The monitoring network within this area

Hydrionis holds 436 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

436

Values held

1894–2026

Record spans

Gauges within the Lower Oconee 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 OCONEE RIVER AT DUBLIN, GA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1894–2025.

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	OCONEE RIVER AT DUBLIN, GA (m³/s)
1894	580
1895	1,407
1896	733
1897	1,308
1898	1,591
1899	1,283
1900	1,640
1901	1,297
1902	1,801
1903	1,495
1904	326
1905	951
1906	923
1907	510
1908	1,376
1909	1,393
1910	589
1911	289
1912	1,693
1913	1,937
1914	297
1915	790
1916	697
1917	886
1918	490
1919	1,348
1921	1,070
1922	1,543
1923	1,102
1924	1,393
1925	2,687
1926	688
1927	399
1928	2,237
1929	2,614
1931	665
1932	883
1933	586
1934	665
1935	428
1936	2,738
1937	997
1938	1,096
1939	1,373
1940	532
1941	286
1942	1,475
1943	1,212
1944	1,744
1945	719
1946	835
1947	1,212
1948	1,104
1950	309
1951	250
1952	1,354
1953	960
1955	334
1956	538
1957	368
1958	544
1959	640
1960	906
1961	1,710
1962	949
1963	892
1964	1,410
1966	1,167
1967	343
1968	371
1969	660
1970	991
1971	1,985
1972	1,184
1973	872
1974	748
1975	1,240
1976	1,048
1977	770
1978	1,286
1979	1,373
1980	1,413
1981	909
1982	804
1983	1,277
1985	878
1986	323
1987	869
1988	300
1989	345
1990	1,308
1991	813
1992	309
1994	714
1995	1,529
1996	1,107
1997	657
1998	2,407
1999	487
2000	306
2001	756
2002	253
2003	881
2004	320
2005	915
2006	311
2007	719
2008	266
2009	1,314
2011	428
2012	189
2013	592
2014	756
2015	362
2017	439
2018	300
2019	929
2020	1,413
2021	493
2022	1,201
2023	1,266
2024	1,152
2025	603

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	1894–2025
Completeness	93.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	9 separate periods inside 1894–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1894 and is not continuous from it: 132 years separate the first value from the last, and 93% 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 OCONEE RIVER AT DUBLIN, 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. 1953–2025.

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	OCONEE RIVER AT DUBLIN, GA (mm)
1953	388
1954	155
1955	174
1956	248
1957	330
1958	349
1959	294
1960	440
1961	464
1962	428
1963	414
1964	665
1965	369
1966	451
1967	358
1968	239
1969	304
1970	246
1971	453
1972	329
1973	466
1974	348
1975	623
1976	420
1977	363
1978	296
1979	328
1980	403
1981	174
1982	328
1983	448
1984	377
1985	203
1986	156
1987	304
1988	140
1989	312
1990	317
1991	372
1992	396
1993	401
1994	438
1995	413
1996	358
1997	391
1998	566
1999	165
2000	141
2001	248
2002	176
2003	462
2004	265
2005	364
2006	155
2007	136
2008	159
2009	484
2010	334
2011	153
2012	73.0
2013	376
2014	280
2015	338
2016	278
2017	201
2018	314
2019	301
2020	541
2021	320
2022	288
2023	329
2024	321
2025	258

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	1953–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1953 to 2025 is held.
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 Lower Oconee and what each holds
Gauge	Measures	Values	Record
OCONEE RIVER AT MILLEDGEVILLE, GA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	230	1904–2026
OCONEE RIVER AT DUBLIN, GA	catchment area, annual maximum river flow, mean river flow	206	1894–2026

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 — 03070102. 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
OCONEE RIVER AT MILLEDGEVILLE, 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
OCONEE RIVER AT DUBLIN, 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	133	yes, 20 or more
Values held	436	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-02223000.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), Lower Oconee gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-lower-oconee/

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 Lower Oconee 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 confidence2025-04-07

Source: USGS — National Water Information System, USGS site 02223000, 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.