The monitoring network within this area

Hydrionis holds 3,867 values from 10 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.

10

Gauges

3,867

Values held

1899–2026

Record spans

Gauges within the Alamosa-Trinchera huc8 subbasin

10 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 RIO GRANDE NEAR LOBATOS, CO

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1900–2024.

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	RIO GRANDE NEAR LOBATOS, CO (m³/s)
1900	133
1901	103
1902	16.0
1903	362
1904	21.3
1905	374
1906	237
1907	249
1908	65.1
1909	216
1910	152
1911	167
1912	248
1913	62.3
1914	130
1915	115
1916	170
1917	222
1918	47.3
1919	144
1920	264
1921	357
1922	207
1923	117
1924	217
1925	33.4
1926	94.3
1927	278
1929	101
1930	45.0
1932	164
1933	64.8
1934	18.8
1935	130
1936	71.9
1937	124
1938	114
1939	46.4
1940	33.7
1941	229
1942	158
1943	39.6
1944	182
1945	81.6
1947	55.5
1948	244
1949	264
1950	193
1952	328
1953	28.2
1956	19.3
1957	108
1958	121
1959	11.8
1960	57.8
1961	40.8
1962	74.2
1963	12.0
1965	107
1966	37.7
1967	31.4
1968	69.9
1969	77.3
1970	54.7
1971	48.7
1972	24.2
1973	101
1974	22.2
1975	70.5
1976	41.1
1978	27.7
1979	137
1980	91.5
1982	55.2
1983	91.5
1984	96.0
1985	177
1986	175
1987	191
1988	24.0
1989	53.0
1990	52.7
1991	60.3
1992	48.1
1993	110
1994	65.7
1995	179
1996	18.4
1997	102
1999	65.4
2001	61.4
2002	12.5
2003	8.55
2004	40.2
2005	116
2007	44.2
2008	83.3
2009	70.8
2010	46.4
2011	28.0
2012	37.1
2013	17.4
2014	30.9
2015	39.4
2016	44.7
2017	70.2
2018	17.4
2019	98.5
2020	16.1
2021	27.0
2022	30.6
2023	104
2024	22.1

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	1900–2024
Completeness	90.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	11 separate periods inside 1900–2024 hold no value. The longest runs from 1954 to 1955 — 2 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1900 and is not continuous from it: 125 years separate the first value from the last, and 90% 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 RIO GRANDE NEAR LOBATOS, CO, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1900–2023.

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	RIO GRANDE NEAR LOBATOS, CO (mm)
1900	30.0
1901	28.0
1902	10.0
1903	63.0
1904	19.0
1905	99.0
1906	85.0
1907	144
1908	36.0
1909	93.0
1910	56.0
1911	104
1912	85.0
1913	29.0
1914	59.0
1915	47.0
1916	77.0
1917	80.0
1918	26.0
1919	61.0
1920	104
1921	86.0
1922	67.0
1923	69.0
1924	75.0
1925	32.0
1926	43.0
1927	72.0
1928	32.0
1929	60.0
1930	27.0
1931	13.0
1932	60.0
1933	24.0
1934	10.0
1935	36.0
1936	28.0
1937	47.0
1938	57.0
1939	21.0
1940	11.0
1941	95.0
1942	68.0
1943	18.0
1944	61.0
1945	28.0
1946	12.0
1947	23.0
1948	66.0
1949	57.0
1950	13.0
1951	7.00
1952	47.0
1953	12.0
1954	6.00
1955	6.00
1956	7.00
1957	45.0
1958	36.0
1959	9.00
1960	20.0
1961	17.0
1962	32.0
1963	7.00
1964	6.00
1965	50.0
1966	26.0
1967	16.0
1968	33.0
1969	42.0
1970	32.0
1971	21.0
1972	16.0
1973	52.0
1974	12.0
1975	47.0
1976	25.0
1977	6.00
1978	17.0
1979	63.0
1980	45.0
1981	13.0
1982	44.0
1983	39.0
1984	42.0
1985	88.0
1986	80.0
1987	83.0
1988	18.0
1989	22.0
1990	18.0
1991	31.0
1992	24.0
1993	40.0
1994	29.0
1995	53.0
1996	13.0
1997	56.0
1998	24.0
1999	46.0
2000	11.0
2001	29.0
2002	7.00
2003	7.00
2004	22.0
2005	45.0
2006	23.0
2007	29.0
2008	39.0
2009	29.0
2010	23.0
2011	20.0
2012	13.0
2013	13.0
2014	23.0
2015	25.0
2016	28.0
2017	41.0
2018	9.00
2019	56.0
2020	11.0
2021	16.0
2022	19.0
2023	40.0

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	1900–2023
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1900 to 2023 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

5 automated snow stations sit inside this drainage area, weighing the snowpack rather than measuring how deep it is.

530

Fullest snowpack recorded at Culebra #2, in 1983 (mm of water)

137

Thinnest, in 2026 (mm of water)

March

Month the pack is usually at its fullest

May

Month the pack has gone by, in half of years

Peak snowpack at Culebra #2

Water years 1980–2026. 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	Culebra #2 (mm)
1980	431
1981	169
1982	292
1983	530
1984	404
1985	412
1986	192
1987	319
1988	248
1989	361
1990	309
1991	349
1992	394
1993	503
1994	372
1995	422
1996	230
1997	294
1998	363
1999	176
2000	262
2001	311
2002	200
2003	318
2004	249
2005	490
2006	157
2007	324
2008	382
2009	334
2010	357
2011	205
2012	247
2013	256
2014	268
2015	321
2016	289
2017	433
2018	196
2019	397
2020	367
2021	418
2022	206
2023	306
2024	276
2025	222
2026	137

Why the snow is not read against the river here

Peak snow water equivalent and Mean river flow, water year overlap for only 1 year at these subjects. A relationship read off a span that short is reading the weather of a few seasons.

Every gauge Hydrionis holds within this area

Gauges within the Alamosa-Trinchera and what each holds
Gauge	Measures	Values	Record
RIO GRANDE NEAR LOBATOS, CO	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	404	1899–2026
RIO GRANDE AT ALAMOSA, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	250	1912–2026
UTE CREEK NEAR FORT GARLAND, CO	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	235	1916–2026
CULEBRA CREEK AT SAN LUIS, CO	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	226	1927–2026
RIO GRANDE NEAR MONTE VISTA, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	198	1926–2026
ALAMOSA RIVER ABOVE TERRACE RESERVOIR, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	196	1911–2026
TRINCHERA C AB TURNERS RANCH, NR FT GARLAND, CO.	catchment area, annual maximum river flow	60	1923–2026
SANGRE DE CRISTO CREEK NEAR FORT GARLAND, CO.	catchment area, annual maximum river flow	58	1923–2026
TRINCHERA CREEK BELOW SMITH RES, NR BLANCA, CO.	catchment area, annual maximum river flow	52	1929–2026
PINOS CREEK NEAR DEL NORTE, CO.	catchment area, annual maximum river flow	50	1920–2026

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 — 13010002. 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
RIO GRANDE NEAR LOBATOS, CO	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
RIO GRANDE AT ALAMOSA, CO.	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
UTE CREEK NEAR FORT GARLAND, CO	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
CULEBRA CREEK AT SAN LUIS, CO	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
RIO GRANDE NEAR MONTE VISTA, CO.	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
ALAMOSA RIVER ABOVE TERRACE RESERVOIR, CO.	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
TRINCHERA C AB TURNERS RANCH, NR FT GARLAND, CO.	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
SANGRE DE CRISTO CREEK NEAR FORT GARLAND, CO.	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
TRINCHERA CREEK BELOW SMITH RES, NR BLANCA, CO.	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
PINOS CREEK NEAR DEL NORTE, CO.	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	10	yes, 3 or more
Years spanned	128	yes, 20 or more
Values held	3,867	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-08251500.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), Alamosa-Trinchera gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-alamosa-trinchera/

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 Alamosa-Trinchera 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 confidence2024-05-12

Source: USGS — National Water Information System, USGS site 08251500, 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.