The monitoring network within this area

Hydrionis holds 1,207 values from 6 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.

6

Gauges

1,207

Values held

1895–2026

Record spans

Gauges within the Glendo Reservoir huc8 subbasin

6 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 NORTH PLATTE RIVER AT ORIN, WY

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1895–2025.

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	NORTH PLATTE RIVER AT ORIN, WY (m³/s)
1895	416
1899	660
1958	156
1959	122
1960	74.8
1961	127
1962	265
1964	139
1965	674
1966	234
1967	118
1968	169
1969	96.8
1970	637
1971	396
1972	118
1973	453
1974	225
1975	113
1976	116
1977	153
1978	345
1979	142
1981	86.9
1982	232
1983	264
1984	323
1985	116
1986	294
1987	87.8
1988	90.0
1989	119
1990	100.0
1991	430
1992	142
1993	137
1994	104
1995	254
1996	136
1997	193
1998	122
1999	187
2000	201
2001	97.1
2002	73.3
2003	103
2004	73.9
2005	97.1
2006	88.6
2007	136
2008	368
2009	154
2010	265
2011	278
2012	112
2013	88.3
2014	116
2015	130
2016	306
2017	136
2018	115
2019	170
2020	132
2021	101
2022	84.4
2023	191
2024	99.4
2025	113

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	1895–2025
Completeness	51.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	4 separate periods inside 1895–2025 hold no value. The longest runs from 1900 to 1957 — 58 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1895 and is not continuous from it: 131 years separate the first value from the last, and 52% 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 NORTH PLATTE RIVER BELOW GUERNSEY RESERVOIR, WY, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1903–1997.

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	NORTH PLATTE RIVER BELOW GUERNSEY RESERVOIR, WY (mm)
1903	46.0
1904	46.0
1905	51.0
1906	55.0
1907	75.0
1908	47.0
1909	79.0
1910	30.0
1911	37.0
1912	69.0
1913	33.0
1914	49.0
1915	36.0
1916	41.0
1917	80.0
1918	60.0
1919	38.0
1920	57.0
1921	59.0
1922	46.0
1923	45.0
1924	73.0
1925	45.0
1926	52.0
1927	49.0
1928	62.0
1929	65.0
1930	44.0
1931	38.0
1932	45.0
1933	46.0
1934	17.0
1935	26.0
1936	33.0
1937	39.0
1938	37.0
1939	34.0
1940	20.0
1941	31.0
1942	36.0
1943	35.0
1944	34.0
1945	33.0
1946	34.0
1947	31.0
1948	36.0
1949	33.0
1950	36.0
1951	32.0
1952	46.0
1953	31.0
1954	22.0
1955	19.0
1956	27.0
1957	27.0
1958	32.0
1959	29.0
1960	28.0
1961	21.0
1962	30.0
1963	33.0
1964	33.0
1965	32.0
1966	35.0
1967	28.0
1968	35.0
1969	36.0
1970	35.0
1971	52.0
1972	41.0
1973	63.0
1974	55.0
1975	37.0
1976	35.0
1977	31.0
1978	34.0
1979	33.0
1980	41.0
1981	29.0
1982	28.0
1983	63.0
1984	71.0
1985	43.0
1986	53.0
1987	30.0
1988	34.0
1989	29.0
1990	23.0
1991	28.0
1992	23.0
1993	28.0
1994	33.0
1995	32.0
1996	39.0
1997	47.0

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	1903–1997
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1903 to 1997 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

1 automated snow station sits inside this drainage area, weighing the snowpack rather than measuring how deep it is.

377

Fullest snowpack recorded at Windy Peak, in 1983 (mm of water)

44

Thinnest, in 2026 (mm of water)

March

Month the pack is usually at its fullest

June

Month the pack has gone by, in half of years

Peak snowpack at Windy Peak

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	Windy Peak (mm)
1983	377
1984	312
1985	130
1986	244
1987	131
1988	253
1989	92.0
1990	187
1991	153
1992	239
1993	265
1994	163
1995	110
1996	182
1997	246
1998	180
1999	187
2000	183
2001	182
2002	123
2003	227
2004	114
2005	143
2006	178
2007	166
2008	228
2009	237
2010	237
2011	273
2012	163
2013	122
2014	213
2015	140
2016	216
2017	226
2018	142
2019	240
2020	233
2021	293
2022	186
2023	287
2024	191
2025	154
2026	44.0

Read against the river

Windy Peak and NORTH PLATTE RIVER AT ORIN, WY 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 Glendo Reservoir and what each holds
Gauge	Measures	Values	Record
NORTH PLATTE RIVER BELOW GUERNSEY RESERVOIR, WY	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	290	1902–2026
NORTH PLATTE RIVER AT ORIN, WY	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	229	1895–2026
HORSESHOE CREEK NEAR GLENDO, WYO.	catchment area, annual maximum river flow	51	1928–2026
LA BONTE CREEK NEAR LA BONTE, WY	catchment area, annual maximum river flow	47	1917–2026
WAGONHOUND CREEK NEAR LA BONTE, WY	catchment area, annual maximum river flow	38	1929–2026
COTTONWOOD CREEK AT WENDOVER, WY	catchment area, annual maximum river flow	25	1929–2026

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 — 10180008. 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
NORTH PLATTE RIVER BELOW GUERNSEY RESERVOIR, WY	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
NORTH PLATTE RIVER AT ORIN, WY	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
HORSESHOE CREEK NEAR GLENDO, WYO.	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
LA BONTE CREEK NEAR LA BONTE, WY	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
WAGONHOUND CREEK NEAR LA BONTE, WY	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
COTTONWOOD CREEK AT WENDOVER, WY	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	132	yes, 20 or more
Values held	1,207	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-06656000.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), Glendo Reservoir gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-glendo-reservoir/

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 Glendo Reservoir 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 confidence1998-07-01

Source: USGS — National Water Information System, USGS site 06656000, 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.