The monitoring network within this area

Hydrionis holds 477 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

477

Values held

1914–2026

Record spans

Gauges within the Upper Gila-San Carlos Reservoir 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 GILA RIVER AT HEAD OF SAFFORD VALLEY, NR SOLOMON,

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1914–2024.

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	GILA RIVER AT HEAD OF SAFFORD VALLEY, NR SOLOMON, (m³/s)
1914	255
1916	2,832
1918	76.5
1919	425
1921	445
1922	107
1923	357
1925	450
1926	160
1927	264
1928	91.5
1929	360
1930	286
1931	297
1932	680
1933	272
1934	651
1935	157
1936	227
1937	671
1938	133
1939	209
1940	279
1941	903
1943	189
1944	447
1945	136
1947	262
1948	71.9
1949	714
1950	35.1
1951	120
1952	558
1953	86.1
1954	279
1955	331
1957	169
1958	257
1959	223
1960	473
1961	136
1962	456
1964	280
1965	136
1967	985
1969	69.7
1970	63.7
1971	289
1972	2,333
1974	92.9
1975	991
1976	96.3
1977	71.9
1978	612
1980	716
1981	198
1983	320
1984	1,705
1985	218
1986	85.5
1988	221
1990	63.4
1991	742
1992	507
1993	2,441
1994	49.8
1995	1,767
1996	212
1997	479
1998	140
1999	233
2000	14.3
2002	134
2003	71.4
2005	1,104
2006	166
2007	94.0
2008	470
2009	21.1
2010	306
2011	32.0
2012	81.8
2013	776
2014	244
2015	286
2016	103
2017	191
2018	122
2019	191
2021	118
2022	580
2023	314
2024	34.8

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	1914–2024
Completeness	83.8% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	18 separate periods inside 1914–2024 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1914 and is not continuous from it: 111 years separate the first value from the last, and 84% 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 GILA RIVER AT HEAD OF SAFFORD VALLEY, NR SOLOMON,, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1921–2024.

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	GILA RIVER AT HEAD OF SAFFORD VALLEY, NR SOLOMON, (mm)
1921	18.0
1922	8.00
1923	26.0
1924	17.0
1925	15.0
1926	20.0
1927	17.0
1928	11.0
1929	15.0
1930	14.0
1931	23.0
1932	28.0
1936	13.0
1937	25.0
1938	10.0
1939	10.0
1940	18.0
1941	56.0
1942	13.0
1943	9.00
1944	9.00
1945	13.0
1946	7.00
1947	6.00
1948	9.00
1949	34.0
1950	5.00
1951	5.00
1952	20.0
1953	5.00
1954	12.0
1955	10.0
1956	3.00
1957	14.0
1958	28.0
1959	11.0
1960	17.0
1961	10.0
1962	25.0
1963	17.0
1964	9.00
1965	24.0
1966	26.0
1967	16.0
1968	40.0
1969	7.00
1970	7.00
1971	11.0
1972	31.0
1973	40.0
1974	7.00
1975	21.0
1976	9.00
1977	8.00
1978	49.0
1979	45.0
1980	27.0
1981	9.00
1982	17.0
1983	74.0
1984	27.0
1985	50.0
1986	22.0
1987	20.0
1988	27.0
1989	7.00
1990	10.0
1991	41.0
1992	48.0
1993	94.0
1994	23.0
1995	37.0
1996	12.0
1997	20.0
1998	21.0
1999	13.0
2000	20.0
2001	11.0
2002	6.00
2003	7.00
2004	11.0
2005	38.0
2006	22.0
2007	15.0
2008	21.0
2009	6.00
2010	28.0
2011	6.00
2012	6.00
2013	20.0
2014	11.0
2015	16.0
2016	12.0
2017	22.0
2018	6.00
2019	16.0
2020	16.0
2021	8.00
2022	27.0
2023	24.0
2024	9.00

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	1921–2024
Completeness	97.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1921–2024 holds no value: 1933 to 1935, 3 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1921 and is not continuous from it: 104 years separate the first value from the last, and 97% 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 Upper Gila-San Carlos Reservoir and what each holds
Gauge	Measures	Values	Record
GILA RIVER AT HEAD OF SAFFORD VALLEY, NR SOLOMON,	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	249	1914–2026
GILA RIVER AT CALVA, AZ	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	228	1916–2026

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 — 15040005. 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
GILA RIVER AT HEAD OF SAFFORD VALLEY, NR SOLOMON,	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
GILA RIVER AT CALVA, AZ	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	113	yes, 20 or more
Values held	477	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-09448500.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 Gila-San Carlos Reservoir gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-upper-gila-san-carlos-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 Upper Gila-San Carlos 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 confidence2024-04-03

Source: USGS — National Water Information System, USGS site 09448500, 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.