The monitoring network within this area

Hydrionis holds 1,989 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

1,989

Values held

1896–2026

Record spans

Gauges within the Lower Gunnison 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 GUNNISON RIVER NEAR GRAND JUNCTION, CO.

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1897–2025.

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	GUNNISON RIVER NEAR GRAND JUNCTION, CO. (m³/s)
1897	586
1898	323
1899	445
1902	240
1903	504
1904	260
1905	776
1906	620
1917	708
1918	510
1919	323
1920	1,011
1921	852
1922	637
1923	521
1924	362
1925	261
1926	402
1927	515
1928	606
1929	654
1930	351
1931	111
1932	524
1933	538
1934	136
1935	464
1936	433
1937	445
1938	498
1939	234
1940	255
1941	779
1942	620
1943	388
1944	770
1945	447
1946	309
1947	394
1948	629
1949	547
1950	233
1951	282
1952	660
1953	399
1955	231
1956	246
1957	787
1958	578
1959	203
1960	269
1961	222
1962	481
1963	140
1964	385
1965	447
1966	165
1967	139
1968	221
1969	340
1970	326
1971	193
1972	148
1973	340
1974	230
1975	260
1976	152
1977	139
1978	242
1979	382
1980	399
1981	122
1982	240
1983	600
1984	742
1985	447
1986	300
1987	265
1988	105
1989	112
1990	81.3
1991	216
1992	188
1993	612
1994	178
1995	510
1996	227
1997	365
1998	300
1999	182
2001	146
2002	81.8
2003	170
2004	107
2005	348
2006	165
2008	442
2009	365
2010	227
2011	433
2012	76.5
2013	125
2014	374
2015	294
2016	297
2017	462
2019	487
2020	137
2021	71.4
2022	171
2023	507
2024	254
2025	156

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	1897–2025
Completeness	87.6% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	6 separate periods inside 1897–2025 hold no value. The longest runs from 1907 to 1916 — 10 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1897 and is not continuous from it: 129 years separate the first value from the last, and 88% 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 GUNNISON RIVER NEAR GRAND JUNCTION, CO., as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1897–2024.

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	GUNNISON RIVER NEAR GRAND JUNCTION, CO. (mm)
1897	164
1898	89.0
1902	62.0
1903	126
1904	78.0
1905	156
1917	171
1918	124
1919	100
1920	184
1921	166
1922	136
1923	151
1924	117
1925	107
1926	117
1927	152
1928	143
1929	192
1930	119
1931	48.0
1932	133
1933	88.0
1934	32.0
1935	88.0
1936	105
1937	91.0
1938	150
1939	81.0
1940	66.0
1941	150
1942	161
1943	107
1944	134
1945	109
1946	76.0
1947	116
1948	142
1949	127
1950	80.0
1951	68.0
1952	161
1953	79.0
1954	39.0
1955	61.0
1956	66.0
1957	203
1958	136
1959	59.0
1960	80.0
1961	66.0
1962	128
1963	54.0
1964	81.0
1965	161
1966	58.0
1967	64.0
1968	89.0
1969	116
1970	142
1971	125
1972	72.0
1973	125
1974	98.0
1975	115
1976	74.0
1977	36.0
1978	88.0
1979	144
1980	136
1981	57.0
1982	115
1983	188
1984	230
1985	191
1986	179
1987	136
1988	70.0
1989	56.0
1990	46.0
1991	96.0
1992	85.0
1993	172
1994	81.0
1995	208
1996	113
1997	179
1998	113
1999	106
2000	80.0
2001	69.0
2002	43.0
2003	52.0
2004	57.0
2005	113
2006	96.0
2007	92.0
2008	148
2009	113
2010	87.0
2011	137
2012	48.0
2013	52.0
2014	101
2015	97.0
2016	98.0
2017	125
2018	50.0
2019	130
2020	56.0
2021	49.0
2022	58.0
2023	123
2024	84.0

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	1897–2024
Completeness	89.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	2 separate periods inside 1897–2024 hold no value. The longest runs from 1906 to 1916 — 11 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1897 and is not continuous from it: 128 years separate the first value from the last, and 89% 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

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

1,228

Fullest snowpack recorded at Park Reservoir, in 2023 (mm of water)

308

Thinnest, in 2026 (mm of water)

April

Month the pack is usually at its fullest

June

Month the pack has gone by, in half of years

Peak snowpack at Park Reservoir

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	Park Reservoir (mm)
1980	910
1981	420
1982	1,016
1983	1,211
1984	862
1985	876
1986	982
1987	816
1988	652
1989	693
1990	540
1991	697
1992	592
1993	1,195
1994	623
1995	1,095
1996	633
1997	957
1998	853
1999	680
2000	544
2001	550
2002	365
2003	606
2004	648
2005	1,140
2006	644
2007	435
2008	867
2009	676
2010	654
2011	1,016
2012	465
2013	481
2014	632
2015	391
2016	668
2017	756
2018	318
2019	942
2020	517
2021	486
2022	713
2023	1,228
2024	493
2025	381
2026	308

Read against the river

Park Reservoir and SURFACE CREEK AT CEDAREDGE, CO. both sit in this drainage area, and their records overlap by 45 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 Lower Gunnison and what each holds
Gauge	Measures	Values	Record
GUNNISON RIVER NEAR GRAND JUNCTION, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	383	1896–2026
SURFACE CREEK AT CEDAREDGE, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	335	1917–2026
KANNAH CREEK NEAR WHITEWATER, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	216	1917–2026

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 — 14020005. 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
GUNNISON RIVER NEAR GRAND JUNCTION, CO.	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
SURFACE CREEK AT CEDAREDGE, CO.	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
KANNAH CREEK NEAR WHITEWATER, CO.	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	3	yes, 3 or more
Years spanned	131	yes, 20 or more
Values held	1,989	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-09152500.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 Gunnison gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-gunnison/

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 Gunnison 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 confidence2025-06-01

Source: USGS — National Water Information System, USGS site 09152500, 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.