The monitoring network within this area

Hydrionis holds 428 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

428

Values held

1869–2026

Record spans

Gauges within the Austin-Travis Lakes 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 Colorado Rv at Austin, TX

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1869–2025.

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	Colorado Rv at Austin, TX (m³/s)
1869	15,574
1899	3,200
1900	6,683
1913	4,644
1915	2,379
1916	1,303
1918	1,458
1919	1,424
1921	2,144
1922	3,398
1923	1,422
1925	906
1926	943
1927	1,303
1929	4,361
1930	1,056
1932	2,195
1933	1,252
1934	1,283
1935	13,620
1936	6,626
1938	7,815
1939	578
1940	1,294
1941	1,348
1942	164
1944	120
1945	521
1946	402
1948	115
1949	112
1950	122
1951	105
1952	105
1953	105
1954	118
1955	249
1957	1,155
1958	943
1959	161
1960	878
1962	212
1963	131
1964	292
1965	456
1966	286
1967	150
1968	487
1969	225
1970	433
1971	151
1972	235
1974	368
1976	331
1977	971
1978	195
1979	487
1980	146
1981	767
1982	637
1983	239
1984	328
1986	357
1987	1,085
1988	148
1989	323
1990	187
1991	388
1993	242
1994	258
1995	680
1996	209
1997	878
1998	360
2000	178
2001	442
2003	345
2004	753
2006	331
2007	813
2008	112
2009	203
2010	1,068
2011	213
2012	362
2013	122
2015	983
2017	194
2018	268
2020	225
2021	175
2023	115
2024	175
2025	459

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	1869–2025
Completeness	59.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	24 separate periods inside 1869–2025 hold no value. The longest runs from 1870 to 1898 — 29 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1869 and is not continuous from it: 157 years separate the first value from the last, and 60% 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 Colorado Rv at Austin, 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. 1899–2025.

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	Colorado Rv at Austin, TX (mm)
1899	29.0
1900	77.0
1901	16.0
1902	29.0
1903	26.0
1904	21.0
1905	24.0
1906	35.0
1907	22.0
1908	36.0
1909	21.0
1910	11.0
1911	24.0
1912	11.0
1913	59.0
1914	58.0
1915	35.0
1916	13.0
1917	6.00
1918	34.0
1919	89.0
1920	38.0
1921	15.0
1922	62.0
1923	43.0
1924	25.0
1925	26.0
1926	32.0
1927	26.0
1928	21.0
1929	24.0
1930	43.0
1931	23.0
1932	54.0
1933	12.0
1934	14.0
1935	90.0
1936	85.0
1937	18.0
1938	60.0
1939	20.0
1940	26.0
1941	64.0
1942	23.0
1943	24.0
1944	26.0
1945	30.0
1946	28.0
1947	22.0
1948	16.0
1949	17.0
1950	14.0
1951	12.0
1952	10.0
1953	12.0
1954	12.0
1955	20.0
1956	13.0
1957	78.0
1958	40.0
1959	36.0
1960	28.0
1961	35.0
1962	12.0
1963	12.0
1964	9.00
1965	22.0
1966	17.0
1967	13.0
1968	42.0
1969	21.0
1970	29.0
1971	19.0
1972	13.0
1973	21.0
1974	35.0
1975	37.0
1976	18.0
1977	33.0
1978	15.0
1979	15.0
1980	15.0
1981	32.0
1982	19.0
1983	11.0
1984	13.0
1985	13.0
1986	26.0
1987	49.0
1988	13.0
1989	11.0
1990	12.0
1991	27.0
1992	82.0
1993	16.0
1994	13.0
1995	15.0
1996	13.0
1997	52.0
1998	25.0
1999	11.0
2000	12.0
2001	23.0
2002	26.0
2003	16.0
2004	31.0
2005	22.0
2006	9.00
2007	37.0
2008	11.0
2009	11.0
2010	13.0
2011	11.0
2012	4.00
2013	5.00
2014	3.00
2015	4.00
2016	27.0
2018	27.0
2019	21.0
2020	6.00
2021	5.00
2022	7.00
2023	2.00
2024	2.00
2025	5.00

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	1899–2025
Completeness	99.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1899–2025 holds no value: 2017. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1899 and is not continuous from it: 127 years separate the first value from the last, and 99% of the years between them are held. The span is not the record.
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 Austin-Travis Lakes and what each holds
Gauge	Measures	Values	Record
Colorado Rv at Austin, TX	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	278	1869–2026
Onion Ck at US Hwy 183, Austin, TX	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	150	1869–2026

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 — 12090205. 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
Colorado Rv at Austin, 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	2026-08-26
Onion Ck at US Hwy 183, Austin, 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	2026-08-26

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	158	yes, 20 or more
Values held	428	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-08158000.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), Austin-Travis Lakes gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-austin-travis-lakes/

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 Austin-Travis Lakes 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 confidence2025-07-05

Source: USGS — National Water Information System, USGS site 08158000, 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.