The monitoring network within this area

Hydrionis holds 354 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

354

Values held

1890–2026

Record spans

Gauges within the Lower Owyhee 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 OWYHEE RIVER BELOW OWYHEE DAM, OR

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1929–2025.

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	OWYHEE RIVER BELOW OWYHEE DAM, OR (m³/s)
1929	343
1930	57.2
1931	79.3
1932	413
1933	41.9
1934	8.24
1935	8.86
1936	343
1937	399
1938	243
1939	186
1940	44.2
1941	118
1942	292
1943	198
1944	5.95
1945	216
1946	208
1947	6.29
1948	3.99
1949	5.64
1950	5.15
1951	203
1952	648
1953	6.17
1954	10.6
1955	8.78
1956	6.68
1957	211
1958	215
1959	6.06
1960	7.70
1962	3.91
1963	4.36
1964	26.9
1965	275
1966	5.55
1967	5.66
1968	4.08
1969	306
1970	51.3
1971	422
1972	416
1973	89.8
1974	214
1975	180
1976	189
1977	7.14
1978	186
1979	128
1980	84.1
1981	5.97
1982	261
1983	362
1984	561
1985	165
1986	592
1987	5.86
1989	221
1990	7.73
1991	6.63
1992	5.04
1993	147
1994	7.76
1995	331
1996	186
1997	280
1998	306
1999	101
2000	7.93
2007	7.36
2008	6.57
2009	6.34
2010	6.34
2011	311
2012	8.04
2013	6.20
2014	4.87
2015	5.07
2016	6.06
2017	149
2019	145
2020	7.33
2021	5.35
2022	5.75
2023	5.97
2024	223
2025	123

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	1929–2025
Completeness	90.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	4 separate periods inside 1929–2025 hold no value. The longest runs from 2001 to 2006 — 6 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1929 and is not continuous from it: 97 years separate the first value from the last, and 91% 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 OWYHEE RIVER BELOW OWYHEE DAM, OR, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1930–2025.

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	OWYHEE RIVER BELOW OWYHEE DAM, OR (mm)
1930	10.0
1931	6.00
1932	36.0
1933	13.0
1934	3.00
1935	3.00
1936	21.0
1937	12.0
1938	28.0
1939	10.0
1940	3.00
1941	6.00
1942	20.0
1943	29.0
1944	2.00
1945	15.0
1946	18.0
1947	2.00
1948	1.00
1949	1.00
1950	2.00
1951	16.0
1952	50.0
1953	2.00
1954	1.00
1955	1.00
1956	2.00
1957	21.0
1958	21.0
1959	1.00
1960	1.00
1961	1.00
1962	1.00
1963	1.00
1964	2.00
1965	22.0
1966	2.00
1967	2.00
1968	1.00
1969	15.0
1970	5.00
1971	33.0
1972	35.0
1973	5.00
1974	19.0
1975	25.0
1976	18.0
1977	1.00
1978	7.00
1979	12.0
1980	8.00
1981	2.00
1982	26.0
1983	50.0
1984	93.0
1985	16.0
1986	45.0
1987	5.00
1988	3.00
1989	11.0
1990	4.00
1991	3.00
1992	2.00
1993	14.0
1994	4.00
1995	5.00
1996	21.0
1997	24.0
1998	19.0
1999	12.0
2000	5.00
2001	3.00
2002	3.00
2003	2.00
2004	3.00
2005	3.00
2006	40.0
2007	5.00
2008	4.00
2009	4.00
2010	4.00
2011	34.0
2012	4.00
2013	3.00
2014	2.00
2015	2.00
2016	3.00
2017	18.0
2018	3.00
2019	7.00
2020	4.00
2021	2.00
2022	3.00
2024	18.0
2025	12.0

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	1930–2025
Completeness	99.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1930–2025 holds no value: 2023. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1930 and is not continuous from it: 96 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

Every gauge Hydrionis holds within this area

Gauges within the Lower Owyhee and what each holds
Gauge	Measures	Values	Record
OWYHEE RIVER BELOW OWYHEE DAM, OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	319	1929–2026
OWYHEE RIVER AT OWYHEE, OREG.	catchment area, annual maximum river flow	35	1890–2026

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 — 17050110. 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
OWYHEE RIVER BELOW OWYHEE DAM, OR	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
OWYHEE RIVER AT OWYHEE, OREG.	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 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	1	no
Years spanned	137	yes, 20 or more
Values held	354	no
Distinct measurements	5	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-13183000.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), Lower Owyhee gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-owyhee/

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 Lower Owyhee 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 confidence2025-03-14

Source: USGS — National Water Information System, USGS site 13183000, 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.