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St. Marys River at Moniac

Highest listed crest 22.98 ftFlood stage 12.0 ft165 crests since 1921

The St. Marys River at Moniac crested at major flood stage 9 times among the 165 crests the National Weather Service lists from 1921 to 2025. The highest, 22.98 ft on April 5, 1973, was major flooding, 10.98 feet above flood stage. 1 other gauge on the St. Marys River crested above flood stage within a week of it.

The gauge

Highest listed crest
22.98 ft
April 5, 1973; 11,600 cubic feet per second
Flood stage
12.0 ft
Major flooding from 17.0 ft
Crests at major
9
17th of 237 gauges in Florida
Most recent flood crest
March 12, 2025
12.08 ft, minor flooding
Location
Baker County
Florida

Flood stages

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

Flood categories, St. Marys River at Moniac
Action stage10.070Mar 19, 2014The level at which the NWS or its partners begin to take action
Flood stage (minor)12.075Mar 12, 2025Minimal or no property damage, but possibly some public threat
Moderate flood stage15.09Aug 7, 2021Some inundation of structures and roads near the stream
Major flood stage17.09Sep 13, 2017Extensive inundation of structures and roads

Every listed crest

165 crests from 1921 to 2025. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the St. Marys River at Moniac, 1921 to 2025 510152025ft Flood stage 12.0 ftMajor 17.0 ft Jul 31, 1921: 14.54 ft, minor flooding; 2,200 cubic feet per secondJul 23, 1927: 11.41 ft, action stage; 1,100 cubic feet per secondApr 11, 1928: 11.57 ft, action stage; 1,180 cubic feet per secondApr 16, 1928: 12.36 ft, minor flooding; 1,480 cubic feet per secondApr 28, 1928: 12.12 ft, minor flooding; 1,380 cubic feet per secondJul 12, 1928: 12.74 ft, minor flooding; 1,660 cubic feet per secondSep 19, 1928: 19.90 ft, major flooding; 6,060 cubic feet per secondMar 17, 1929: 12.57 ft, minor flooding; 1,610 cubic feet per secondMay 9, 1929: 11.42 ft, action stage; 1,100 cubic feet per secondAug 28, 1929: 11.52 ft, action stage; 1,140 cubic feet per secondOct 2, 1929: 14.70 ft, minor flooding; 2,640 cubic feet per secondMar 25, 1930: 13.07 ft, minor flooding; 1,790 cubic feet per secondSep 16, 1932: 13.42 ft, minor flooding; 1,870 cubic feet per secondFeb 9, 1933: 13.11 ft, minor flooding; 1,770 cubic feet per secondMar 21, 1933: 11.47 ft, action stage; 1,050 cubic feet per secondApr 16, 1933: 11.22 ft, action stage; 1,090 cubic feet per secondOct 22, 1950: 16.20 ft, moderate flooding; 4,050 cubic feet per secondMar 14, 1952: 12.36 ft, minor flooding; 1,330 cubic feet per secondOct 1, 1953: 14.27 ft, minor flooding; 2,140 cubic feet per secondDec 31, 1953: 11.49 ft, action stage; 855 cubic feet per secondJun 11, 1957: 15.26 ft, moderate flooding; 3,110 cubic feet per secondOct 3, 1957: 11.78 ft, action stage; 974 cubic feet per secondApr 11, 1958: 13.38 ft, minor flooding; 1,590 cubic feet per secondMar 7, 1959: 13.82 ft, minor flooding; 1,830 cubic feet per secondMar 18, 1959: 14.80 ft, minor flooding; 2,650 cubic feet per secondMay 25, 1959: 11.38 ft, action stage; 765 cubic feet per secondJul 17, 1959: 12.00 ft, minor flooding; 981 cubic feet per secondFeb 26, 1960: 11.28 ft, action stage; 733 cubic feet per secondMar 19, 1960: 13.00 ft, minor flooding; 1,410 cubic feet per secondJun 21, 1960: 11.01 ft, action stage; 705 cubic feet per secondJul 12, 1960: 11.36 ft, action stage; 821 cubic feet per secondApr 2, 1962: 14.88 ft, minor flooding; 2,730 cubic feet per secondJan 14, 1963: 11.18 ft, action stage; 729 cubic feet per secondJan 13, 1964: 12.47 ft, minor flooding; 1,160 cubic feet per secondFeb 29, 1964: 13.40 ft, minor flooding; 1,560 cubic feet per secondMay 4, 1964: 15.36 ft, moderate flooding; 2,730 cubic feet per secondJul 28, 1964: 11.04 ft, action stage; 687 cubic feet per secondAug 30, 1964: 13.09 ft, minor flooding; 1,400 cubic feet per secondSep 13, 1964: 18.41 ft, major flooding; 4,590 cubic feet per secondDec 27, 1964: 14.00 ft, minor flooding; 1,700 cubic feet per secondMar 4, 1965: 11.61 ft, action stage; 888 cubic feet per secondMar 21, 1965: 11.04 ft, action stage; 747 cubic feet per secondJun 28, 1965: 11.08 ft, action stage; 789 cubic feet per secondOct 1, 1965: 12.05 ft, minor flooding; 1,000 cubic feet per secondJan 27, 1966: 13.44 ft, minor flooding; 1,620 cubic feet per secondFeb 20, 1966: 11.76 ft, action stage; 938 cubic feet per secondMar 6, 1966: 13.20 ft, minor flooding; 1,500 cubic feet per secondMar 16, 1966: 11.57 ft, action stage; 881 cubic feet per secondJul 3, 1966: 13.78 ft, minor flooding; 1,790 cubic feet per secondAug 9, 1966: 14.20 ft, minor flooding; 2,020 cubic feet per secondOct 2, 1966: 12.28 ft, minor flooding; 1,280 cubic feet per secondOct 11, 1966: 12.83 ft, minor flooding; 1,380 cubic feet per secondFeb 14, 1967: 11.61 ft, action stage; 1,130 cubic feet per secondAug 30, 1967: 12.99 ft, minor flooding; 1,500 cubic feet per secondMar 19, 1969: 11.18 ft, action stage; 764 cubic feet per secondSep 24, 1969: 11.00 ft, action stage; 700 cubic feet per secondOct 5, 1969: 11.49 ft, action stage; 867 cubic feet per secondNov 3, 1969: 14.18 ft, minor flooding; 2,010 cubic feet per secondDec 11, 1969: 11.74 ft, action stage; 942 cubic feet per secondFeb 4, 1970: 11.59 ft, action stage; 897 cubic feet per secondFeb 18, 1970: 11.95 ft, action stage; 1,010 cubic feet per secondMar 30, 1970: 17.57 ft, major flooding; 4,080 cubic feet per secondAug 22, 1970: 12.16 ft, minor flooding; 1,070 cubic feet per secondAug 17, 1971: 13.49 ft, minor flooding; 1,770 cubic feet per secondJun 21, 1972: 12.60 ft, minor flooding; 1,320 cubic feet per secondJan 29, 1973: 11.97 ft, action stage; 1,100 cubic feet per secondFeb 11, 1973: 11.45 ft, action stage; 946 cubic feet per secondMar 11, 1973: 11.55 ft, action stage; 975 cubic feet per secondApr 5, 1973: 22.98 ft, major flooding; 11,600 cubic feet per secondMay 31, 1973: 11.67 ft, action stage; 1,010 cubic feet per secondJun 20, 1973: 11.54 ft, action stage; 973 cubic feet per secondAug 19, 1974: 11.40 ft, action stage; 867 cubic feet per secondSep 9, 1974: 11.78 ft, action stage; 984 cubic feet per secondApr 15, 1975: 14.46 ft, minor flooding; 2,180 cubic feet per secondJul 28, 1975: 12.79 ft, minor flooding; 1,340 cubic feet per secondSep 9, 1975: 11.16 ft, action stage; 788 cubic feet per secondSep 26, 1976: 11.97 ft, action stage; 1,040 cubic feet per secondNov 30, 1976: 12.68 ft, minor flooding; 1,140 cubic feet per secondJan 4, 1977: 11.77 ft, action stage; 896 cubic feet per secondAug 22, 1977: 12.77 ft, minor flooding; 1,340 cubic feet per secondSep 6, 1977: 12.25 ft, minor flooding; 1,200 cubic feet per secondSep 22, 1977: 11.67 ft, action stage; 960 cubic feet per secondDec 6, 1977: 11.36 ft, action stage; 918 cubic feet per secondJan 20, 1978: 11.66 ft, action stage; 1,010 cubic feet per secondMar 16, 1978: 11.17 ft, action stage; 855 cubic feet per secondMay 12, 1979: 12.69 ft, minor flooding; 1,360 cubic feet per secondJun 27, 1979: 11.41 ft, action stage; 932 cubic feet per secondSep 16, 1979: 14.43 ft, minor flooding; 2,160 cubic feet per secondSep 28, 1979: 11.03 ft, action stage; 809 cubic feet per secondMar 11, 1980: 11.91 ft, action stage; 1,080 cubic feet per secondMar 6, 1981: 11.06 ft, action stage; 828 cubic feet per secondApr 12, 1982: 11.63 ft, action stage; 894 cubic feet per secondFeb 15, 1983: 12.06 ft, minor flooding; 1,200 cubic feet per secondMar 18, 1983: 13.51 ft, minor flooding; 1,800 cubic feet per secondApr 10, 1983: 13.18 ft, minor flooding; 1,640 cubic feet per secondMar 29, 1984: 15.43 ft, moderate flooding; 2,750 cubic feet per secondSep 2, 1985: 11.23 ft, action stage; 873 cubic feet per secondJan 11, 1986: 13.21 ft, minor flooding; 1,420 cubic feet per secondFeb 11, 1986: 15.00 ft, moderate flooding; 2,300 cubic feet per secondMar 16, 1986: 11.54 ft, action stage; 817 cubic feet per secondDec 13, 1986: 11.51 ft, action stage; 809 cubic feet per secondJan 6, 1987: 11.08 ft, action stage; 691 cubic feet per secondJan 23, 1987: 12.64 ft, minor flooding; 1,180 cubic feet per secondFeb 8, 1987: 12.26 ft, minor flooding; 1,050 cubic feet per secondFeb 23, 1987: 11.00 ft, action stage; 672 cubic feet per secondMar 31, 1987: 11.86 ft, action stage; 1,020 cubic feet per secondAug 15, 1987: 11.37 ft, action stage; 773 cubic feet per secondFeb 21, 1988: 14.52 ft, minor flooding; 2,020 cubic feet per secondJan 31, 1991: 11.14 ft, action stage; 707 cubic feet per secondMar 4, 1991: 12.97 ft, minor flooding; 1,310 cubic feet per secondMar 19, 1991: 11.14 ft, action stage; 706 cubic feet per secondApr 10, 1991: 11.40 ft, action stage; 778 cubic feet per secondAug 6, 1991: 13.58 ft, minor flooding; 1,580 cubic feet per secondOct 5, 1992: 11.62 ft, action stage; 842 cubic feet per secondMar 27, 1993: 11.42 ft, action stage; 785 cubic feet per secondNov 11, 1993: 11.40 ft, action stage; 778 cubic feet per secondJan 31, 1994: 13.26 ft, minor flooding; 1,430 cubic feet per secondMar 3, 1994: 11.80 ft, action stage; 898 cubic feet per secondOct 12, 1994: 13.30 ft, minor flooding; 1,450 cubic feet per secondOct 9, 1996: 16.19 ft, moderate flooding; 3,040 cubic feet per secondApr 29, 1997: 11.32 ft, action stage; 756 cubic feet per secondAug 4, 1997: 11.80 ft, action stage; 897 cubic feet per secondDec 16, 1997: 11.14 ft, action stage; 706 cubic feet per secondJan 28, 1998: 12.54 ft, minor flooding; 1,150 cubic feet per secondFeb 18, 1998: 17.03 ft, major flooding; 3,730 cubic feet per secondMar 20, 1998: 11.51 ft, action stage; 809 cubic feet per secondOct 5, 1998: 11.69 ft, action stage; 863 cubic feet per secondMar 10, 2003: 14.10 ft, minor flooding; 1,820 cubic feet per secondJul 9, 2004: 11.03 ft, action stage; 678 cubic feet per secondJul 18, 2004: 11.10 ft, action stage; 696 cubic feet per secondSep 9, 2004: 17.78 ft, major flooding; 4,410 cubic feet per secondSep 29, 2004: 16.38 ft, moderate flooding; 3,190 cubic feet per secondAug 4, 2007: 13.26 ft, minor flooding; 1,430 cubic feet per secondSep 1, 2007: 11.21 ft, action stage; 726 cubic feet per secondOct 20, 2007: 13.25 ft, minor flooding; 1,430 cubic feet per secondMar 9, 2008: 11.82 ft, action stage; 903 cubic feet per secondAug 24, 2008: 19.15 ft, major flooding; 5,740 cubic feet per secondApr 4, 2009: 14.47 ft, minor flooding; 2,010 cubic feet per secondMay 27, 2009: 13.96 ft, minor flooding; 1,760 cubic feet per secondFeb 14, 2010: 11.06 ft, action stage; 686 cubic feet per secondFeb 11, 2011: 7.17 ft, below flood stage; 110 cubic feet per secondJun 28, 2012: 18.69 ft, major flooding; 5,270 cubic feet per secondFeb 27, 2013: 9.31 ft, below flood stage; 335 cubic feet per secondMar 19, 2014: 11.64 ft, action stage; 848 cubic feet per secondApr 9, 2014: 13.17 ft, minor flooding; 1,400 cubic feet per secondApr 20, 2014: 14.05 ft, minor flooding; 1,800 cubic feet per secondSep 9, 2014: 15.16 ft, moderate flooding; 2,390 cubic feet per secondOct 1, 2014: 12.24 ft, minor flooding; 1,040 cubic feet per secondDec 26, 2014: 12.04 ft, minor flooding; 973 cubic feet per secondApr 16, 2015: 12.15 ft, minor flooding; 1,010 cubic feet per secondSep 13, 2017: 17.51 ft, major flooding; 4,300 cubic feet per secondJun 13, 2020: 12.30 ft, minor flooding; 1,030 cubic feet per secondAug 13, 2020: 12.44 ft, minor flooding; 1,040 cubic feet per secondJul 8, 2021: 13.90 ft, minor flooding; 1,730 cubic feet per secondAug 7, 2021: 15.53 ft, moderate flooding; 2,680 cubic feet per secondSep 20, 2021: 12.05 ft, minor flooding; 954 cubic feet per secondNov 8, 2021: 12.22 ft, minor flooding; 1,010 cubic feet per secondMar 14, 2022: 12.72 ft, minor flooding; 1,200 cubic feet per secondApr 9, 2022: 12.38 ft, minor flooding; 1,070 cubic feet per secondApr 18, 2022: 13.00 ft, minor flooding; 1,320 cubic feet per secondSep 4, 2022: 12.32 ft, minor flooding; 1,070 cubic feet per secondDec 19, 2023: 14.00 ft, minor flooding; 1,780 cubic feet per secondApr 13, 2024: 12.28 ft, minor flooding; 1,040 cubic feet per secondAug 8, 2024: 14.65 ft, minor flooding; 2,130 cubic feet per secondMar 12, 2025: 12.08 ft, minor flooding; 960 cubic feet per second Highest, 22.98 ft, Apr 5, 1973 19401960198020002020

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, St. Marys River at Moniac 1920s: 7 1930s: 3 1940s: 0 1950s: 8 1960s: 17 17 1970s: 12 1980s: 9 1990s: 7 2000s: 8 2010s: 8 2020s: 14 1920s1930s1940s1950s1960s1970s1980s1990s2000s2010s2020s
  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 165 listed crests.

Highest listed crests, St. Marys River at Moniac
1Apr 5, 197322.98+10.98Major11,600
2Sep 19, 192819.90+7.90Major6,060
3Aug 24, 200819.15+7.15Major5,740
4Jun 28, 201218.69+6.69Major5,270
5Sep 13, 196418.41+6.41Major4,590
6Sep 9, 200417.78+5.78Major4,410
7Mar 30, 197017.57+5.57Major4,080
8Sep 13, 201717.51+5.51Major4,300
9Feb 18, 199817.03+5.03Major3,730
10Sep 29, 200416.38+4.38Moderate3,190
11Oct 22, 195016.20+4.20Moderate4,050
12Oct 9, 199616.19+4.19Moderate3,040
13Aug 7, 202115.53+3.53Moderate2,680
14Mar 29, 198415.43+3.43Moderate2,750
15May 4, 196415.36+3.36Moderate2,730
16Jun 11, 195715.26+3.26Moderate3,110
17Sep 9, 201415.16+3.16Moderate2,390
18Feb 11, 198615.00+3.00Moderate2,300
19Apr 2, 196214.88+2.88Minor2,730
20Mar 18, 195914.80+2.80Minor2,650
21Oct 2, 192914.70+2.70Minor2,640
22Aug 8, 202414.65+2.65Minor2,130
23Jul 31, 192114.54+2.54Minor2,200
24Feb 21, 198814.52+2.52Minor2,020
25Apr 4, 200914.47+2.47Minor2,010
26Apr 15, 197514.46+2.46Minor2,180
27Sep 16, 197914.43+2.43Minor2,160
28Oct 1, 195314.27+2.27Minor2,140
29Aug 9, 196614.20+2.20Minor2,020
30Nov 3, 196914.18+2.18Minor2,010
31Mar 10, 200314.10+2.10Minor1,820
32Apr 20, 201414.05+2.05Minor1,800
33Dec 27, 196414.00+2.00Minor1,700
34Dec 19, 202314.00+2.00Minor1,780
35May 27, 200913.96+1.96Minor1,760
36Jul 8, 202113.90+1.90Minor1,730
37Mar 7, 195913.82+1.82Minor1,830
38Jul 3, 196613.78+1.78Minor1,790
39Aug 6, 199113.58+1.58Minor1,580
40Mar 18, 198313.51+1.51Minor1,800
41Aug 17, 197113.49+1.49Minor1,770
42Jan 27, 196613.44+1.44Minor1,620
43Sep 16, 193213.42+1.42Minor1,870
44Feb 29, 196413.40+1.40Minor1,560
45Apr 11, 195813.38+1.38Minor1,590
46Oct 12, 199413.30+1.30Minor1,450
47Jan 31, 199413.26+1.26Minor1,430
48Aug 4, 200713.26+1.26Minor1,430
49Oct 20, 200713.25+1.25Minor1,430
50Jan 11, 198613.21+1.21Minor1,420

The worst floods along the St. Marys River

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

April 5, 1973: 22.98 ft here, major flooding

  • MacclennyFL · Apr 5, 1973 · 22.86 ft · Major

September 19, 1928: 19.90 ft here, major flooding

  • MacclennyFL · Sep 20, 1928 · 21.90 ft · Major

August 24, 2008: 19.15 ft here, major flooding

  • MacclennyFL · Aug 24, 2008 · 21.14 ft · Major

Gauges on the St. Marys River

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

Flood gauges on the St. Marys River
Moniac this gaugeFL12.022.98 ft, Apr 5, 19739
MacclennyFL12.024.38 ft, Jun 28, 201219
Traders HillGA7.019.30 ft, Sep 15, 20172
Interstate 95 (in MHHW)FL1.02.79 ft, Oct 7, 20160

Other gauges in Baker County

Flood gauges in Baker County
Macclenny12.024.38 ft, Jun 28, 201219

Baker County: every hazard · River floods across the country · Florida

NOAA National Water Prediction Service, gauge MNIG1, 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.