The monitoring network within this area

Hydrionis holds 773 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.

2

Gauges

773

Values held

1923–2026

Record spans

Gauges within the Middle Little Colorado 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 CLEAR CREEK NEAR WINSLOW, AZ

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1929–2006.

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	CLEAR CREEK NEAR WINSLOW, AZ (m³/s)
1929	1,416
1930	30.6
1931	24.1
1932	173
1933	22.1
1936	47.6
1937	79.0
1938	742
1939	42.5
1940	52.1
1941	93.4
1942	54.9
1943	42.5
1944	42.5
1945	63.1
1946	31.1
1948	51.3
1949	55.8
1950	28.3
1951	242
1952	637
1953	19.7
1954	164
1955	30.6
1956	4.90
1957	259
1958	82.7
1959	69.1
1961	26.2
1962	66.0
1963	24.9
1964	30.0
1965	168
1966	354
1968	52.1
1969	161
1970	273
1971	41.3
1972	265
1974	15.2
1975	112
1976	60.0
1977	10.5
1978	365
1980	306
1981	16.1
1982	16.1
2005	1.05
2006	0.425

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	1929–2006
Completeness	62.8% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	7 separate periods inside 1929–2006 hold no value. The longest runs from 1983 to 2004 — 22 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1929 and is not continuous from it: 78 years separate the first value from the last, and 63% 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 CLEAR CREEK NEAR WINSLOW, AZ, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1930–1982.

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 (0 events)

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	CLEAR CREEK NEAR WINSLOW, AZ (mm)
1930	23.0
1931	37.0
1932	111
1933	29.0
1936	36.0
1937	90.0
1938	50.0
1939	23.0
1940	31.0
1941	123
1942	38.0
1943	33.0
1944	56.0
1945	58.0
1946	20.0
1947	12.0
1948	41.0
1949	79.0
1950	18.0
1951	22.0
1952	111
1953	14.0
1954	21.0
1955	14.0
1956	7.00
1957	60.0
1958	48.0
1959	15.0
1960	50.0
1961	11.0
1962	62.0
1963	8.00
1964	20.0
1965	89.0
1966	72.0
1967	3.00
1968	72.0
1969	51.0
1970	16.0
1971	21.0
1972	24.0
1973	128
1974	11.0
1975	29.0
1976	48.0
1977	3.00
1978	141
1979	107
1980	116
1981	8.00
1982	69.0

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	Derived Computed by Hydrionis
Period held	1930–1982
Completeness	96.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1930–1982 holds no value: 1934 to 1935, 2 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1930 and is not continuous from it: 53 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

The snow standing above this water

1 automated snow station sits inside this drainage area, weighing the snowpack rather than measuring how deep it is.

680

Fullest snowpack recorded at Promontory, in 2010 (mm of water)

20

Thinnest, in 2026 (mm of water)

February

Month the pack is usually at its fullest

April

Month the pack has gone by, in half of years

Peak snowpack at Promontory

Water years 1981–2026. Each point is the fullest month of that snow season.

A water year runs October to September and is named for the year it ends, so the snow of one winter stays in one point. The value is the fullest month, not the fullest day: a pack that peaked sharply mid-month reads lower here than a single measurement taken at the right moment would.

View the data behind this chart

Underlying data
Period	Promontory (mm)
1981	210
1984	199
1985	669
1986	130
1987	351
1988	320
1989	234
1990	237
1991	570
1992	521
1993	593
1994	316
1995	386
1996	47.0
1997	252
1998	480
1999	78.0
2000	94.0
2001	258
2002	88.0
2003	307
2004	186
2005	417
2006	67.0
2007	249
2008	412
2009	430
2010	680
2011	198
2012	204
2013	270
2014	59.0
2015	74.0
2016	291
2017	301
2018	58.0
2019	318
2020	175
2021	168
2022	163
2023	451
2024	204
2025	26.0
2026	20.0

Why the snow is not read against the river here

Peak snow water equivalent and Mean river flow, water year overlap for only 1 year at these subjects. A relationship read off a span that short is reading the weather of a few seasons.

Every gauge Hydrionis holds within this area

Gauges within the Middle Little Colorado and what each holds
Gauge	Measures	Values	Record
CLEAR CREEK NEAR WINSLOW, AZ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	193	1929–2026
LITTLE COLORADO RIVER AT HOLBROOK, AZ	catchment area, annual maximum river flow	52	1923–2026

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 — 15020008. 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
CLEAR CREEK NEAR WINSLOW, AZ	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 COLORADO RIVER AT HOLBROOK, AZ	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	104	yes, 20 or more
Values held	773	no
Distinct measurements	6	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-09399000.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), Middle Little Colorado gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-middle-little-colorado/

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 Middle Little Colorado 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 confidence2006-08-17

Source: USGS — National Water Information System, USGS site 09399000, 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.