The monitoring network within this area

Hydrionis holds 695 values from 3 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

695

Values held

1896–2026

Record spans

Gauges within the South Fork Holston huc8 subbasin

3 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 S F HOLSTON RIVER AT RIVERSIDE, NEAR CHILHOWIE, VA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1908–2025.

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	S F HOLSTON RIVER AT RIVERSIDE, NEAR CHILHOWIE, VA (m³/s)
1908	125
1909	59.5
1921	40.2
1922	53.2
1923	170
1924	53.2
1926	41.1
1927	68.8
1928	31.1
1929	51.5
1931	51.5
1942	34.0
1944	67.4
1945	67.4
1946	53.0
1947	75.3
1948	54.7
1949	39.9
1950	36.0
1952	15.3
1953	41.1
1954	64.6
1955	73.1
1956	58.6
1957	108
1958	104
1959	40.2
1960	59.5
1961	69.4
1963	71.4
1964	80.1
1965	86.9
1966	65.4
1968	37.4
1969	27.2
1970	48.7
1971	41.1
1972	60.6
1973	49.6
1974	87.8
1975	51.5
1976	39.9
1977	148
1979	57.8
1980	38.5
1981	35.4
1982	57.8
1983	49.0
1984	82.1
1985	23.8
1986	28.9
1987	78.2
1988	33.7
1989	141
1990	49.3
1991	45.0
1992	58.9
1993	97.7
1994	71.6
1995	165
1996	112
1997	31.7
1998	62.0
1999	15.3
2000	16.0
2001	88.3
2002	78.2
2003	94.0
2005	40.8
2006	29.2
2007	29.4
2008	45.6
2009	27.0
2010	54.9
2011	54.7
2013	81.8
2015	72.2
2017	71.9
2018	54.4
2019	77.6
2020	98.8
2022	60.9
2023	23.6
2024	331
2025	0

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	1908–2025
Completeness	72.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	14 separate periods inside 1908–2025 hold no value. The longest runs from 1910 to 1920 — 11 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1908 and is not continuous from it: 118 years separate the first value from the last, and 72% 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 S F HOLSTON RIVER AT RIVERSIDE, NEAR CHILHOWIE, VA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1921–2024.

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	S F HOLSTON RIVER AT RIVERSIDE, NEAR CHILHOWIE, VA (mm)
1921	503
1922	627
1923	681
1924	682
1925	267
1926	399
1927	487
1928	505
1929	599
1930	307
1931	359
1943	429
1944	488
1945	505
1946	468
1947	452
1948	449
1949	552
1950	558
1951	410
1952	355
1953	400
1954	377
1955	480
1956	432
1957	697
1958	575
1959	457
1960	494
1961	567
1962	566
1963	406
1964	456
1965	437
1966	527
1967	503
1968	445
1969	366
1970	338
1971	568
1972	741
1973	594
1974	719
1975	642
1976	483
1977	632
1978	495
1979	753
1980	459
1981	385
1982	576
1983	560
1984	532
1985	397
1986	409
1987	605
1988	229
1989	602
1990	570
1991	472
1992	563
1993	516
1994	657
1995	517
1996	589
1997	442
1998	590
1999	303
2000	314
2001	382
2002	364
2003	733
2004	598
2005	453
2006	488
2007	311
2008	280
2009	539
2010	425
2011	540
2012	455
2013	813
2014	411
2015	600
2016	417
2017	492
2018	827
2019	665
2020	884
2021	514
2022	532
2023	405
2024	627

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	1921–2024
Completeness	89.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1921–2024 holds no value: 1932 to 1942, 11 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1921 and is not continuous from it: 104 years separate the first value from the last, and 89% 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 South Fork Holston and what each holds
Gauge	Measures	Values	Record
S F HOLSTON RIVER AT RIVERSIDE, NEAR CHILHOWIE, VA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	321	1908–2026
SOUTH FORK HOLSTON RIVER AT KINGSPORT, TN	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	191	1925–2026
S F HOLSTON R AT BLUFF CITY, TN	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	183	1896–2026

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 — 06010102. 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
S F HOLSTON RIVER AT RIVERSIDE, NEAR CHILHOWIE, VA	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
SOUTH FORK HOLSTON RIVER AT KINGSPORT, 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
S F HOLSTON R AT BLUFF CITY, 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

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 4 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	3	yes, 3 or more
Years spanned	131	yes, 20 or more
Values held	695	no
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-03471500.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), South Fork Holston gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-south-fork-holston/

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 South Fork Holston 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 confidence2025-05-13

Source: USGS — National Water Information System, USGS site 03471500, 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.