The monitoring network within this area

Hydrionis holds 524 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

524

Values held

1895–2026

Record spans

Gauges within the Lower Republican 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 REPUBLICAN R AT CLAY CENTER, KS

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1903–2025.

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	REPUBLICAN R AT CLAY CENTER, KS (m³/s)
1903	2,379
1915	2,633
1918	137
1919	515
1920	139
1921	138
1922	264
1923	569
1924	161
1925	140
1926	419
1927	456
1928	340
1929	248
1930	275
1931	210
1932	248
1933	204
1934	108
1935	5,522
1936	249
1937	289
1938	419
1939	289
1940	207
1941	1,438
1943	784
1944	629
1945	1,223
1946	728
1947	1,767
1948	541
1949	527
1950	753
1951	1,458
1952	188
1953	185
1954	142
1955	169
1956	121
1957	481
1958	1,583
1959	154
1960	716
1961	578
1962	236
1963	177
1964	413
1965	385
1967	524
1968	286
1969	399
1970	334
1971	597
1972	391
1973	745
1975	249
1976	232
1977	419
1978	243
1979	374
1980	362
1981	323
1982	371
1983	391
1984	348
1985	280
1986	646
1987	799
1988	123
1989	473
1990	351
1991	210
1992	314
1993	1,362
1994	139
1995	365
1996	357
1998	430
2000	90.6
2001	283
2002	58.9
2003	351
2004	158
2005	232
2006	104
2007	345
2008	303
2010	586
2011	821
2012	173
2013	362
2014	125
2015	470
2016	413
2017	368
2018	453
2019	360
2020	651
2021	94.6
2022	206
2023	28.9
2024	163
2025	162

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	1903–2025
Completeness	84.6% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	8 separate periods inside 1903–2025 hold no value. The longest runs from 1904 to 1914 — 11 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1903 and is not continuous from it: 123 years separate the first value from the last, and 85% 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 REPUBLICAN R AT CLAY CENTER, KS, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1918–2025.

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	REPUBLICAN R AT CLAY CENTER, KS (mm)
1918	13.0
1919	27.0
1920	18.0
1921	14.0
1922	13.0
1923	39.0
1924	13.0
1925	13.0
1926	18.0
1927	30.0
1928	30.0
1929	20.0
1930	24.0
1931	13.0
1932	16.0
1933	15.0
1934	8.00
1935	41.0
1936	12.0
1937	14.0
1938	20.0
1939	13.0
1940	10.0
1941	39.0
1942	33.0
1943	21.0
1944	33.0
1945	37.0
1946	32.0
1947	34.0
1948	23.0
1949	35.0
1950	37.0
1951	67.0
1952	18.0
1953	6.00
1954	5.00
1955	5.00
1956	4.00
1957	15.0
1958	24.0
1959	14.0
1960	28.0
1961	23.0
1962	27.0
1963	12.0
1964	8.00
1965	22.0
1966	11.0
1967	22.0
1968	13.0
1969	23.0
1970	12.0
1971	12.0
1972	10.0
1973	48.0
1974	15.0
1975	11.0
1976	6.00
1977	13.0
1978	12.0
1979	19.0
1980	11.0
1981	9.00
1982	21.0
1983	19.0
1984	22.0
1985	17.0
1986	26.0
1987	33.0
1988	7.00
1989	9.00
1990	7.00
1991	4.00
1992	15.0
1993	80.0
1994	14.0
1995	20.0
1996	20.0
1997	12.0
1998	20.0
1999	15.0
2000	4.00
2001	12.0
2002	3.00
2003	6.00
2004	6.00
2005	3.00
2006	2.00
2007	10.0
2008	19.0
2009	9.00
2010	24.0
2011	19.0
2012	8.00
2013	5.00
2014	4.00
2015	14.0
2016	13.0
2017	15.0
2018	16.0
2019	50.0
2020	21.0
2021	9.00
2022	5.00
2023	2.00
2024	4.00
2025	4.00

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	1918–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1918 to 2025 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 Republican and what each holds
Gauge	Measures	Values	Record
REPUBLICAN R AT CLAY CENTER, KS	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	327	1903–2026
REPUBLICAN R AT SCANDIA, KS	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	169	1915–2026
REPUBLICAN R AT MILFORD, KS	catchment area, annual maximum river flow	28	1895–2026

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 — 10250017. 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
REPUBLICAN R AT CLAY CENTER, KS	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
REPUBLICAN R AT SCANDIA, KS	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
REPUBLICAN R AT MILFORD, KS	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	132	yes, 20 or more
Values held	524	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-06856600.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 Republican gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-republican/

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 Republican 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 confidence2025-07-26

Source: USGS — National Water Information System, USGS site 06856600, 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.