The monitoring network within this area

Hydrionis holds 536 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

536

Values held

1891–2026

Record spans

Gauges within the Upper Spokane 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 Spokane River at Spokane, WA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1891–2025.

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	Spokane River at Spokane, WA (m³/s)
1891	362
1892	617
1893	1,062
1894	1,388
1895	484
1896	606
1902	702
1904	790
1905	269
1907	606
1908	614
1909	501
1913	951
1914	555
1915	326
1916	804
1917	1,186
1918	1,121
1919	697
1920	515
1921	742
1922	745
1923	623
1924	504
1925	898
1926	447
1927	799
1928	753
1929	416
1930	365
1931	447
1932	949
1933	807
1935	719
1936	954
1937	626
1938	926
1939	660
1940	467
1941	456
1942	521
1943	917
1944	323
1945	646
1946	804
1948	1,121
1949	968
1950	926
1951	799
1952	909
1953	634
1954	878
1955	765
1956	1,070
1957	1,008
1958	691
1959	750
1960	776
1961	799
1962	782
1964	900
1965	940
1966	586
1967	725
1968	651
1969	861
1970	668
1971	963
1972	974
1973	348
1974	1,291
1975	915
1976	889
1977	215
1978	651
1979	883
1980	552
1982	1,087
1983	561
1984	592
1985	748
1986	671
1987	490
1988	544
1989	765
1990	677
1992	306
1993	612
1994	459
1995	677
1996	1,034
1997	1,206
1998	467
1999	651
2000	821
2001	476
2002	889
2003	501
2004	433
2006	595
2007	654
2008	1,155
2009	629
2010	481
2011	954
2012	1,036
2013	549
2014	753
2015	637
2016	515
2017	1,215
2018	787
2019	597
2020	555
2021	385
2022	697
2023	682
2024	326
2025	552

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	1891–2025
Completeness	88.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	10 separate periods inside 1891–2025 hold no value. The longest runs from 1897 to 1901 — 5 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1891 and is not continuous from it: 135 years separate the first value from the last, and 88% 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 Spokane River at Spokane, 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. 1892–2025.

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	Spokane River at Spokane, WA (mm)
1892	480
1893	619
1894	774
1895	409
1896	757
1897	740
1898	741
1899	783
1900	636
1901	646
1902	613
1903	673
1904	583
1905	322
1906	456
1907	564
1908	435
1909	508
1910	623
1911	429
1912	533
1913	669
1914	458
1915	294
1916	711
1917	694
1918	628
1919	508
1920	407
1921	675
1922	419
1923	517
1924	397
1925	623
1926	388
1927	801
1928	577
1929	275
1930	267
1931	308
1932	688
1933	761
1934	677
1935	529
1936	444
1937	411
1938	532
1939	384
1940	413
1941	334
1942	387
1943	575
1944	226
1945	440
1946	642
1947	546
1948	696
1949	593
1950	857
1951	612
1952	514
1953	534
1954	626
1955	569
1956	734
1957	585
1958	567
1959	723
1960	557
1961	630
1962	543
1963	421
1964	632
1965	658
1966	416
1967	528
1968	480
1969	600
1970	517
1971	672
1972	777
1973	331
1974	935
1975	595
1976	591
1977	270
1978	488
1979	434
1980	424
1981	504
1982	670
1983	554
1984	570
1985	473
1986	460
1987	314
1988	303
1989	507
1990	649
1991	565
1992	290
1993	423
1994	256
1995	638
1996	674
1997	841
1998	425
1999	619
2000	533
2001	251
2002	619
2003	392
2004	427
2005	335
2006	567
2007	442
2008	588
2009	497
2010	377
2011	786
2012	687
2013	430
2014	539
2015	380
2016	492
2017	717
2018	607
2019	377
2020	430
2021	350
2022	537
2023	338
2024	340
2025	424

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	1892–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1892 to 2025 is held.
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 Upper Spokane and what each holds
Gauge	Measures	Values	Record
Spokane River at Spokane, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	296	1891–2026
Spokane River near Post Falls, ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	240	1913–2026

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 — 17010305. 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
Spokane River at Spokane, 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
Spokane River near Post Falls, 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	136	yes, 20 or more
Values held	536	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-12422500.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 Spokane gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-upper-spokane/

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 Spokane 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 confidence2025-04-01

Source: USGS — National Water Information System, USGS site 12422500, 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.