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St. Marys River at Interstate 95 (in MHHW)

Highest listed crest 2.79 ftFlood stage 1.0 ft53 crests since 2011

The St. Marys River at Interstate 95 (in MHHW) crested above flood stage 53 times among the 53 crests the National Weather Service lists from 2011 to 2026. The highest, 2.79 ft on October 7, 2016, was moderate flooding, 1.79 feet above flood stage.

The gauge

Highest listed crest
2.79 ft
October 7, 2016
Flood stage
1.0 ft
Major flooding from 3.0 ft
Crests at major
0
53 above flood stage
Most recent flood crest
October 9, 2026
1.29 ft, minor flooding
Location
Nassau County
Near St. Marys (4.6 mi), Kingsland (10.7 mi), Fernandina Beach (13.5 mi)

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 Interstate 95 (in MHHW)
Action stage0.50—The level at which the NWS or its partners begin to take action
Flood stage (minor)1.044Oct 9, 2026Minimal or no property damage, but possibly some public threat
Moderate flood stage1.59Oct 10, 2025Some inundation of structures and roads near the stream
Major flood stage3.00—Extensive inundation of structures and roads

Every listed crest

53 crests from 2011 to 2026. Filled: at or above flood stage. Hover a crest for its date and stage.

Listed crests at the St. Marys River at Interstate 95 (in MHHW), 2011 to 2026 11.522.53ft Flood stage 1.0 ftMajor 3.0 ft Aug 26, 2011: 1.09 ft, minor floodingOct 10, 2011: 1.08 ft, minor floodingMay 28, 2012: 1.71 ft, moderate floodingJun 7, 2012: 1.00 ft, minor floodingJun 27, 2012: 1.07 ft, minor floodingJul 3, 2012: 1.60 ft, moderate floodingNov 17, 2012: 1.10 ft, minor floodingOct 15, 2013: 1.06 ft, minor floodingNov 5, 2013: 1.04 ft, minor floodingApr 20, 2014: 1.00 ft, minor floodingDec 8, 2014: 1.06 ft, minor floodingSep 27, 2015: 1.12 ft, minor floodingOct 2, 2015: 1.11 ft, minor floodingOct 27, 2015: 1.24 ft, minor floodingOct 7, 2016: 2.79 ft, moderate floodingNov 13, 2016: 1.28 ft, minor floodingSep 11, 2017: 1.58 ft, moderate floodingOct 18, 2017: 1.06 ft, minor floodingJan 3, 2018: 1.04 ft, minor floodingNov 23, 2018: 1.31 ft, minor floodingAug 3, 2019: 1.03 ft, minor floodingAug 31, 2019: 1.06 ft, minor floodingSep 4, 2019: 1.44 ft, minor floodingDec 25, 2019: 1.08 ft, minor floodingSep 15, 2020: 1.30 ft, minor floodingSep 21, 2020: 1.90 ft, moderate floodingOct 19, 2020: 1.27 ft, minor floodingNov 7, 2021: 1.77 ft, moderate floodingMay 12, 2022: 1.04 ft, minor floodingSep 29, 2022: 1.26 ft, minor floodingDec 21, 2022: 1.15 ft, minor floodingApr 10, 2023: 1.64 ft, moderate floodingJun 5, 2023: 1.54 ft, moderate floodingAug 3, 2023: 1.01 ft, minor floodingSep 27, 2023: 1.40 ft, minor floodingOct 1, 2023: 1.31 ft, minor floodingNov 2, 2023: 1.00 ft, minor floodingNov 15, 2023: 1.14 ft, minor floodingNov 26, 2023: 1.10 ft, minor floodingDec 17, 2023: 1.33 ft, minor floodingFeb 6, 2024: 1.02 ft, minor floodingAug 22, 2024: 1.22 ft, minor floodingSep 15, 2024: 1.32 ft, minor floodingSep 21, 2024: 1.18 ft, minor floodingOct 10, 2024: 1.48 ft, minor floodingNov 16, 2024: 1.36 ft, minor floodingSep 9, 2025: 1.36 ft, minor floodingSep 13, 2025: 1.21 ft, minor floodingOct 4, 2025: 1.31 ft, minor floodingOct 10, 2025: 1.73 ft, moderate floodingSep 8, 2026: 1.11 ft, minor floodingSep 24, 2026: 1.01 ft, minor floodingOct 9, 2026: 1.29 ft, minor flooding Highest, 2.79 ft, Oct 7, 2016 201520202025

Crests at or above flood stage, by decade

Crests at or above flood stage per decade, St. Marys River at Interstate 95 (in MHHW) 2010s: 24 2020s: 29 29 2010s2020s
  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.
  3. 1 crest measured on an earlier gauge datum is left out: 5.07 ft on Sep 10, 1964.

Highest crests

The 50 highest of 53 listed crests.

Highest listed crests, St. Marys River at Interstate 95 (in MHHW)
1Oct 7, 20162.79+1.79Moderate—
2Sep 21, 20201.90+0.90Moderate—
3Nov 7, 20211.77+0.77Moderate—
4Oct 10, 20251.73+0.73Moderate—
5May 28, 20121.71+0.71Moderate—
6Apr 10, 20231.64+0.64Moderate—
7Jul 3, 20121.60+0.60Moderate—
8Sep 11, 20171.58+0.58Moderate—
9Jun 5, 20231.54+0.54Moderate—
10Oct 10, 20241.48+0.48Minor—
11Sep 4, 20191.44+0.44Minor—
12Sep 27, 20231.40+0.40Minor—
13Nov 16, 20241.36+0.36Minor—
14Sep 9, 20251.36+0.36Minor—
15Dec 17, 20231.33+0.33Minor—
16Sep 15, 20241.32+0.32Minor—
17Nov 23, 20181.31+0.31Minor—
18Oct 1, 20231.31+0.31Minor—
19Oct 4, 20251.31+0.31Minor—
20Sep 15, 20201.30+0.30Minor—
21Oct 9, 20261.29+0.29Minor—
22Nov 13, 20161.28+0.28Minor—
23Oct 19, 20201.27+0.27Minor—
24Sep 29, 20221.26+0.26Minor—
25Oct 27, 20151.24+0.24Minor—
26Aug 22, 20241.22+0.22Minor—
27Sep 13, 20251.21+0.21Minor—
28Sep 21, 20241.18+0.18Minor—
29Dec 21, 20221.15+0.15Minor—
30Nov 15, 20231.14+0.14Minor—
31Sep 27, 20151.12+0.12Minor—
32Oct 2, 20151.11+0.11Minor—
33Sep 8, 20261.11+0.11Minor—
34Nov 17, 20121.10+0.10Minor—
35Nov 26, 20231.10+0.10Minor—
36Aug 26, 20111.09+0.09Minor—
37Oct 10, 20111.08+0.08Minor—
38Dec 25, 20191.08+0.08Minor—
39Jun 27, 20121.07+0.07Minor—
40Oct 15, 20131.06+0.06Minor—
41Dec 8, 20141.06+0.06Minor—
42Oct 18, 20171.06+0.06Minor—
43Aug 31, 20191.06+0.06Minor—
44Nov 5, 20131.04+0.04Minor—
45Jan 3, 20181.04+0.04Minor—
46May 12, 20221.04+0.04Minor—
47Aug 3, 20191.03+0.03Minor—
48Feb 6, 20241.02+0.02Minor—
49Aug 3, 20231.01+0.01Minor—
50Sep 24, 20261.01+0.01Minor—

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.

September 21, 2020: 1.90 ft here, moderate flooding

November 7, 2021: 1.77 ft here, moderate flooding

  • MacclennyFL · Nov 8, 2021 · 13.08 ft · Minor
  • MoniacFL · Nov 8, 2021 · 12.22 ft · Minor

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
MoniacFL12.022.98 ft, Apr 5, 19739
MacclennyFL12.024.38 ft, Jun 28, 201219
Traders HillGA7.019.30 ft, Sep 15, 20172
Interstate 95 (in MHHW) this gaugeFL1.02.79 ft, Oct 7, 20160

Other gauges in Nassau County

Flood gauges in Nassau County
Amelia River Public Boat Ramp (in MHHW)2.02.65 ft, Oct 10, 20250
Atlantic Coast at Fernandina Beach (in MHHW)2.06.94 ft, Oct 1, 18986
Kings Ferry (in MHHW)1.01.51 ft, Oct 10, 20260
US-17 (in MHHW)1.31.49 ft, Oct 10, 20260
Thomas Creek (in NAVD88)3.54.40 ft, Oct 11, 20260

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

NOAA National Water Prediction Service, gauge KLNG1, 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.