The monitoring network within this area

Hydrionis holds 4,810 values from 9 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.

9

Gauges

4,810

Values held

1912–2026

Record spans

Gauges within the Big Wood huc8 subbasin

9 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 BIG WOOD RIVER BL MAGIC DAM NR RICHFIELD ID

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1914–2025.

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	BIG WOOD RIVER BL MAGIC DAM NR RICHFIELD ID (m³/s)
1914	71.4
1916	74.8
1917	109
1919	44.5
1920	50.4
1921	120
1924	45.3
1925	71.1
1926	40.2
1927	96.0
1929	34.5
1930	39.1
1931	31.7
1932	55.2
1933	39.1
1934	19.1
1938	159
1940	25.9
1941	32.3
1942	75.9
1943	203
1944	42.2
1945	35.1
1946	115
1947	50.7
1948	29.4
1949	44.7
1950	66.8
1951	120
1952	283
1953	68.0
1954	49.0
1955	38.8
1956	127
1957	104
1958	127
1959	25.9
1960	28.9
1961	28.3
1962	51.5
1963	62.6
1964	45.3
1965	123
1966	139
1967	106
1968	27.0
1969	144
1970	62.6
1971	140
1972	101
1973	32.3
1974	113
1975	111
1976	60.6
1977	25.2
1978	80.4
1979	29.2
1980	88.6
1981	49.8
1982	116
1983	191
1984	166
1985	65.1
1986	143
1988	27.3
1989	32.3
1990	31.1
1991	33.4
1993	89.8
1994	29.4
1995	110
1996	111
1998	85.0
1999	111
2000	28.6
2001	25.7
2002	28.2
2006	175
2014	29.4
2015	25.8
2016	28.9
2017	216
2018	68.8
2019	107
2020	25.7
2021	27.0
2022	28.6
2023	106
2024	34.8
2025	37.1

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	1914–2025
Completeness	80.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	11 separate periods inside 1914–2025 hold no value. The longest runs from 2007 to 2013 — 7 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1914 and is not continuous from it: 112 years separate the first value from the last, and 80% 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 BIG WOOD RIVER BL MAGIC DAM NR RICHFIELD 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. 1913–2024.

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	BIG WOOD RIVER BL MAGIC DAM NR RICHFIELD ID (mm)
1913	101
1914	128
1915	65.0
1916	139
1917	156
1918	89.0
1919	71.0
1920	32.0
1921	137
1922	140
1923	106
1924	37.0
1925	113
1926	55.0
1927	122
1928	92.0
1929	33.0
1930	45.0
1931	20.0
1932	51.0
1933	63.0
1934	46.0
1935	47.0
1936	50.0
1937	52.0
1938	161
1939	89.0
1940	55.0
1941	62.0
1942	105
1943	220
1944	76.0
1945	67.0
1946	117
1947	84.0
1948	64.0
1949	76.0
1950	95.0
1951	140
1952	224
1953	100
1955	61.0
1956	151
1957	133
1958	149
1959	68.0
1960	65.0
1961	29.0
1962	82.0
1963	86.0
1964	85.0
1965	242
1966	98.0
1967	112
1968	64.0
1969	194
1970	109
1971	213
1972	150
1973	76.0
1974	166
1975	144
1976	109
1977	32.0
1978	98.0
1979	69.0
1980	94.0
1981	78.0
1982	182
1983	272
1984	186
1985	105
1986	197
1987	61.0
1988	29.0
1989	71.0
1990	37.0
1991	29.0
1992	16.0
1993	97.0
1994	36.0
1995	144
1996	145
1997	219
1998	157
1999	156
2000	82.0
2001	29.0
2002	41.0
2003	50.0
2004	30.0
2005	58.0
2006	187
2007	61.0
2008	58.0
2009	62.0
2010	58.0
2011	100
2012	131
2013	27.0
2014	42.0
2015	43.0
2016	65.0
2017	259
2018	105
2019	129
2020	58.0
2021	16.0
2022	38.0
2023	107
2024	80.0

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	1913–2024
Completeness	99.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1913–2024 holds no value: 1954. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1913 and is not continuous from it: 112 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

The snow standing above this water

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

560

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

170

Thinnest, in 2001 (mm of water)

March

Month the pack is usually at its fullest

May

Month the pack has gone by, in half of years

Peak snowpack at Hyndman

Water years 1981–2026. 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	Hyndman (mm)
1981	284
1982	521
1983	540
1984	293
1985	273
1986	452
1987	183
1988	213
1989	328
1990	202
1991	202
1992	210
1993	388
1994	188
1995	430
1996	341
1997	560
1998	273
1999	389
2000	307
2001	170
2002	279
2003	308
2004	273
2005	217
2006	487
2007	177
2008	296
2009	267
2010	193
2011	388
2012	239
2013	264
2014	257
2015	228
2016	294
2017	545
2018	227
2019	368
2020	175
2021	218
2022	211
2023	425
2024	261
2025	290
2026	249

Read against the river

Hyndman and MALAD RIVER NR GOODING ID both sit in this drainage area, and their records overlap by 44 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 Big Wood and what each holds
Gauge	Measures	Values	Record
BIG WOOD RIVER BL MAGIC DAM NR RICHFIELD ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	350	1912–2026
BIG WOOD RIVER AT HAILEY ID TOTAL FLOW	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	327	1915–2026
MALAD RIVER NR GOODING ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	306	1916–2026
BIG WOOD RIVER AT HAILEY ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	298	1915–2026
BIG WOOD RIVER NR BELLEVUE, ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	223	1912–2026
BIG WOOD SLOUGH AT HAILEY ID	burned area within 50 km, annual maximum river flow, mean river flow, mean river flow, water year	195	1915–2019
TRAIL CREEK AT KETCHUM ID	catchment area, annual maximum river flow	15	2012–2026
WARM SPRINGS CREEK NEAR KETCHUM ID	catchment area, annual maximum river flow	14	1920–2026
MALAD RIVER NR BLISS ID	catchment area, annual maximum river flow	2	2008–2026

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 — 17040219. 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
BIG WOOD RIVER BL MAGIC DAM NR RICHFIELD 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
BIG WOOD RIVER AT HAILEY ID TOTAL FLOW	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
MALAD RIVER NR GOODING 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
BIG WOOD RIVER AT HAILEY 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
BIG WOOD RIVER NR BELLEVUE, 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
BIG WOOD SLOUGH AT HAILEY 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
TRAIL CREEK AT KETCHUM 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
WARM SPRINGS CREEK NEAR KETCHUM 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
MALAD RIVER NR BLISS 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 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	6	yes, 3 or more
Years spanned	115	yes, 20 or more
Values held	4,810	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-13142500.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), Big Wood gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-big-wood/

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 Big Wood 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 confidence2025-05-09

Source: USGS — National Water Information System, USGS site 13142500, 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.