The monitoring network within this area

Hydrionis holds 1,344 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

1,344

Values held

1911–2026

Record spans

Gauges within the St. Joe 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 ST JOE RIVER AT CALDER, ID

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1911–2025.

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	ST JOE RIVER AT CALDER, ID (m³/s)
1911	408
1912	445
1921	493
1922	498
1923	385
1924	371
1925	487
1926	326
1927	510
1928	470
1929	265
1930	241
1931	249
1932	493
1933	555
1935	379
1936	566
1937	360
1938	1,303
1939	391
1940	230
1941	150
1943	419
1944	155
1945	439
1946	430
1948	671
1949	544
1950	521
1951	487
1952	459
1953	385
1954	578
1955	515
1956	583
1957	473
1958	396
1959	430
1960	382
1961	439
1962	470
1964	541
1966	408
1967	515
1968	396
1969	470
1970	416
1971	651
1972	612
1973	184
1974	934
1975	470
1976	612
1977	191
1979	595
1980	362
1982	674
1983	360
1984	408
1985	405
1986	419
1987	377
1988	360
1989	402
1990	680
1992	198
1993	394
1994	254
1995	595
1996	1,110
1997	711
1998	264
1999	473
2000	436
2001	227
2002	668
2003	513
2004	270
2006	388
2008	654
2009	388
2010	221
2011	646
2012	586
2013	396
2014	479
2015	388
2016	289
2017	640
2018	566
2019	371
2020	351
2021	261
2022	481
2023	479
2024	180
2025	281

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	1911–2025
Completeness	84.3% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	11 separate periods inside 1911–2025 hold no value. The longest runs from 1913 to 1920 — 8 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1911 and is not continuous from it: 115 years separate the first value from the last, and 84% 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 ST JOE RIVER AT CALDER, 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. 1921–2025.

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	ST JOE RIVER AT CALDER, ID (mm)
1921	1,024
1922	662
1923	764
1924	624
1925	1,023
1926	602
1927	1,185
1928	870
1929	459
1930	492
1931	456
1932	941
1933	1,216
1934	970
1935	729
1936	691
1937	548
1938	807
1939	596
1940	582
1941	486
1942	574
1943	877
1944	342
1945	633
1946	897
1947	859
1948	997
1949	800
1950	1,212
1951	847
1952	671
1953	730
1954	946
1955	874
1956	1,059
1957	809
1958	793
1959	1,064
1960	757
1961	862
1962	836
1963	606
1964	888
1965	907
1966	641
1967	786
1968	780
1969	836
1970	773
1971	1,072
1972	1,173
1973	464
1974	1,262
1975	847
1976	878
1977	507
1978	745
1979	684
1980	764
1981	734
1982	976
1983	815
1984	779
1985	795
1986	733
1987	494
1988	511
1989	792
1990	973
1991	892
1992	479
1993	638
1994	434
1995	985
1996	986
1997	1,244
1998	623
1999	884
2000	747
2001	396
2002	927
2003	643
2004	685
2005	564
2006	841
2007	653
2008	881
2009	727
2010	527
2011	1,138
2012	967
2013	622
2014	850
2015	542
2016	711
2017	993
2018	885
2019	559
2020	680
2021	566
2022	820
2023	530
2024	512
2025	691

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	1921–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1921 to 2025 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

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

483

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

59

Thinnest, in 2026 (mm of water)

February

Month the pack is usually at its fullest

May

Month the pack has gone by, in half of years

Peak snowpack at Sherwin

Water years 1983–2026. 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	Sherwin (mm)
1983	192
1984	258
1985	387
1986	228
1987	162
1988	179
1989	416
1990	304
1991	183
1992	137
1993	250
1994	191
1995	214
1996	178
1997	483
1998	187
2000	326
2001	221
2002	451
2003	97.0
2004	277
2005	63.0
2006	218
2007	236
2008	401
2009	252
2010	100
2011	325
2012	299
2013	161
2014	188
2015	90.0
2016	181
2017	233
2018	248
2019	241
2020	252
2021	256
2022	244
2023	298
2024	113
2025	137
2026	59.0

Read against the river

Sherwin and ST JOE RIVER AT CALDER, ID both sit in this drainage area, and their records overlap by 42 years. That is the span the two have in common, not a count of years both actually hold — either record may have gaps inside it. The two are shown separately rather than on one axis: millimetres of stored water and cubic metres per second are not commensurable, and a difference between them would mean nothing.

Being in the same drainage area does not put the snowpack upstream of the gauge. A subbasin is an area, and snow on one tributary can join the river below a gauge on another — so a weak relationship here may say more about which tributary was measured than about the snow.

Every gauge Hydrionis holds within this area

Gauges within the St. Joe and what each holds
Gauge	Measures	Values	Record
ST JOE RIVER AT CALDER, ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	353	1911–2026
ST MARIES RIVER AT LOTUS ID	catchment area, annual maximum river flow	29	1921–2026

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 — 17010304. 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
ST JOE RIVER AT CALDER, 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
ST MARIES RIVER AT LOTUS 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	1	no
Years spanned	116	yes, 20 or more
Values held	1,344	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-12414500.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), St. Joe gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-st-joe/

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 St. Joe 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 confidence2025-03-28

Source: USGS — National Water Information System, USGS site 12414500, 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.