The monitoring network within this area

Hydrionis holds 443 values from 2 gauges within it. Discharge is a property of a gauge and its reach, not of this drainage area, so this page reports the network and its records rather than a single figure.

Gauges

443

Values held

1893–2026

Record spans

Gauges within the Etowah huc8 subbasin

2 monitoring points, positioned as the publisher records them.

Flood peaks, as measured

This gauge's flood record, as measured. Unlike a daily mean it is the discharge at the moment the river was highest, which is the figure flood frequency analysis is built on.

Largest measured flow of each year at ETOWAH RIVER AT CANTON, GA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1893–2025.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Published by the gauge's own operator from its sub-daily record; Hydrionis stores the figure rather than recomputing it. A year the gauge did not cover produces no value rather than a low one, and the gaps are stated below the chart. A peak is a property of this gauge and its reach: a larger flood upstream or downstream of it is not in this series.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	ETOWAH RIVER AT CANTON, GA (m³/s)
1893	266
1894	123
1895	351
1896	150
1897	286
1898	309
1899	589
1900	348
1901	555
1903	578
1904	272
1905	251
1907	197
1908	300
1909	422
1910	195
1911	314
1912	521
1913	236
1914	211
1916	1,022
1917	405
1918	179
1919	1,022
1921	609
1922	289
1924	140
1925	247
1926	185
1927	268
1928	303
1929	385
1930	433
1932	294
1935	185
1936	643
1937	433
1938	558
1939	180
1940	252
1941	250
1942	377
1944	300
1945	147
1946	915
1947	411
1948	241
1950	241
1951	221
1952	552
1953	230
1954	439
1955	357
1956	207
1957	439
1959	205
1960	179
1961	547
1963	640
1964	708
1965	247
1966	538
1967	450
1968	311
1969	337
1970	187
1971	164
1972	402
1974	348
1975	337
1976	538
1977	524
1979	612
1980	422
1981	156
1982	682
1983	254
1985	142
1987	345
1988	264
1989	257
1990	767
1991	168
1992	217
1994	267
1995	297
1996	552
1997	320
1998	425
1999	157
2000	252
2001	262
2002	201
2003	385
2004	433
2005	255
2006	132
2008	170
2009	459
2011	275
2012	143
2013	439
2015	360
2017	91.2
2018	283
2019	399
2020	436
2021	334
2022	345
2023	360
2024	365
2025	467

About this series

Everything below is a property of the data rather than a rating of it. There is deliberately no single confidence score: how much a gap matters depends on what you are about to do with the series, and only you know that.

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Measured
Period held	1893–2025
Completeness	84.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	20 separate periods inside 1893–2025 hold no value. The longest runs from 1933 to 1934 — 2 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1893 and is not continuous from it: 133 years separate the first value from the last, and 84% of the years between them are held. The span is not the record.
Last read from the publisher	2026-08-31
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

How much of the rain came back out

A discharge in cubic metres per second cannot be compared with anything: the larger number may only mean the larger catchment. Divided by the area draining to the gauge it becomes a depth of water over that land, which answers a question a reader already has — of the rain that fell here, how much came back out as river?

Water leaving the catchment above ETOWAH RIVER AT CANTON, GA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1897–2024.

Show relevant events (1 event)Shading marks when something was recorded, not what caused the line.

Computed by Hydrionis from the published annual mean flow and the catchment area the station's own publisher states. It is not a water balance: the difference between rainfall and runoff is not evaporation alone but also change in groundwater storage, water abstracted and taken elsewhere, and water imported by transfer schemes — which is why a catchment can yield more runoff than the rain that fell on it without anything being measured wrongly. A different area figure rescales every value here by the ratio between them.

What the shaded periods are (1 event)

A shaded period marks when something was recorded, not what caused the shape of the line. Where the two coincide, they coincided.

Documented record — A documented event, compiled from cited sources after it happened. The dates are as good as the record, which for older events can mean the month rather than the day.

Event	Type	Period	Standing	Authority
Hurricane Katrina water and sanitation collapse	Flood	2005-08-29 – 2005-09-30	Documented record	Compiled record

Not shown on this chart

The 1976 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
The 2022 drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Yorkshire drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cantareira water crisis, São Paulo — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
Cape Town Day Zero — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.
European drought — This event’s area does not contain this chart’s subject. Sharing a country is not sharing an event, so it is not drawn.

View the data behind this chart

Underlying data
Period	ETOWAH RIVER AT CANTON, GA (mm)
1897	605
1898	737
1899	949
1900	1,015
1901	1,091
1902	814
1903	963
1904	341
1937	733
1938	521
1939	510
1940	449
1941	371
1942	600
1943	634
1944	677
1945	529
1946	1,008
1947	554
1948	749
1949	899
1950	578
1951	525
1952	700
1953	584
1954	504
1955	448
1956	509
1957	620
1958	580
1959	520
1960	587
1961	827
1962	691
1963	758
1964	1,167
1965	625
1966	740
1967	820
1968	730
1969	723
1970	513
1971	781
1972	832
1973	975
1974	813
1975	813
1976	887
1977	808
1978	680
1979	934
1980	873
1981	343
1982	814
1983	845
1984	900
1985	482
1986	316
1987	473
1988	319
1989	834
1990	921
1991	749
1992	832
1993	697
1994	683
1995	681
1996	814
1997	678
1998	825
1999	433
2000	384
2001	479
2002	477
2003	820
2004	608
2005	710
2006	431
2007	312
2008	284
2009	769
2010	616
2011	400
2012	357
2013	1,016
2014	625
2015	694
2016	514
2017	392
2018	785
2019	942
2020	979
2021	789
2022	693
2023	591
2024	604

About this series

Source	United States Geological Survey — National Water Information System · US Government work — public domain
How the values came to exist	Derived Computed by Hydrionis
Period held	1897–2024
Completeness	75.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1897–2024 holds no value: 1905 to 1936, 32 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1897 and is not continuous from it: 128 years separate the first value from the last, and 75% of the years between them are held. The span is not the record.
Last read from the publisher	2026-08-24
Redistribution	Permitted by the upstream licences
Commercial reuse	Permitted by the upstream licences. No Hydrionis access tier can widen this.
Methodology	How this was produced

Every gauge Hydrionis holds within this area

Gauges within the Etowah and what each holds
Gauge	Measures	Values	Record
ETOWAH RIVER AT CANTON, GA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	265	1893–2026
ETOWAH RIVER NEAR KINGSTON,GA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	178	1919–2026

How these gauges were attached to this water

Assigned by the publisher to a numbered basin Every gauge here is assigned to this drainage area by its own publisher, which issues the area an official code — 03150104. A drainage area is not a river: it contains the tributaries as well as the main channel, and a gauge in it may be on any of them.

What each gauge’s link to this water rests on
Gauge	Evidence	Established
ETOWAH RIVER AT CANTON, GA	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-08-26
ETOWAH RIVER NEAR KINGSTON,GA	Stated by the publisher — USGS site service, huc_cd field — https://waterservices.usgs.gov/nwis/site/ ; named from the USGS Watershed Boundary Dataset 8-digit HU (Subbasin) layer — https://hydro.nationalmap.gov/arcgis/rest/services/wbd/MapServer/4	2026-08-26

What this record holds

Hydrionis decides which waters get a page, and which of those are offered to search, from what is actually held rather than from how the page reads. Five signals are counted; this record has 3 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	134	yes, 20 or more
Values held	443	no
Distinct measurements	4	yes, 2 or more
Publishers measuring it	2	yes, 2 or more
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-02392000.json
How to cite this, and who you must credit
How these figures were produced
Request this at a different scale, format or geography

No bulk download is offered here, which is a licence position rather than a product one: at least one contributing publisher does not permit redistribution. The values can be read on the page, cited, and pointed to at source.

Attribution and citation

Suggested citation for Hydrionis

Hydrionis (2026), Etowah gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-etowah/

Cite Hydrionis where you rely on values Hydrionis computed, on the method that produced them, or on the compilation itself. The underlying measurements remain the publishers’ and their attribution requirements apply to you directly.

Recommended, not required. Hydrionis does not claim rights over unmodified public data it relayed, and doing arithmetic on somebody else’s measurements does not make them Hydrionis’s. Cite the version and the access date: the Etowah gauge records changes as publishers release and as methods are revised, and a citation without both cannot be checked later. Full guidance is on cite and reuse.

None of the contributing licences requires attribution. Crediting the publishers is still good practice and they are listed above.

Where these figures come from

MeasuredHigh confidence2025-02-13

Source: USGS — National Water Information System, USGS site 02392000, annual peak streamflow. Licence: Open.

Method: The instantaneous maximum discharge of each water year as published by USGS, dated to the day it occurred. One value per October-to-September water year; where the publisher lists both a systematic and a historic peak for a year, the larger is the annual maximum. Values the publisher marks as maximum daily averages are not held here, because they are not instantaneous peaks. Values marked as bounded rather than measured are held as censored observations carrying the bound. Cubic feet per second are converted to cubic metres per second and the publisher unit is recorded alongside.

Rating curves are extrapolated at extreme discharges, so the largest values in a peak series carry the largest measurement uncertainty. Data from the U.S. Geological Survey National Water Information System, a work of the United States government and therefore in the public domain.

Retrieved 31 August 2026.