The monitoring network within this area

Hydrionis holds 1,069 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

1,069

Values held

1893–2026

Record spans

Gauges within the Lower Great Miami, Indiana, Ohio 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 Great Miami River at Dayton OH

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	Great Miami River at Dayton OH (m³/s)
1893	1,642
1894	368
1895	283
1896	623
1897	1,727
1898	2,605
1899	821
1900	595
1901	425
1902	368
1903	991
1904	1,472
1905	878
1906	1,189
1907	1,529
1908	1,699
1909	1,303
1910	1,614
1912	1,416
1913	7,079
1914	646
1915	762
1916	1,365
1917	844
1918	929
1919	1,017
1920	1,693
1921	1,201
1922	1,104
1923	464
1924	1,351
1925	445
1926	643
1927	1,237
1929	1,501
1930	1,102
1931	258
1932	586
1933	1,337
1934	303
1935	504
1936	767
1937	1,371
1938	824
1939	711
1940	725
1941	136
1942	547
1943	1,011
1944	838
1945	810
1946	476
1947	1,042
1948	886
1949	892
1950	1,019
1951	985
1952	1,320
1953	513
1954	311
1955	487
1957	940
1958	1,155
1959	1,724
1960	360
1961	733
1962	663
1963	1,345
1964	994
1965	606
1966	456
1968	691
1969	691
1970	776
1971	629
1972	538
1974	654
1975	1,099
1976	544
1977	527
1978	739
1979	728
1980	850
1981	637
1982	736
1983	583
1984	481
1985	705
1986	833
1988	362
1989	847
1990	736
1992	665
1993	688
1994	739
1995	1,005
1996	866
1997	906
1998	597
1999	762
2000	674
2001	561
2003	1,034
2004	1,008
2005	1,297
2006	592
2007	1,025
2008	937
2009	552
2010	705
2011	977
2013	609
2015	680
2017	589
2018	1,223
2019	1,051
2020	804
2021	671
2022	807
2023	833
2025	1,209

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	91.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	12 separate periods inside 1893–2025 hold no value. 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 91% 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 Twin Creek near Germantown 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	Twin Creek near Germantown OH (mm)
1921	539
1922	409
1923	326
1927	546
1928	264
1929	568
1930	351
1931	131
1932	325
1933	470
1934	81.0
1935	162
1936	316
1937	537
1938	426
1939	345
1940	203
1941	131
1942	260
1943	308
1944	170
1945	342
1946	210
1947	406
1948	331
1949	396
1950	718
1951	460
1952	382
1953	151
1954	59.0
1955	311
1956	233
1957	390
1958	460
1959	374
1960	119
1961	375
1962	247
1963	209
1964	260
1965	234
1966	281
1967	371
1968	383
1969	332
1970	245
1971	217
1972	389
1973	462
1974	379
1975	405
1976	172
1977	265
1978	343
1979	593
1980	390
1981	291
1982	472
1983	301
1984	369
1985	408
1986	465
1987	191
1988	162
1989	432
1990	631
1991	303
1992	248
1993	418
1994	231
1995	305
1996	692
1997	304
1998	374
1999	221
2000	252
2001	409
2002	455
2003	552
2004	399
2005	509
2006	572
2007	444
2008	550
2009	323
2010	329
2011	759
2012	215
2013	440
2014	362
2015	459
2017	479
2018	678
2019	559
2020	404
2021	428
2022	424
2023	192
2024	352

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	96.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	2 separate periods inside 1921–2024 hold no value. The longest runs from 1924 to 1926 — 3 years with no reading. They are drawn as breaks in the line and are 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 96% 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 Lower Great Miami, Indiana, Ohio and what each holds
Gauge	Measures	Values	Record
Great Miami River at Hamilton OH	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	315	1907–2026
Twin Creek near Germantown OH	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	310	1913–2026
Great Miami River at Dayton OH	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	236	1893–2026
Great Miami River at Miamisburg OH	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	208	1913–2026

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 — 05080002. 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
Great Miami River at Hamilton 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
Twin Creek near Germantown 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
Great Miami River at Dayton 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
Great Miami River at Miamisburg 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 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	4	yes, 3 or more
Years spanned	134	yes, 20 or more
Values held	1,069	yes, 1000 or more
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-03274000.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 Great Miami, Indiana, Ohio gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-great-miami-indiana-ohio/

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 Great Miami, Indiana, Ohio 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 confidence2025-04-05

Source: USGS — National Water Information System, USGS site 03274000, 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.