The monitoring network within this area

Hydrionis holds 470 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

470

Values held

1916–2026

Record spans

Gauges within the North Concho 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 N Concho Rv nr Carlsbad, TX

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1925–2025.

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	N Concho Rv nr Carlsbad, TX (m³/s)
1925	1,702
1926	1,523
1927	152
1928	850
1929	201
1930	1,073
1932	479
1934	210
1935	770
1936	2,679
1937	1,263
1938	889
1939	47.0
1940	145
1941	1,286
1942	81.8
1943	39.1
1944	53.8
1945	1,036
1947	770
1948	1,402
1949	439
1950	153
1951	94.6
1952	29.7
1953	408
1954	119
1955	82.7
1956	144
1957	232
1959	197
1961	278
1963	54.4
1964	94.0
1965	69.9
1966	142
1967	43.6
1968	43.6
1969	73.6
1971	67.4
1972	90.3
1973	123
1974	566
1976	33.4
1977	62.3
1978	171
1979	6.88
1980	309
1981	41.9
1983	1.73
1985	5.83
1986	326
1988	108
1989	42.2
1990	8.61
1991	28.3
1992	62.3
1993	0.340
1994	49.3
1995	0.708
1996	203
1997	73.3
1998	46.4
1999	1.76
2000	303
2002	55.2
2004	0.193
2005	182
2006	2.07
2007	29.2
2008	2.18
2009	2.61
2010	0.481
2011	16.8
2012	52.4
2013	60.9
2015	467
2017	0.0011
2018	59.5
2020	0.023
2021	13.0
2023	10.1
2024	106
2025	127

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	1925–2025
Completeness	83.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	17 separate periods inside 1925–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1925 and is not continuous from it: 101 years separate the first value from the last, and 83% 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 N Concho Rv nr Carlsbad, TX, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1925–2025.

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	N Concho Rv nr Carlsbad, TX (mm)
1925	54.0
1926	13.0
1927	5.00
1928	11.0
1929	7.00
1930	11.0
1931	2.00
1932	24.0
1933	1.00
1934	6.00
1935	31.0
1936	99.0
1937	8.00
1938	11.0
1939	2.00
1940	4.00
1941	18.0
1942	3.00
1943	2.00
1944	2.00
1945	21.0
1946	1.00
1947	8.00
1948	32.0
1949	15.0
1950	6.00
1951	2.00
1952	0
1953	12.0
1954	8.00
1955	2.00
1956	5.00
1957	63.0
1958	2.00
1959	9.00
1960	1.00
1961	12.0
1962	0
1963	1.00
1964	4.00
1965	4.00
1966	3.00
1967	0
1968	1.00
1969	1.00
1970	0
1971	3.00
1972	1.00
1973	2.00
1974	21.0
1975	1.00
1976	1.00
1977	1.00
1978	4.00
1979	1.00
1980	11.0
1981	2.00
1982	2.00
1983	2.00
1984	0
1985	1.00
1986	20.0
1987	4.00
1988	3.00
1989	1.00
1990	1.00
1991	2.00
1992	6.00
1993	1.00
1994	1.00
1995	0
1996	4.00
1997	2.00
1998	1.00
1999	0
2000	7.00
2001	1.00
2002	1.00
2003	1.00
2004	3.00
2005	6.00
2006	0
2007	1.00
2008	0
2009	0
2010	1.00
2011	0
2012	1.00
2013	1.00
2014	0
2015	11.0
2016	0
2017	0
2018	4.00
2019	0
2020	0
2021	0
2022	0
2023	0
2024	2.00
2025	2.00

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	1925–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1925 to 2025 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

Every gauge Hydrionis holds within this area

Gauges within the North Concho and what each holds
Gauge	Measures	Values	Record
N Concho Rv nr Carlsbad, TX	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	304	1924–2026
N Concho Rv at San Angelo, TX	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	166	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 — 12090104. 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
N Concho Rv nr Carlsbad, TX	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
N Concho Rv at San Angelo, TX	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 2 of them, which makes it a profile, not indexed.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	111	yes, 20 or more
Values held	470	no
Distinct measurements	4	yes, 2 or more
Publishers measuring it	1	no
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-08134000.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), North Concho gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-north-concho/

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 North Concho 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 confidence2025-04-20

Source: USGS — National Water Information System, USGS site 08134000, 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.