The monitoring network within this area

Hydrionis holds 350 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

350

Values held

1923–2026

Record spans

Gauges within the Colville 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 COLVILLE RIVER AT KETTLE FALLS, WA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1923–2025.

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	COLVILLE RIVER AT KETTLE FALLS, WA (m³/s)
1923	25.9
1924	11.9
1925	36.5
1926	8.07
1927	36.2
1928	35.7
1929	10.1
1930	6.23
1931	6.71
1932	49.8
1933	43.6
1934	29.4
1935	39.1
1936	21.3
1937	19.9
1938	76.2
1939	17.6
1940	41.1
1941	26.4
1942	36.0
1943	27.6
1944	13.3
1945	30.0
1946	48.4
1947	18.9
1948	63.4
1949	48.7
1950	38.8
1951	63.4
1952	72.2
1953	47.0
1954	29.7
1955	28.0
1956	91.5
1957	45.0
1958	49.6
1959	31.7
1960	65.1
1961	66.3
1962	25.7
1963	30.3
1964	20.8
1965	52.1
1966	22.9
1967	29.4
1968	16.5
1969	74.5
1970	21.1
1971	44.2
1972	28.3
1973	22.8
1974	97.4
1975	64.0
1976	24.4
1977	8.13
1978	35.4
1979	26.0
1980	29.2
1981	23.0
1982	36.5
1983	61.4
1984	51.5
1985	26.9
1986	23.0
1987	29.2
1988	14.2
1989	34.3
1990	52.4
1991	24.6
1992	12.9
1993	22.8
1994	22.5
1995	50.1
1996	58.6
1997	81.0
1998	66.8
1999	52.1
2000	57.8
2001	27.4
2002	48.7
2003	42.8
2004	20.3
2005	20.7
2006	57.2
2007	26.2
2008	31.7
2009	25.1
2010	32.8
2011	60.6
2012	58.6
2013	49.8
2014	28.3
2015	30.9
2016	45.9
2017	89.5
2018	60.9
2019	27.8
2020	29.7
2021	27.4
2022	26.8
2023	39.1
2024	25.4
2025	29.4

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	1923–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1923 to 2025 is held.
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 COLVILLE RIVER AT KETTLE FALLS, WA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1923–2025.

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	COLVILLE RIVER AT KETTLE FALLS, WA (mm)
1923	84.0
1924	43.0
1925	92.0
1926	42.0
1927	131
1928	127
1929	38.0
1930	23.0
1931	25.0
1933	104
1934	108
1935	103
1936	50.0
1937	61.0
1938	167
1939	55.0
1940	86.0
1941	116
1942	137
1943	81.0
1944	47.0
1945	90.0
1946	119
1947	69.0
1948	168
1949	127
1950	133
1951	181
1952	161
1953	114
1954	97.0
1955	94.0
1956	169
1957	93.0
1958	146
1959	138
1960	151
1961	176
1962	98.0
1963	85.0
1964	70.0
1965	111
1966	73.0
1967	105
1968	69.0
1969	170
1970	80.0
1971	118
1972	96.0
1973	81.0
1974	250
1975	152
1976	94.0
1977	33.0
1978	96.0
1979	56.0
1980	89.0
1981	102
1982	130
1983	173
1984	177
1985	78.0
1986	73.0
1987	70.0
1988	46.0
1989	75.0
1990	87.0
1991	86.0
1992	46.0
1993	80.0
1994	65.0
1995	132
1996	147
1997	244
1998	167
1999	198
2000	146
2001	53.0
2002	102
2003	114
2004	51.0
2005	54.0
2006	135
2007	72.0
2008	79.0
2009	62.0
2010	76.0
2011	162
2012	159
2013	127
2014	85.0
2015	68.0
2016	123
2017	227
2018	157
2019	80.0
2020	114
2021	69.0
2022	85.0
2023	99.0
2024	93.0
2025	80.0

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	1923–2025
Completeness	99.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1923–2025 holds no value: 1932. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1923 and is not continuous from it: 103 years separate the first value from the last, and 99% 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 Colville and what each holds
Gauge	Measures	Values	Record
COLVILLE RIVER AT KETTLE FALLS, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	343	1923–2026
COLVILLE RIVER AT BLUE CREEK, WA	catchment area, annual maximum river flow	7	1961–2026

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 — 17020003. 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
COLVILLE RIVER AT KETTLE FALLS, WA	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
COLVILLE RIVER AT BLUE CREEK, WA	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	1	no
Years spanned	104	yes, 20 or more
Values held	350	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-12409000.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), Colville gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-colville/

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 Colville 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 confidence2025-04-09

Source: USGS — National Water Information System, USGS site 12409000, 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.