The monitoring network within this area

Hydrionis holds 299 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

299

Values held

1903–2026

Record spans

Gauges within the Upper Little Missouri 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 LITTLE MISSOURI RIVER AT CAMP CROOK, SD

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1952–2024.

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	LITTLE MISSOURI RIVER AT CAMP CROOK, SD (m³/s)
1952	0
1956	90.9
1957	58.9
1958	34.0
1959	66.5
1960	95.1
1961	10.2
1962	215
1963	96.8
1964	40.8
1965	113
1966	52.4
1967	159
1968	44.5
1969	104
1970	38.8
1971	126
1972	105
1973	50.7
1974	25.6
1975	240
1976	136
1977	51.8
1978	267
1979	73.3
1980	1.64
1981	19.6
1982	193
1983	85.5
1984	85.0
1985	104
1986	154
1987	63.4
1988	4.16
1989	43.3
1990	62.9
1991	8.69
1992	15.9
1993	112
1994	56.6
1995	209
1996	101
1997	79.3
1998	53.8
1999	52.7
2000	2.24
2001	60.9
2002	1.30
2003	21.2
2004	28.9
2005	23.6
2006	151
2007	51.3
2008	133
2009	351
2010	71.4
2011	569
2012	9.71
2013	62.9
2014	226
2015	59.7
2016	12.3
2017	23.4
2018	136
2019	241
2020	58.0
2021	1.82
2022	86.1
2023	51.0
2024	6.65

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	1952–2024
Completeness	95.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1952–2024 holds no value: 1953 to 1955, 3 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1952 and is not continuous from it: 73 years separate the first value from the last, and 96% 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 LITTLE MISSOURI RIVER AT CAMP CROOK, SD, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1904–2023.

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	LITTLE MISSOURI RIVER AT CAMP CROOK, SD (mm)
1904	27.0
1905	37.0
1957	9.00
1958	8.00
1959	10.0
1960	17.0
1961	1.00
1962	49.0
1963	32.0
1964	10.0
1965	24.0
1966	4.00
1967	40.0
1968	9.00
1969	31.0
1970	17.0
1971	71.0
1972	39.0
1973	13.0
1974	7.00
1975	32.0
1976	19.0
1977	16.0
1978	78.0
1979	19.0
1980	1.00
1981	4.00
1982	34.0
1983	15.0
1984	21.0
1985	10.0
1986	40.0
1987	9.00
1988	2.00
1989	8.00
1990	11.0
1991	3.00
1992	3.00
1993	31.0
1994	21.0
1995	33.0
1996	57.0
1997	43.0
1998	13.0
1999	23.0
2000	2.00
2001	23.0
2002	1.00
2003	2.00
2004	5.00
2005	2.00
2006	20.0
2007	20.0
2008	46.0
2009	66.0
2010	33.0
2011	102
2012	3.00
2013	18.0
2014	36.0
2015	12.0
2016	3.00
2017	5.00
2018	24.0
2019	66.0
2020	16.0
2021	2.00
2022	15.0
2023	18.0

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	1904–2023
Completeness	57.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1904–2023 holds no value: 1906 to 1956, 51 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1904 and is not continuous from it: 120 years separate the first value from the last, and 57% 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 Upper Little Missouri and what each holds
Gauge	Measures	Values	Record
LITTLE MISSOURI RIVER AT CAMP CROOK, SD	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	247	1903–2026
Little Missouri River near Alzada MT	catchment area, annual maximum river flow	52	1912–2026

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 — 10110201. 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
LITTLE MISSOURI RIVER AT CAMP CROOK, SD	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
Little Missouri River near Alzada MT	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 3 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	124	yes, 20 or more
Values held	299	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-06334500.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), Upper Little Missouri gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-little-missouri/

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 Upper Little Missouri 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 confidence2024-05-12

Source: USGS — National Water Information System, USGS site 06334500, 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.