The monitoring network within this area

Hydrionis holds 865 values from 3 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

865

Values held

1920–2026

Record spans

Gauges within the Lower West Fork Trinity huc8 subbasin

3 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 W Fk Trinity Rv at Ft Worth, TX

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	W Fk Trinity Rv at Ft Worth, TX (m³/s)
1921	268
1922	2,407
1923	462
1925	227
1926	241
1927	130
1928	362
1929	306
1930	371
1932	515
1933	173
1934	102
1935	530
1936	323
1937	113
1938	374
1939	106
1940	241
1941	289
1942	671
1944	200
1945	883
1946	133
1948	411
1949	1,821
1950	208
1951	73.1
1952	80.1
1953	96.8
1955	38.5
1956	77.9
1957	759
1958	222
1959	160
1961	222
1962	272
1963	77.0
1964	306
1965	194
1966	365
1967	54.9
1968	266
1969	264
1970	179
1971	100.0
1973	208
1974	213
1976	142
1977	459
1978	52.7
1979	413
1981	294
1983	130
1985	256
1986	464
1987	273
1988	163
1989	753
1990	1,025
1991	273
1992	281
1994	210
1995	354
1996	93.4
1997	580
1998	606
1999	450
2000	544
2001	371
2002	467
2004	558
2006	292
2007	507
2008	348
2009	382
2011	108
2012	430
2013	128
2014	139
2015	439
2017	317
2018	354
2019	462
2020	493
2021	374
2022	501
2023	110
2025	331

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	83.8% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	17 separate periods inside 1921–2025 hold no value. 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 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 W Fk Trinity Rv at Ft Worth, 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. 1921–2025.

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	W Fk Trinity Rv at Ft Worth, TX (mm)
1921	41.0
1922	93.0
1923	93.0
1924	33.0
1925	16.0
1926	61.0
1927	55.0
1928	44.0
1929	44.0
1930	61.0
1931	41.0
1932	105
1933	60.0
1934	7.00
1935	55.0
1936	46.0
1937	17.0
1938	56.0
1939	8.00
1940	35.0
1941	202
1942	201
1943	31.0
1944	39.0
1945	135
1946	69.0
1947	37.0
1948	31.0
1949	68.0
1950	100
1951	18.0
1952	9.00
1953	5.00
1954	1.00
1955	3.00
1956	3.00
1957	156
1958	64.0
1959	30.0
1960	24.0
1961	9.00
1962	48.0
1963	9.00
1964	12.0
1965	32.0
1966	60.0
1967	4.00
1968	58.0
1969	58.0
1970	56.0
1971	19.0
1972	9.00
1973	34.0
1974	48.0
1975	70.0
1976	11.0
1977	47.0
1978	3.00
1979	39.0
1980	10.0
1981	101
1982	142
1983	7.00
1984	8.00
1985	15.0
1986	35.0
1987	75.0
1988	7.00
1989	203
1990	241
1991	123
1992	134
1993	71.0
1994	64.0
1995	67.0
1996	28.0
1997	147
1998	68.0
1999	10.0
2000	15.0
2001	59.0
2002	30.0
2003	12.0
2004	64.0
2005	9.00
2006	11.0
2007	84.0
2008	18.0
2009	24.0
2010	64.0
2011	8.00
2012	27.0
2013	8.00
2014	5.00
2015	203
2016	180
2017	18.0
2018	56.0
2019	110
2020	85.0
2021	42.0
2022	10.0
2023	14.0
2024	23.0
2025	53.0

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	1921–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1921 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 Lower West Fork Trinity and what each holds
Gauge	Measures	Values	Record
W Fk Trinity Rv at Ft Worth, TX	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	316	1920–2026
W Fk Trinity Rv at Grand Prairie, TX	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	302	1925–2026
Clear Fk Trinity Rv at Ft Worth, TX	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	247	1922–2026

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 — 12030102. 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
W Fk Trinity Rv at Ft Worth, 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
W Fk Trinity Rv at Grand Prairie, 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
Clear Fk Trinity Rv at Ft Worth, 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 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	3	yes, 3 or more
Years spanned	107	yes, 20 or more
Values held	865	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-08048000.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), Lower West Fork Trinity gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-west-fork-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 Lower West Fork 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 confidence2025-05-06

Source: USGS — National Water Information System, USGS site 08048000, 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.