Near Fitchburg (8.3 mi), Leominster (9.7 mi), Nashua (11.6 mi)

Flood stages

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

Flood categories, Squannacook River at West Groton
Action stage6.024Sep 19, 2018The level at which the NWS or its partners begin to take action
Flood stage (minor)7.016Mar 8, 2011Minimal or no property damage, but possibly some public threat
Moderate flood stage8.51Apr 17, 2007Some inundation of structures and roads near the stream
Major flood stage9.50—Extensive inundation of structures and roads

Every listed crest

41 crests from 1951 to 2018. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Squannacook River at West Groton, 1951 to 2018 678910ft Flood stage 7.0 ftMajor 9.5 ft Feb 19, 1951: 6.03 ft, action stage; 1,440 cubic feet per secondMar 16, 1953: 6.52 ft, action stage; 1,840 cubic feet per secondSep 12, 1954: 7.00 ft, minor flooding; 2,480 cubic feet per secondOct 16, 1955: 8.04 ft, minor flooding; 4,010 cubic feet per secondJan 10, 1956: 7.32 ft, minor flooding; 2,900 cubic feet per secondApr 3, 1959: 6.58 ft, action stage; 2,000 cubic feet per secondApr 6, 1960: 6.70 ft, action stage; 2,120 cubic feet per secondApr 2, 1962: 6.88 ft, action stage; 2,340 cubic feet per secondMar 19, 1968: 6.82 ft, action stage; 2,260 cubic feet per secondFeb 11, 1970: 6.39 ft, action stage; 1,810 cubic feet per secondApr 2, 1973: 6.16 ft, action stage; 1,580 cubic feet per secondDec 22, 1973: 6.13 ft, action stage; 1,560 cubic feet per secondApr 4, 1975: 6.07 ft, action stage; 1,500 cubic feet per secondMar 14, 1977: 7.22 ft, minor flooding; 2,760 cubic feet per secondMar 7, 1979: 6.79 ft, action stage; 2,230 cubic feet per secondMar 22, 1980: 6.33 ft, action stage; 1,750 cubic feet per secondJun 6, 1982: 6.48 ft, action stage; 1,900 cubic feet per secondMar 20, 1983: 7.41 ft, minor flooding; 3,020 cubic feet per secondApr 6, 1984: 7.21 ft, minor flooding; 2,750 cubic feet per secondJan 27, 1986: 6.63 ft, action stage; 2,060 cubic feet per secondApr 1, 1987: 7.30 ft, minor flooding; 2,870 cubic feet per secondApr 6, 1987: 8.16 ft, minor flooding; 4,220 cubic feet per secondMar 30, 1993: 6.57 ft, action stage; 1,990 cubic feet per secondDec 25, 1994: 6.06 ft, action stage; 1,490 cubic feet per secondApr 17, 1996: 7.46 ft, minor flooding; 3,090 cubic feet per secondOct 21, 1996: 7.62 ft, minor flooding; 3,330 cubic feet per secondMar 10, 1998: 6.93 ft, action stage; 2,400 cubic feet per secondMar 23, 2001: 6.17 ft, action stage; 1,590 cubic feet per secondApr 2, 2004: 8.07 ft, minor flooding; 4,060 cubic feet per secondApr 3, 2005: 6.53 ft, action stage; 1,950 cubic feet per secondOct 16, 2005: 6.70 ft, action stageMay 15, 2006: 7.07 ft, minor flooding; 2,570 cubic feet per secondApr 17, 2007: 8.50 ft, moderate flooding; 4,820 cubic feet per secondMar 9, 2008: 6.00 ft, action stage; 1,440 cubic feet per secondJul 3, 2009: 6.27 ft, action stage; 1,690 cubic feet per secondFeb 26, 2010: 7.31 ft, minor flooding; 2,884 cubic feet per secondMar 15, 2010: 8.03 ft, minor flooding; 3,990 cubic feet per secondMar 31, 2010: 7.56 ft, minor flooding; 3,241 cubic feet per secondMar 8, 2011: 7.21 ft, minor flooding; 2,750 cubic feet per secondMar 31, 2014: 6.15 ft, action stage; 1,570 cubic feet per secondSep 19, 2018: 6.90 ft, action stage; 2,363 cubic feet per second Highest, 8.50 ft, Apr 17, 2007 196019701980199020002010

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Squannacook River at West Groton 1950s: 3 1960s: 0 1970s: 1 1980s: 4 4 1990s: 2 2000s: 3 2010s: 4 1950s1960s1970s1980s1990s2000s2010s
  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, Squannacook River at West Groton
1Apr 17, 20078.50+1.50Moderate4,820
2Apr 6, 19878.16+1.16Minor4,220
3Apr 2, 20048.07+1.07Minor4,060
4Oct 16, 19558.04+1.04Minor4,010
5Mar 15, 20108.03+1.03Minor3,990
6Oct 21, 19967.62+0.62Minor3,330
7Mar 31, 20107.56+0.56Minor3,241
8Apr 17, 19967.46+0.46Minor3,090
9Mar 20, 19837.41+0.41Minor3,020
10Jan 10, 19567.32+0.32Minor2,900
11Feb 26, 20107.31+0.31Minor2,884
12Apr 1, 19877.30+0.30Minor2,870
13Mar 14, 19777.22+0.22Minor2,760
14Apr 6, 19847.21+0.21Minor2,750
15Mar 8, 20117.21+0.21Minor2,750
16May 15, 20067.07+0.07Minor2,570
17Sep 12, 19547.000.00Minor2,480
18Mar 10, 19986.93−0.07Action2,400
19Sep 19, 20186.90−0.10Action2,363
20Apr 2, 19626.88−0.12Action2,340
21Mar 19, 19686.82−0.18Action2,260
22Mar 7, 19796.79−0.21Action2,230
23Apr 6, 19606.70−0.30Action2,120
24Oct 16, 20056.70−0.30Action—
25Jan 27, 19866.63−0.37Action2,060
26Apr 3, 19596.58−0.42Action2,000
27Mar 30, 19936.57−0.43Action1,990
28Apr 3, 20056.53−0.47Action1,950
29Mar 16, 19536.52−0.48Action1,840
30Jun 6, 19826.48−0.52Action1,900
31Feb 11, 19706.39−0.61Action1,810
32Mar 22, 19806.33−0.67Action1,750
33Jul 3, 20096.27−0.73Action1,690
34Mar 23, 20016.17−0.83Action1,590
35Apr 2, 19736.16−0.84Action1,580
36Mar 31, 20146.15−0.85Action1,570
37Dec 22, 19736.13−0.87Action1,560
38Apr 4, 19756.07−0.93Action1,500
39Dec 25, 19946.06−0.94Action1,490
40Feb 19, 19516.03−0.97Action1,440
41Mar 9, 20086.00−1.00Action1,440

Other gauges in Middlesex County

Flood gauges in Middlesex County
Maynard5.08.94 ft, Aug 20, 19556
Waltham5.07.56 ft, Mar 16, 20100
Lowell8.09.74 ft, Mar 17, 20100
Lowell52.068.40 ft, Mar 20, 19365
East Pepperell8.019.10 ft, Mar 20, 19363
Wilmington7.010.54 ft, Mar 16, 20102
Saxonville10.013.99 ft, Mar 31, 20103

Middlesex County: every hazard · River floods across the country · Massachusetts

NOAA National Water Prediction Service, gauge WGTM3, 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.