The monitoring network within this area

Hydrionis holds 1,507 values from 3 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.

3

Gauges

1,507

Values held

1910–2026

Record spans

Gauges within the Clearwater huc8 subbasin

3 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 CLEARWATER RIVER AT SPALDING ID

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1924–2024.

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	CLEARWATER RIVER AT SPALDING ID (m³/s)
1924	2,435
1925	2,489
1926	1,767
1927	3,087
1928	3,030
1929	2,183
1930	1,489
1931	2,025
1932	3,426
1933	3,851
1935	2,050
1936	3,030
1937	1,540
1938	3,794
1939	2,195
1940	1,591
1941	1,124
1942	1,540
1943	2,469
1944	1,441
1945	2,254
1946	1,858
1947	3,228
1948	5,012
1949	3,483
1950	2,860
1951	2,090
1952	2,546
1953	2,296
1954	2,945
1955	2,860
1956	3,426
1957	4,049
1958	2,582
1959	2,379
1960	2,237
1961	2,602
1962	2,146
1963	1,634
1964	3,993
1966	1,880
1967	2,772
1968	1,928
1969	2,104
1970	2,631
1971	3,002
1972	2,667
1973	1,045
1974	3,710
1975	2,246
1976	2,229
1977	898
1978	1,665
1979	1,894
1980	1,481
1981	1,880
1982	1,877
1983	1,727
1984	2,308
1985	1,722
1986	1,999
1987	1,472
1988	1,311
1989	1,498
1990	1,996
1991	1,903
1992	1,195
1993	2,025
1994	1,184
1995	1,566
1996	2,628
1997	2,410
1998	1,608
1999	1,787
2001	1,266
2002	1,965
2003	1,934
2004	2,019
2005	1,478
2006	1,897
2007	1,303
2008	2,260
2009	1,897
2010	1,985
2011	2,404
2012	2,302
2013	1,866
2014	1,807
2015	1,215
2016	1,659
2017	2,888
2018	2,010
2019	2,656
2020	1,801
2021	1,288
2022	2,860
2023	1,770
2024	1,334

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	1924–2024
Completeness	97.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	3 separate periods inside 1924–2024 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1924 and is not continuous from it: 101 years separate the first value from the last, and 97% 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 CLEARWATER RIVER AT KAMIAH ID, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1911–1964.

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	CLEARWATER RIVER AT KAMIAH ID (mm)
1911	549
1912	736
1913	754
1914	545
1915	396
1916	689
1917	810
1918	699
1919	412
1920	626
1921	789
1922	565
1923	527
1924	467
1925	683
1926	473
1927	888
1928	731
1929	429
1930	429
1931	361
1932	636
1933	707
1934	554
1935	419
1936	526
1937	358
1938	520
1939	441
1940	429
1941	400
1942	474
1943	713
1944	344
1945	490
1946	610
1947	676
1948	764
1949	670
1950	763
1951	610
1952	559
1953	539
1954	584
1955	622
1956	703
1957	626
1958	575
1959	767
1960	557
1961	525
1962	590
1963	490
1964	711

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	1911–1964
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1911 to 1964 is held.
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

3 automated snow stations sit inside this drainage area, weighing the snowpack rather than measuring how deep it is.

1,044

Fullest snowpack recorded at Shanghi Summit, in 1997 (mm of water)

182

Thinnest, in 2005 (mm of water)

March

Month the pack is usually at its fullest

June

Month the pack has gone by, in half of years

Peak snowpack at Shanghi Summit

Water years 1985–2026. 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	Shanghi Summit (mm)
1985	855
1986	484
1987	455
1988	422
1989	839
1990	603
1991	542
1992	421
1993	560
1994	451
1995	479
1996	424
1997	1,044
1998	566
1999	948
2000	822
2001	464
2002	899
2003	491
2004	788
2005	182
2006	646
2007	530
2008	1,008
2009	686
2010	346
2011	864
2012	691
2013	418
2014	613
2015	229
2016	539
2017	608
2018	582
2019	605
2020	645
2021	756
2022	557
2023	696
2024	321
2025	611
2026	263

Why the snow is not read against the river here

These two series do not overlap in time: Peak snow water equivalent runs 1984–2026 and Mean river flow, water year runs 1910–1964.

Every gauge Hydrionis holds within this area

Gauges within the Clearwater and what each holds
Gauge	Measures	Values	Record
CLEARWATER RIVER AT SPALDING ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	244	1924–2026
CLEARWATER RIVER AT KAMIAH ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	181	1910–2026
LOLO CREEK NR GREER ID	catchment area, annual maximum river flow	47	1980–2026

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 — 17060306. 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
CLEARWATER RIVER AT SPALDING 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	2026-10-02
CLEARWATER RIVER AT KAMIAH 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	2026-10-02
LOLO CREEK NR GREER 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	2026-10-02

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 4 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	117	yes, 20 or more
Values held	1,507	yes, 1000 or more
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-13342500.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), Clearwater gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-clearwater/

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 Clearwater 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 confidence2024-06-04

Source: USGS — National Water Information System, USGS site 13342500, 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.