The monitoring network within this area

Hydrionis holds 2,745 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

2,745

Values held

1903–2026

Record spans

Gauges within the Upper Grande Ronde 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 GRANDE RONDE R AT LA GRANDE, OREG.

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1904–1988.

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 (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	GRANDE RONDE R AT LA GRANDE, OREG. (m³/s)
1904	178
1905	125
1906	140
1907	83.8
1908	178
1909	32.0
1911	38.8
1912	113
1913	114
1914	62.6
1915	36.8
1918	71.9
1919	97.4
1920	97.7
1921	123
1922	135
1923	66.0
1926	51.8
1927	69.7
1928	123
1929	84.1
1930	45.0
1931	241
1932	251
1933	73.6
1935	89.2
1936	124
1937	91.2
1938	68.2
1939	127
1940	58.3
1941	71.9
1942	81.3
1943	106
1944	72.8
1945	54.4
1946	151
1948	131
1949	88.9
1950	77.9
1951	85.8
1952	146
1953	99.7
1954	62.9
1955	78.2
1956	180
1957	137
1958	127
1960	112
1961	49.0
1962	56.6
1963	60.9
1964	81.6
1965	399
1966	45.9
1967	65.1
1968	87.8
1969	78.2
1970	111
1971	84.7
1972	179
1973	19.1
1974	119
1975	121
1976	148
1977	58.3
1978	94.6
1979	95.1
1980	51.0
1981	96.6
1982	161
1983	125
1984	127
1985	122
1986	222
1987	86.1
1988	51.3

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	1904–1988
Completeness	90.6% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	6 separate periods inside 1904–1988 hold no value. The longest runs from 1916 to 1917 — 2 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1904 and is not continuous from it: 85 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 GRANDE RONDE R AT LA GRANDE, OREG., as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1904–1988.

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	GRANDE RONDE R AT LA GRANDE, OREG. (mm)
1904	287
1905	111
1906	172
1907	222
1908	168
1909	134
1910	317
1911	108
1913	296
1914	184
1919	202
1920	244
1921	369
1922	275
1926	129
1927	244
1928	230
1929	156
1930	111
1931	119
1932	254
1933	198
1934	89.0
1935	110
1936	158
1937	150
1938	145
1939	139
1940	120
1941	182
1942	237
1943	260
1944	90.0
1945	162
1946	211
1947	176
1948	321
1949	199
1950	242
1951	196
1952	160
1953	250
1954	130
1955	166
1956	329
1957	223
1958	288
1959	174
1960	187
1961	143
1962	157
1963	135
1964	153
1965	278
1966	81.0
1967	172
1968	100
1969	221
1970	192
1971	226
1972	291
1973	103
1974	265
1975	266
1976	237
1977	104
1978	183
1979	227
1980	197
1981	192
1982	315
1983	263
1984	373
1985	198
1986	217
1987	133
1988	137

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	1904–1988
Completeness	90.6% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	3 separate periods inside 1904–1988 hold no value. The longest runs from 1915 to 1918 — 4 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1904 and is not continuous from it: 85 years separate the first value from the last, and 91% 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

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

842

Fullest snowpack recorded at Taylor Green, in 1984 (mm of water)

185

Thinnest, in 2026 (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 Taylor Green

Water years 1980–2026. 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	Taylor Green (mm)
1980	516
1981	432
1982	710
1983	823
1984	842
1985	581
1986	484
1987	375
1988	413
1989	725
1990	383
1991	405
1992	293
1993	621
1994	425
1995	536
1996	367
1997	636
1998	531
1999	635
2000	582
2001	274
2002	478
2003	366
2004	512
2005	243
2006	552
2007	334
2008	634
2009	448
2010	459
2011	678
2012	486
2013	374
2014	422
2015	282
2016	502
2017	431
2018	414
2019	707
2020	659
2021	697
2022	301
2023	667
2024	415
2025	724
2026	185

Why the snow is not read against the river here

Peak snow water equivalent and Mean river flow, water year overlap for only 8 years at these subjects. A relationship read off a span that short is reading the weather of a few seasons.

Every gauge Hydrionis holds within this area

Gauges within the Upper Grande Ronde and what each holds
Gauge	Measures	Values	Record
GRANDE RONDE R AT LA GRANDE, OREG.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	271	1903–2026
CATHERINE CREEK NEAR UNION, OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	254	1911–2026

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 — 17060104. 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
GRANDE RONDE R AT LA GRANDE, 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
CATHERINE CREEK NEAR UNION, 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

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	124	yes, 20 or more
Values held	2,745	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-13319000.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 Grande Ronde gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-grande-ronde/

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 Grande Ronde 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 confidence1988-04-03

Source: USGS — National Water Information System, USGS site 13319000, 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.