The monitoring network within this area

Hydrionis holds 395 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

395

Values held

1898–2026

Record spans

Gauges within the Lower Scioto 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 Scioto River at Chillicothe OH

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1898–2025.

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	Scioto River at Chillicothe OH (m³/s)
1898	0
1908	1,659
1909	2,132
1910	2,653
1911	943
1912	1,164
1913	7,362
1914	770
1915	1,076
1916	1,886
1917	847
1918	1,192
1919	1,090
1920	1,815
1921	1,705
1922	1,362
1923	592
1924	1,719
1925	430
1926	895
1927	1,693
1929	2,512
1930	1,410
1931	481
1933	2,401
1934	371
1935	651
1936	1,348
1937	2,860
1938	1,337
1939	974
1940	1,999
1941	464
1942	917
1943	1,979
1944	895
1945	2,367
1946	1,121
1947	1,447
1948	1,744
1949	1,093
1950	1,362
1951	1,246
1952	2,418
1953	311
1954	340
1955	787
1956	617
1957	1,557
1958	980
1959	4,078
1960	606
1961	818
1962	1,002
1963	2,180
1964	2,248
1965	762
1966	626
1967	796
1968	1,104
1969	799
1970	940
1971	756
1972	733
1973	762
1974	796
1975	1,617
1976	875
1977	583
1978	983
1979	1,152
1980	895
1981	869
1982	827
1983	991
1984	980
1985	923
1986	697
1988	691
1989	784
1990	1,000
1991	1,399
1992	702
1993	745
1994	1,042
1995	733
1996	1,085
1997	1,192
1998	807
1999	597
2000	779
2001	674
2003	694
2004	1,461
2005	1,917
2006	762
2007	1,017
2008	1,223
2009	668
2010	745
2011	1,036
2013	583
2015	977
2017	722
2018	1,254
2019	1,138
2020	1,240
2021	736
2022	1,079
2023	881
2024	1,277
2025	1,169

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	1898–2025
Completeness	87.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	8 separate periods inside 1898–2025 hold no value. The longest runs from 1899 to 1907 — 9 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1898 and is not continuous from it: 128 years separate the first value from the last, and 88% 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 Scioto River at Chillicothe OH, 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	Scioto River at Chillicothe OH (mm)
1921	414
1922	318
1923	309
1924	329
1925	151
1926	367
1927	465
1928	287
1929	506
1930	279
1931	203
1932	259
1933	373
1934	72.0
1935	219
1936	242
1937	460
1938	298
1939	296
1940	273
1941	120
1942	210
1943	312
1944	167
1945	374
1946	267
1947	435
1948	396
1949	324
1950	473
1951	379
1952	350
1953	124
1954	93.0
1955	207
1956	273
1957	344
1958	340
1959	329
1960	174
1961	310
1962	236
1963	224
1964	281
1965	234
1966	278
1967	312
1968	307
1969	346
1970	332
1971	245
1972	481
1973	480
1974	377
1975	395
1976	256
1977	261
1978	359
1979	542
1980	404
1981	327
1982	336
1983	302
1984	327
1985	361
1986	379
1987	224
1988	212
1989	455
1990	614
1991	306
1992	276
1993	414
1994	271
1995	393
1996	579
1997	346
1998	334
1999	230
2000	287
2001	284
2002	296
2003	512
2004	487
2005	503
2006	401
2007	425
2008	485
2009	246
2010	280
2011	717
2012	287
2013	407
2014	365
2015	424
2016	315
2017	450
2018	619
2019	575
2020	449
2021	341
2022	437
2023	304
2024	307

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	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1921 to 2024 is held.
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 Lower Scioto and what each holds
Gauge	Measures	Values	Record
Scioto River at Chillicothe OH	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	329	1898–2026
Deer Creek at Williamsport OH	catchment area, annual maximum river flow	66	1927–2026

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 — 05060002. 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
Scioto River at Chillicothe OH	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
Deer Creek at Williamsport OH	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 2 of them, which makes it a profile, not indexed.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	129	yes, 20 or more
Values held	395	no
Distinct measurements	4	yes, 2 or more
Publishers measuring it	1	no
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-03231500.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 Scioto gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-scioto/

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 Scioto 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 confidence2025-04-08

Source: USGS — National Water Information System, USGS site 03231500, 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.