The monitoring network within this area

Hydrionis holds 376 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

376

Values held

1895–2026

Record spans

Gauges within the Lower Green 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 GREEN RIVER AT GREEN RIVER, UT

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	GREEN RIVER AT GREEN RIVER, UT (m³/s)
1895	745
1896	1,144
1897	1,784
1898	665
1899	1,365
1905	960
1907	1,362
1908	801
1909	1,761
1910	827
1911	782
1912	1,546
1913	756
1914	1,438
1915	547
1916	872
1917	1,928
1918	1,246
1919	572
1920	1,399
1921	1,855
1922	1,308
1923	1,189
1924	699
1925	606
1926	694
1927	1,311
1928	1,266
1929	1,198
1930	646
1931	371
1932	1,082
1933	784
1934	183
1935	889
1936	824
1937	779
1938	906
1939	595
1940	459
1941	796
1942	923
1943	847
1944	799
1945	674
1946	515
1947	934
1948	787
1949	940
1950	850
1951	866
1952	1,288
1953	807
1954	527
1955	408
1956	844
1957	1,215
1958	1,076
1959	484
1960	436
1961	379
1962	920
1963	268
1964	631
1965	850
1966	408
1967	640
1968	835
1969	595
1970	668
1971	637
1972	569
1973	864
1974	782
1975	810
1976	515
1977	246
1978	668
1979	827
1980	685
1981	348
1982	589
1983	1,269
1984	1,368
1985	767
1986	1,017
1987	388
1988	493
1989	232
1990	328
1991	357
1992	311
1993	719
1994	334
1995	844
1997	909
1998	691
1999	770
2000	527
2001	541
2002	217
2003	631
2004	337
2005	994
2006	603
2007	405
2008	748
2009	617
2010	691
2011	1,246
2012	311
2013	331
2014	589
2015	459
2016	691
2017	626
2018	368
2019	816
2020	580
2021	272
2022	490
2023	799
2024	564
2025	300

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	94.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	3 separate periods inside 1895–2025 hold no value. The longest runs from 1900 to 1904 — 5 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 95% of the years between them are held. The span is not the record.
Last read from the publisher	2026-08-31
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 GREEN RIVER AT GREEN RIVER, UT, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1895–2025.

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	GREEN RIVER AT GREEN RIVER, UT (mm)
1895	46.0
1896	43.0
1897	64.0
1898	38.0
1906	68.0
1907	94.0
1908	45.0
1909	92.0
1910	49.0
1911	45.0
1912	66.0
1913	57.0
1914	75.0
1915	39.0
1916	62.0
1917	89.0
1918	54.0
1919	32.0
1920	65.0
1921	76.0
1922	66.0
1923	69.0
1924	38.0
1925	47.0
1926	43.0
1927	60.0
1928	59.0
1929	69.0
1930	48.0
1931	23.0
1932	52.0
1933	37.0
1934	13.0
1935	31.0
1936	45.0
1937	44.0
1938	52.0
1939	34.0
1940	26.0
1941	49.0
1942	49.0
1943	46.0
1944	47.0
1945	45.0
1946	37.0
1947	59.0
1948	42.0
1949	54.0
1950	58.0
1951	50.0
1952	71.0
1953	35.0
1954	28.0
1955	30.0
1956	43.0
1957	62.0
1958	45.0
1959	31.0
1960	30.0
1961	24.0
1962	59.0
1963	17.0
1964	34.0
1965	55.0
1966	31.0
1967	45.0
1968	49.0
1969	53.0
1970	42.0
1971	46.0
1972	44.0
1973	55.0
1974	47.0
1975	52.0
1976	41.0
1977	26.0
1978	42.0
1979	46.0
1980	46.0
1981	27.0
1982	52.0
1983	85.0
1984	84.0
1985	59.0
1986	76.0
1987	37.0
1988	32.0
1989	22.0
1990	20.0
1991	27.0
1992	23.0
1993	40.0
1994	26.0
1995	51.0
1996	47.0
1997	69.0
1998	61.0
1999	55.0
2000	31.0
2001	25.0
2002	16.0
2003	26.0
2004	22.0
2005	46.0
2006	35.0
2007	26.0
2008	39.0
2009	39.0
2010	36.0
2011	80.0
2012	24.0
2013	21.0
2014	36.0
2015	36.0
2016	41.0
2017	56.0
2018	29.0
2019	46.0
2020	32.0
2021	17.0
2022	26.0
2023	48.0
2024	34.0
2025	21.0

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	1895–2025
Completeness	94.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1895–2025 holds no value: 1899 to 1905, 7 years with no reading. It is drawn as a break in the line and is 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 95% of the years between them are held. The span is not the record.
Last read from the publisher	2026-08-24
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 Green and what each holds
Gauge	Measures	Values	Record
GREEN RIVER AT GREEN RIVER, UT	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	285	1895–2026
COLORADO RIVER PLUS GREEN RIVER (TEMP)	burned area within 50 km, mean river flow	91	1928–2019

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 — 14060008. 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
GREEN RIVER AT GREEN RIVER, UT	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	2026-08-26
COLORADO RIVER PLUS GREEN RIVER (TEMP)	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	2026-08-26

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	2	no
Years spanned	132	yes, 20 or more
Values held	376	no
Distinct measurements	4	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-09315000.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 Green gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-lower-green/

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 Green 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 confidence2025-05-19

Source: USGS — National Water Information System, USGS site 09315000, 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 31 August 2026.