The monitoring network within this area

Hydrionis holds 376 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

376

Values held

1898–2026

Record spans

Gauges within the Palouse 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 PALOUSE RIVER AT HOOPER, WA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1899–2024.

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	PALOUSE RIVER AT HOOPER, WA (m³/s)
1899	172
1901	258
1902	118
1903	297
1904	470
1905	23.7
1906	75.0
1907	269
1909	501
1910	844
1911	108
1912	94.3
1913	476
1914	149
1915	75.6
1916	549
1948	699
1951	270
1952	340
1953	196
1954	121
1955	117
1957	314
1958	220
1959	323
1960	113
1961	261
1962	190
1963	949
1964	96.8
1965	484
1966	72.8
1967	112
1968	216
1969	294
1970	248
1971	275
1972	476
1973	541
1974	617
1975	200
1976	187
1977	19.1
1978	140
1979	654
1980	133
1981	200
1982	362
1983	215
1984	408
1985	139
1986	203
1987	140
1988	132
1989	264
1990	168
1991	317
1992	90.3
1993	136
1994	28.9
1995	215
1996	793
1997	637
1998	94.6
2000	211
2001	66.0
2002	172
2003	188
2004	118
2005	85.5
2006	137
2007	176
2008	113
2009	263
2010	118
2011	207
2012	300
2013	67.4
2014	225
2015	129
2017	388
2019	345
2020	133
2021	115
2022	237
2024	55.2

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	1899–2024
Completeness	68.3% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	9 separate periods inside 1899–2024 hold no value. The longest runs from 1917 to 1947 — 31 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1899 and is not continuous from it: 126 years separate the first value from the last, and 68% of the years between them are held. The span is not the record.
Last read from the publisher	2026-08-31
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 PALOUSE RIVER AT HOOPER, 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. 1898–2025.

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	PALOUSE RIVER AT HOOPER, WA (mm)
1898	124
1899	82.0
1901	124
1902	70.0
1903	118
1904	116
1905	24.0
1906	63.0
1909	73.0
1910	143
1911	38.0
1914	53.0
1915	33.0
1952	108
1953	89.0
1954	65.0
1955	86.0
1956	124
1957	85.0
1958	96.0
1959	110
1960	61.0
1961	96.0
1962	54.0
1963	59.0
1964	77.0
1965	105
1966	36.0
1967	56.0
1968	39.0
1969	119
1970	91.0
1971	89.0
1972	145
1973	61.0
1974	170
1975	121
1976	100
1977	22.0
1978	60.0
1979	99.0
1980	55.0
1981	60.0
1982	129
1983	99.0
1984	106
1985	74.0
1986	83.0
1987	34.0
1988	30.0
1989	78.0
1990	65.0
1991	63.0
1992	24.0
1993	74.0
1994	23.0
1995	90.0
1996	168
1997	209
1998	86.0
1999	120
2000	97.0
2001	38.0
2002	89.0
2003	62.0
2004	55.0
2005	30.0
2006	77.0
2007	62.0
2008	80.0
2009	113
2010	38.0
2011	125
2012	103
2013	62.0
2014	63.0
2015	46.0
2016	69.0
2017	157
2018	121
2019	83.0
2020	55.0
2021	52.0
2022	81.0
2023	55.0
2024	45.0
2025	65.0

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	1898–2025
Completeness	68.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	4 separate periods inside 1898–2025 hold no value. The longest runs from 1916 to 1951 — 36 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1898 and is not continuous from it: 128 years separate the first value from the last, and 68% of the years between them are held. The span is not the record.
Last read from the publisher	2026-08-24
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 Palouse and what each holds
Gauge	Measures	Values	Record
PALOUSE RIVER AT HOOPER, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	214	1898–2026
PALOUSE RIVER NR POTLATCH, ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	162	1915–2026

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 — 17060108. 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
PALOUSE RIVER AT HOOPER, 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	2026-08-26
PALOUSE RIVER NR POTLATCH, ID	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	2026-08-26

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	129	yes, 20 or more
Values held	376	no
Distinct measurements	4	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-13351000.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), Palouse gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-palouse/

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 Palouse 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 confidence2024-03-02

Source: USGS — National Water Information System, USGS site 13351000, 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 31 August 2026.