The monitoring network within this area

Hydrionis holds 608 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

608

Values held

1904–2026

Record spans

Gauges within the Upper Trinity 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 Trinity Rv at Dallas, TX

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1904–2025.

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	Trinity Rv at Dallas, TX (m³/s)
1904	216
1905	640
1906	606
1907	289
1908	5,210
1910	164
1911	244
1912	246
1913	150
1915	1,121
1916	1,549
1917	244
1918	275
1920	1,529
1921	515
1922	2,127
1923	1,073
1925	501
1926	326
1927	396
1928	317
1930	968
1932	1,246
1933	496
1934	283
1935	2,172
1936	733
1938	1,911
1939	306
1940	513
1941	2,180
1942	3,143
1943	603
1944	643
1945	1,498
1946	1,102
1948	1,311
1949	2,336
1950	816
1951	265
1952	214
1953	470
1954	131
1955	170
1956	207
1957	2,132
1958	657
1959	215
1961	345
1962	374
1963	374
1964	923
1965	762
1966	1,192
1967	221
1968	708
1969	1,897
1970	566
1971	160
1973	932
1974	428
1975	765
1976	634
1977	1,042
1978	129
1979	844
1980	240
1981	413
1983	255
1984	368
1985	351
1986	555
1987	351
1988	245
1989	1,662
1990	2,330
1991	331
1993	668
1995	864
1996	169
1997	782
1998	796
2000	374
2001	883
2002	917
2004	818
2006	1,240
2007	1,096
2008	782
2009	881
2010	1,252
2011	357
2012	779
2013	345
2015	1,339
2017	462
2018	1,164
2020	725
2021	614
2022	900
2023	493
2025	759

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	1904–2025
Completeness	83.6% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	20 separate periods inside 1904–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1904 and is not continuous from it: 122 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	2026-10-01
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 Trinity Rv at Dallas, 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. 1914–2025.

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	Trinity Rv at Dallas, TX (mm)
1914	79.0
1915	135
1916	106
1917	13.0
1918	47.0
1919	128
1920	196
1921	68.0
1922	106
1923	96.0
1924	48.0
1925	26.0
1926	84.0
1927	94.0
1928	56.0
1929	79.0
1930	74.0
1931	49.0
1932	157
1933	78.0
1934	23.0
1935	123
1936	57.0
1937	41.0
1938	119
1939	15.0
1940	87.0
1941	218
1942	255
1943	54.0
1944	78.0
1945	225
1946	161
1947	64.0
1948	70.0
1949	104
1950	158
1951	27.0
1952	14.0
1953	18.0
1954	9.00
1955	8.00
1956	7.00
1957	241
1958	125
1959	42.0
1960	41.0
1961	37.0
1962	86.0
1963	25.0
1964	69.0
1965	83.0
1966	129
1967	30.0
1968	109
1969	132
1970	112
1971	70.0
1972	41.0
1973	142
1974	117
1975	135
1976	38.0
1977	92.0
1978	20.0
1979	74.0
1980	29.0
1981	192
1982	267
1983	45.0
1984	49.0
1985	87.0
1986	112
1987	125
1988	31.0
1989	223
1990	305
1991	173
1992	251
1993	195
1994	178
1995	157
1996	65.0
1997	228
1998	138
1999	52.0
2000	61.0
2001	130
2002	126
2003	62.0
2004	189
2005	64.0
2006	60.0
2007	218
2008	95.0
2009	135
2010	160
2011	48.0
2012	83.0
2013	46.0
2014	35.0
2015	386
2016	303
2017	87.0
2018	222
2019	237
2020	234
2021	155
2022	77.0
2023	93.0
2024	190
2025	139

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	1914–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1914 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 Upper Trinity and what each holds
Gauge	Measures	Values	Record
Trinity Rv at Dallas, TX	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	347	1904–2026
Trinity Rv nr Rosser, TX	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	261	1924–2026

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 — 12030105. 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
Trinity Rv at Dallas, 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
Trinity Rv nr Rosser, 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	123	yes, 20 or more
Values held	608	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-08057000.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 Trinity gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-trinity/

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 Trinity 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 confidence2025-01-30

Source: USGS — National Water Information System, USGS site 08057000, 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.