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Ontonagon River near Rockland

Highest listed crest 28.60 ftFlood stage 25.0 ft85 crests since 1942

The Ontonagon River near Rockland crested at major flood stage 1 time among the 85 crests the National Weather Service lists from 1942 to 2024. The highest, 28.60 ft on August 22, 1942, was major flooding, 3.60 feet above flood stage.

The gauge

Highest listed crest
28.60 ft
August 22, 1942; 42,000 cubic feet per second
Flood stage
25.0 ft
Major flooding from 28.0 ft
Crests at major
1
26th of 98 gauges in Michigan
Most recent flood crest
August 22, 1942
28.60 ft, major flooding
Location
Ontonagon County
Michigan

Flood stages

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

Flood categories, Ontonagon River near Rockland
Action stage23.00—The level at which the NWS or its partners begin to take action
Flood stage (minor)25.00—Minimal or no property damage, but possibly some public threat
Moderate flood stage26.00—Some inundation of structures and roads near the stream
Major flood stage28.01Aug 22, 1942Extensive inundation of structures and roads

Every listed crest

85 crests from 1942 to 2024. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the Ontonagon River near Rockland, 1942 to 2024 1015202530ft Flood stage 25.0 ftMajor 28.0 ft Aug 22, 1942: 28.60 ft, major flooding; 42,000 cubic feet per secondMay 6, 1943: 15.70 ft, below flood stage; 12,600 cubic feet per secondJun 5, 1944: 15.69 ft, below flood stage; 12,600 cubic feet per secondMay 22, 1945: 15.80 ft, below flood stage; 12,800 cubic feet per secondJun 24, 1946: 18.48 ft, below flood stage; 17,600 cubic feet per secondApr 23, 1947: 14.04 ft, below flood stage; 9,900 cubic feet per secondApr 11, 1948: 11.85 ft, below flood stage; 6,600 cubic feet per secondJul 6, 1949: 18.52 ft, below flood stage; 17,900 cubic feet per secondMay 6, 1950: 16.73 ft, below flood stage; 14,700 cubic feet per secondJun 24, 1951: 17.72 ft, below flood stage; 16,500 cubic feet per secondApr 19, 1952: 18.78 ft, below flood stage; 18,400 cubic feet per secondAug 4, 1953: 19.38 ft, below flood stage; 19,500 cubic feet per secondApr 26, 1954: 17.65 ft, below flood stage; 16,300 cubic feet per secondSep 17, 1955: 16.50 ft, below flood stage; 14,300 cubic feet per secondApr 4, 1956: 14.40 ft, below flood stage; 12,000 cubic feet per secondApr 20, 1957: 16.48 ft, below flood stage; 14,300 cubic feet per secondApr 14, 1958: 13.56 ft, below flood stage; 9,460 cubic feet per secondApr 8, 1959: 13.14 ft, below flood stage; 8,830 cubic feet per secondApr 24, 1960: 20.82 ft, below flood stage; 22,400 cubic feet per secondMar 27, 1961: 19.48 ft, below flood stage; 11,800 cubic feet per secondMay 2, 1962: 12.11 ft, below flood stage; 7,520 cubic feet per secondApr 1, 1963: 18.81 ft, below flood stage; 17,700 cubic feet per secondApr 13, 1964: 17.74 ft, below flood stage; 18,500 cubic feet per secondMay 9, 1965: 15.07 ft, below flood stage; 13,300 cubic feet per secondMar 18, 1966: 16.97 ft, below flood stage; 17,800 cubic feet per secondMar 31, 1967: 16.90 ft, below flood stage; 17,600 cubic feet per secondMar 19, 1968: 15.97 ft, below flood stage; 15,400 cubic feet per secondApr 10, 1969: 15.60 ft, below flood stage; 14,600 cubic feet per secondApr 9, 1970: 12.95 ft, below flood stage; 9,350 cubic feet per secondApr 12, 1971: 17.59 ft, below flood stage; 20,000 cubic feet per secondAug 16, 1972: 15.96 ft, below flood stage; 15,400 cubic feet per secondMay 10, 1973: 15.91 ft, below flood stage; 15,300 cubic feet per secondJun 10, 1974: 14.54 ft, below flood stage; 12,500 cubic feet per secondApr 23, 1975: 17.18 ft, below flood stage; 19,000 cubic feet per secondMar 30, 1976: 13.54 ft, below flood stage; 10,600 cubic feet per secondMar 29, 1977: 13.61 ft, below flood stage; 10,700 cubic feet per secondApr 10, 1978: 11.84 ft, below flood stage; 7,800 cubic feet per secondApr 21, 1979: 15.82 ft, below flood stage; 15,100 cubic feet per secondAug 21, 1980: 13.29 ft, below flood stage; 10,600 cubic feet per secondMar 30, 1981: 13.56 ft, below flood stage; 11,100 cubic feet per secondMar 17, 1982: 16.93 ft, below flood stage; 18,500 cubic feet per secondJun 22, 1983: 15.60 ft, below flood stage; 15,600 cubic feet per secondApr 13, 1984: 13.15 ft, below flood stage; 10,300 cubic feet per secondApr 19, 1985: 17.25 ft, below flood stage; 19,300 cubic feet per secondApr 1, 1986: 20.12 ft, below flood stage; 26,400 cubic feet per secondApr 6, 1988: 14.73 ft, below flood stage; 12,800 cubic feet per secondNov 16, 1988: 16.45 ft, below flood stage; 16,800 cubic feet per secondMar 15, 1990: 16.46 ft, below flood stage; 16,800 cubic feet per secondMar 28, 1991: 12.82 ft, below flood stage; 8,940 cubic feet per secondJul 3, 1992: 19.80 ft, below flood stage; 23,900 cubic feet per secondMar 29, 1993: 14.66 ft, below flood stageApr 10, 1993: 12.52 ft, below flood stage; 8,390 cubic feet per secondJun 17, 1994: 13.20 ft, below flood stage; 9,660 cubic feet per secondMar 15, 1995: 16.07 ft, below flood stage; 9,600 cubic feet per secondApr 22, 1996: 17.71 ft, below flood stage; 20,100 cubic feet per secondApr 6, 1997: 16.96 ft, below flood stage; 18,100 cubic feet per secondMar 28, 1998: 16.18 ft, below flood stage; 16,100 cubic feet per secondApr 1, 1999: 14.44 ft, below flood stage; 12,200 cubic feet per secondFeb 27, 2000: 12.50 ft, below flood stage; 8,500 cubic feet per secondApr 8, 2001: 16.65 ft, below flood stage; 17,300 cubic feet per secondApr 17, 2002: 20.34 ft, below flood stage; 27,800 cubic feet per secondMay 12, 2003: 20.90 ft, below flood stage; 29,500 cubic feet per secondApr 19, 2004: 18.57 ft, below flood stage; 22,500 cubic feet per secondApr 6, 2005: 16.00 ft, below flood stage; 15,700 cubic feet per secondApr 1, 2006: 15.20 ft, below flood stage; 13,800 cubic feet per secondMar 26, 2007: 16.35 ft, below flood stage; 16,600 cubic feet per secondApr 7, 2008: 16.12 ft, below flood stageApr 17, 2008: 15.30 ft, below flood stage; 14,100 cubic feet per secondApr 25, 2009: 13.52 ft, below flood stage; 10,300 cubic feet per secondMar 12, 2010: 17.25 ft, below flood stageApr 10, 2011: 12.08 ft, below flood stage; 7,670 cubic feet per secondMar 17, 2012: 12.75 ft, below flood stage; 8,840 cubic feet per secondMay 1, 2013: 21.96 ft, below flood stage; 27,400 cubic feet per secondApr 10, 2014: 16.81 ft, below flood stageMay 9, 2014: 16.78 ft, below flood stage; 16,100 cubic feet per secondMar 17, 2015: 15.64 ft, below flood stageMar 16, 2016: 14.87 ft, below flood stage; 12,200 cubic feet per secondFeb 21, 2017: 19.82 ft, below flood stageJun 18, 2018: 18.32 ft, below flood stage; 19,300 cubic feet per secondApr 23, 2019: 21.13 ft, below flood stage; 26,000 cubic feet per secondMar 30, 2020: 14.23 ft, below flood stage; 10,700 cubic feet per secondMar 22, 2021: 13.62 ft, below flood stage; 9,650 cubic feet per secondApr 14, 2022: 17.39 ft, below flood stage; 17,100 cubic feet per secondApr 13, 2023: 21.64 ft, below flood stage; 27,100 cubic feet per secondJun 23, 2024: 14.41 ft, below flood stage; 11,000 cubic feet per second Highest, 28.60 ft, Aug 22, 1942 1960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, Ontonagon River near Rockland 1940s: 1 1 1950s: 0 1960s: 0 1970s: 0 1980s: 0 1990s: 0 2000s: 0 2010s: 0 2020s: 0 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

The 50 highest of 85 listed crests.

Highest listed crests, Ontonagon River near Rockland
1Aug 22, 194228.60+3.60Major42,000
2May 1, 201321.96−3.04Below flood stage27,400
3Apr 13, 202321.64−3.36Below flood stage27,100
4Apr 23, 201921.13−3.87Below flood stage26,000
5May 12, 200320.90−4.10Below flood stage29,500
6Apr 24, 196020.82−4.18Below flood stage22,400
7Apr 17, 200220.34−4.66Below flood stage27,800
8Apr 1, 198620.12−4.88Below flood stage26,400
9Feb 21, 201719.82−5.18Below flood stage—
10Jul 3, 199219.80−5.20Below flood stage23,900
11Mar 27, 196119.48−5.52Below flood stage11,800
12Aug 4, 195319.38−5.62Below flood stage19,500
13Apr 1, 196318.81−6.19Below flood stage17,700
14Apr 19, 195218.78−6.22Below flood stage18,400
15Apr 19, 200418.57−6.43Below flood stage22,500
16Jul 6, 194918.52−6.48Below flood stage17,900
17Jun 24, 194618.48−6.52Below flood stage17,600
18Jun 18, 201818.32−6.68Below flood stage19,300
19Apr 13, 196417.74−7.26Below flood stage18,500
20Jun 24, 195117.72−7.28Below flood stage16,500
21Apr 22, 199617.71−7.29Below flood stage20,100
22Apr 26, 195417.65−7.35Below flood stage16,300
23Apr 12, 197117.59−7.41Below flood stage20,000
24Apr 14, 202217.39−7.61Below flood stage17,100
25Apr 19, 198517.25−7.75Below flood stage19,300
26Mar 12, 201017.25−7.75Below flood stage—
27Apr 23, 197517.18−7.82Below flood stage19,000
28Mar 18, 196616.97−8.03Below flood stage17,800
29Apr 6, 199716.96−8.04Below flood stage18,100
30Mar 17, 198216.93−8.07Below flood stage18,500
31Mar 31, 196716.90−8.10Below flood stage17,600
32Apr 10, 201416.81−8.19Below flood stage—
33May 9, 201416.78−8.22Below flood stage16,100
34May 6, 195016.73−8.27Below flood stage14,700
35Apr 8, 200116.65−8.35Below flood stage17,300
36Sep 17, 195516.50−8.50Below flood stage14,300
37Apr 20, 195716.48−8.52Below flood stage14,300
38Mar 15, 199016.46−8.54Below flood stage16,800
39Nov 16, 198816.45−8.55Below flood stage16,800
40Mar 26, 200716.35−8.65Below flood stage16,600
41Mar 28, 199816.18−8.82Below flood stage16,100
42Apr 7, 200816.12−8.88Below flood stage—
43Mar 15, 199516.07−8.93Below flood stage9,600
44Apr 6, 200516.00−9.00Below flood stage15,700
45Mar 19, 196815.97−9.03Below flood stage15,400
46Aug 16, 197215.96−9.04Below flood stage15,400
47May 10, 197315.91−9.09Below flood stage15,300
48Apr 21, 197915.82−9.18Below flood stage15,100
49May 22, 194515.80−9.20Below flood stage12,800
50May 6, 194315.70−9.30Below flood stage12,600

Other gauges in Ontonagon County

Flood gauges in Ontonagon County
Ewen33.033.87 ft, Apr 30, 20130

Ontonagon County: every hazard · River floods across the country · Michigan

NOAA National Water Prediction Service, gauge RKLM4, 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.