The monitoring network within this area

Hydrionis holds 367 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

367

Values held

1896–2026

Record spans

Gauges within the Lower Skagit 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 SKAGIT RIVER NEAR CONCRETE, WA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1897–2024.

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	SKAGIT RIVER NEAR CONCRETE, WA (m³/s)
1897	7,504
1909	6,938
1917	5,947
1921	6,456
1924	2,619
1925	1,461
1926	2,517
1928	2,704
1930	912
1931	1,716
1932	4,163
1933	2,860
1935	3,710
1936	1,699
1937	1,934
1939	2,254
1940	1,444
1941	2,161
1942	1,529
1943	1,846
1945	2,005
1946	2,328
1947	2,696
1949	1,577
1951	3,936
1952	1,232
1953	1,869
1955	1,594
1956	1,727
1958	1,172
1959	2,568
1961	2,237
1962	1,586
1963	2,090
1964	1,489
1966	1,042
1967	2,047
1969	1,402
1971	1,761
1972	2,602
1974	2,263
1975	3,455
1977	1,654
1978	1,303
1979	3,851
1980	4,219
1982	1,464
1984	3,087
1985	1,305
1986	2,645
1987	1,121
1988	2,098
1989	3,370
1990	4,219
1992	1,509
1993	1,113
1994	1,034
1995	4,531
1997	2,588
1998	1,739
1999	2,917
2000	875
2002	2,670
2003	1,855
2004	2,815
2006	1,594
2007	2,206
2008	1,897
2009	1,691
2010	2,319
2012	1,492
2013	1,339
2014	1,328
2015	2,713
2016	1,691
2017	3,002
2018	1,586
2020	2,234
2021	3,794
2022	1,444
2023	2,758
2024	1,186

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	1897–2024
Completeness	64.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	27 separate periods inside 1897–2024 hold no value. The longest runs from 1898 to 1908 — 11 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1897 and is not continuous from it: 128 years separate the first value from the last, and 64% 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 SKAGIT RIVER NEAR CONCRETE, WA, 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	SKAGIT RIVER NEAR CONCRETE, WA (mm)
1925	1,935
1926	1,348
1927	1,975
1928	1,757
1929	1,250
1930	1,426
1931	1,683
1932	2,275
1933	2,450
1934	2,230
1935	1,722
1936	1,669
1937	1,830
1938	1,683
1939	1,941
1940	1,534
1941	1,463
1942	1,364
1943	1,776
1944	1,283
1945	1,747
1946	1,974
1947	1,943
1948	1,870
1949	2,121
1950	2,546
1951	2,072
1952	1,398
1953	2,082
1954	2,430
1955	2,129
1956	2,237
1957	1,684
1958	1,937
1959	2,482
1960	1,911
1961	2,111
1962	1,869
1963	1,838
1964	2,227
1965	1,828
1966	1,848
1967	2,270
1968	2,237
1969	1,796
1970	1,522
1971	2,274
1972	2,616
1973	1,539
1974	2,443
1975	2,275
1976	2,135
1977	1,605
1978	1,639
1979	1,567
1980	1,907
1981	1,794
1982	2,024
1983	1,869
1984	1,866
1985	1,678
1986	1,771
1987	1,539
1988	1,854
1989	1,890
1990	2,421
1991	2,155
1992	1,530
1993	1,406
1994	1,602
1995	2,291
1996	1,926
1997	2,542
1998	1,615
1999	2,341
2000	1,713
2001	1,384
2002	2,011
2003	1,882
2004	1,868
2005	1,502
2006	1,905
2007	2,116
2008	1,787
2009	1,770
2010	1,716
2011	2,051
2012	2,255
2013	1,912
2014	2,303
2015	1,852
2016	2,104
2017	2,021
2018	1,953
2019	1,445
2020	2,039
2021	2,210
2022	1,849
2023	1,382
2024	1,513
2025	1,750

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 Lower Skagit and what each holds
Gauge	Measures	Values	Record
SKAGIT RIVER NEAR CONCRETE, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	344	1897–2026
SKAGIT RIVER NEAR SEDRO WOOLLEY, WA	catchment area, annual maximum river flow	23	1896–2026

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 — 17110007. 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
SKAGIT RIVER NEAR CONCRETE, WA	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
SKAGIT RIVER NEAR SEDRO WOOLLEY, WA	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	1	no
Years spanned	131	yes, 20 or more
Values held	367	no
Distinct measurements	5	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-12194000.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 Skagit gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-skagit/

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 Skagit 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 confidence2024-12-18

Source: USGS — National Water Information System, USGS site 12194000, 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.