The monitoring network within this area

Hydrionis holds 1,048 values from 4 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

1,048

Values held

1898–2026

Record spans

Gauges within the Ocoee huc8 subbasin

4 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 TOCCOA RIVER NEAR DIAL, GA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1916–2024.

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	TOCCOA RIVER NEAR DIAL, GA (m³/s)
1916	261
1920	157
1921	233
1922	187
1924	104
1926	68.0
1928	56.1
1929	136
1931	68.0
1932	175
1934	136
1935	53.8
1936	230
1937	94.6
1938	183
1939	91.7
1940	83.3
1941	123
1942	110
1944	86.1
1945	45.6
1946	212
1947	174
1948	114
1949	176
1950	181
1951	210
1952	306
1953	137
1954	222
1955	146
1956	132
1957	155
1959	100.0
1960	87.8
1961	208
1963	165
1964	180
1966	193
1967	416
1968	73.3
1969	105
1971	69.1
1973	247
1975	88.1
1976	201
1977	238
1978	112
1979	294
1980	169
1981	84.4
1982	159
1983	129
1984	115
1985	64.0
1986	34.8
1988	116
1989	164
1990	249
1992	92.9
1994	137
1995	125
1996	213
2018	123
2019	129
2020	167
2021	274
2022	165
2023	90.9
2024	183

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	1916–2024
Completeness	64.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	17 separate periods inside 1916–2024 hold no value. The longest runs from 1997 to 2017 — 21 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1916 and is not continuous from it: 109 years separate the first value from the last, and 64% of the years between them are held. The span is not the record.
Last read from the publisher	2026-10-01
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 TOCCOA RIVER NEAR DIAL, 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. 1913–2024.

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	TOCCOA RIVER NEAR DIAL, GA (mm)
1913	1,000
1914	605
1915	932
1916	1,188
1917	1,206
1918	934
1919	1,094
1920	1,513
1921	988
1922	1,192
1923	1,136
1924	916
1925	535
1926	732
1927	817
1928	1,116
1929	1,540
1930	734
1931	766
1932	1,320
1933	1,015
1934	786
1935	750
1936	1,026
1937	905
1938	881
1939	850
1940	642
1941	554
1942	914
1943	904
1944	782
1945	705
1946	1,372
1947	791
1948	928
1949	1,261
1950	1,034
1951	934
1952	959
1953	790
1954	783
1955	803
1956	812
1957	1,102
1958	875
1959	813
1960	866
1961	1,045
1962	984
1963	815
1964	1,265
1965	812
1966	907
1967	1,112
1968	896
1969	938
1970	830
1971	1,133
1972	1,062
1973	1,388
1974	1,187
1975	1,248
1976	1,267
1977	1,096
1978	831
1979	1,329
1980	1,093
1981	550
1982	1,015
1983	1,142
1984	1,064
1985	628
1986	490
1987	663
1988	494
1989	1,219
1990	1,215
1991	1,112
1992	1,179
1993	932
1994	1,048
1995	920
2017	636
2018	1,244
2019	1,303
2020	1,412
2021	1,291
2022	975
2023	793
2024	888

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	1913–2024
Completeness	81.3% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1913–2024 holds no value: 1996 to 2016, 21 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1913 and is not continuous from it: 112 years separate the first value from the last, and 81% of the years between them are held. The span is not the record.
Inputs last read	2026-10-01 · when the records this was computed from were last read from their publishers
Calculation date	2026-08-24 · when the calculation method was last versioned, not a reading of any publisher
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 Ocoee and what each holds
Gauge	Measures	Values	Record
TOCCOA RIVER NEAR DIAL, GA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	305	1913–2026
OCOEE RIVER AT PARKSVILLE, TN	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	267	1906–2026
OCOEE RIVER AT EMF, TN	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	254	1906–2026
TOCCOA RIVER NEAR BLUE RIDGE, GA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	222	1898–2026

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 — 06020003. 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
TOCCOA RIVER NEAR DIAL, 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	2026-10-02
OCOEE RIVER AT PARKSVILLE, TN	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	2026-10-02
OCOEE RIVER AT EMF, TN	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	2026-10-02
TOCCOA RIVER NEAR BLUE RIDGE, 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	2026-10-02

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 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	4	yes, 3 or more
Years spanned	129	yes, 20 or more
Values held	1,048	yes, 1000 or more
Distinct measurements	5	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-03558000.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), Ocoee gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-ocoee/

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 Ocoee 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 confidence2024-12-29

Source: USGS — National Water Information System, USGS site 03558000, 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 1 October 2026.