The monitoring network within this area

Hydrionis holds 374 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

374

Values held

1904–2026

Record spans

Gauges within the Upper Pecos-Black 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 PECOS RIVER NEAR MALAGA, NM

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1921–2025.

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	PECOS RIVER NEAR MALAGA, NM (m³/s)
1921	623
1922	50.7
1923	131
1925	467
1926	178
1928	283
1929	76.5
1932	504
1933	85.0
1934	56.9
1935	255
1936	53.0
1937	1,082
1938	251
1939	17.5
1940	90.9
1941	1,804
1942	154
1944	16.8
1945	121
1946	54.7
1948	535
1949	147
1950	225
1952	5.95
1953	10.7
1954	139
1955	245
1957	164
1958	119
1959	136
1960	254
1962	35.1
1963	93.4
1964	22.1
1965	365
1966	3,398
1967	112
1968	127
1969	86.9
1971	20.5
1972	118
1973	47.6
1974	561
1976	4.47
1977	2.38
1978	719
1980	748
1981	22.9
1982	14.2
1983	4.50
1984	631
1985	129
1986	1,390
1987	30.6
1988	19.1
1990	27.2
1991	30.0
1992	36.8
1993	25.6
1994	16.0
1996	105
1997	23.0
1999	126
2000	31.7
2002	36.2
2004	1,283
2005	17.4
2006	27.1
2007	27.0
2009	49.8
2010	7.22
2012	3.68
2013	374
2014	728
2015	24.0
2016	36.2
2017	6.17
2018	5.86
2020	9.06
2021	292
2022	24.5
2023	30.6
2025	41.9

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	1921–2025
Completeness	80.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	20 separate periods inside 1921–2025 hold no value. The longest runs from 1930 to 1931 — 2 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1921 and is not continuous from it: 105 years separate the first value from the last, and 80% 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 PECOS RIVER NEAR MALAGA, NM, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1938–2025.

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	PECOS RIVER NEAR MALAGA, NM (mm)
1938	3.00
1939	2.00
1940	2.00
1941	40.0
1942	11.0
1943	4.00
1944	3.00
1945	2.00
1946	2.00
1947	2.00
1948	2.00
1949	4.00
1950	4.00
1951	2.00
1952	1.00
1953	1.00
1954	5.00
1955	2.00
1956	1.00
1957	1.00
1958	3.00
1959	1.00
1960	2.00
1961	1.00
1962	1.00
1963	1.00
1964	0
1965	1.00
1966	7.00
1967	1.00
1968	1.00
1969	1.00
1970	1.00
1971	0
1972	1.00
1973	2.00
1974	4.00
1975	1.00
1976	0
1977	0
1978	1.00
1979	1.00
1980	1.00
1981	1.00
1982	1.00
1983	1.00
1984	2.00
1985	1.00
1986	6.00
1987	4.00
1988	1.00
1989	1.00
1990	1.00
1991	3.00
1992	3.00
1993	2.00
1994	2.00
1995	2.00
1996	2.00
1997	3.00
1998	2.00
1999	2.00
2000	1.00
2001	1.00
2002	1.00
2003	1.00
2004	3.00
2005	3.00
2006	2.00
2007	2.00
2008	1.00
2009	1.00
2010	2.00
2011	1.00
2012	0
2013	1.00
2014	2.00
2015	3.00
2016	2.00
2017	1.00
2018	1.00
2019	1.00
2020	1.00
2021	2.00
2022	1.00
2023	1.00
2024	1.00
2025	1.00

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	1938–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1938 to 2025 is held.
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 Pecos-Black and what each holds
Gauge	Measures	Values	Record
PECOS RIVER NEAR MALAGA, NM	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	229	1921–2026
PECOS RIVER AT CARLSBAD, NM	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	145	1904–2026

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 — 13060011. 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
PECOS RIVER NEAR MALAGA, NM	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
PECOS RIVER AT CARLSBAD, NM	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	123	yes, 20 or more
Values held	374	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-08406500.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 Pecos-Black gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-upper-pecos-black/

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 Pecos-Black 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 confidence2025-04-26

Source: USGS — National Water Information System, USGS site 08406500, 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.