The monitoring network within this area

Hydrionis holds 370 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

370

Values held

1928–2026

Record spans

Gauges within the Stillaguamish 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 NF STILLAGUAMISH RIVER NEAR ARLINGTON, WA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1928–2025.

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	NF STILLAGUAMISH RIVER NEAR ARLINGTON, WA (m³/s)
1928	405
1930	362
1931	626
1932	784
1933	597
1935	640
1936	306
1937	631
1939	436
1940	276
1941	402
1942	487
1943	544
1945	617
1947	779
1949	357
1951	866
1952	385
1953	665
1955	597
1956	759
1958	445
1959	833
1961	779
1962	566
1963	770
1964	640
1966	425
1967	580
1969	745
1970	566
1971	680
1972	804
1974	651
1975	750
1977	665
1979	484
1980	898
1982	929
1984	900
1986	875
1988	589
1989	909
1990	1,039
1991	606
1993	663
1995	915
1996	980
1997	974
1998	833
1999	779
2001	292
2002	949
2003	708
2004	1,104
2006	575
2007	524
2009	1,399
2010	1,560
2011	824
2013	521
2014	555
2015	1,433
2017	595
2018	680
2020	1,150
2021	852
2022	685
2023	917
2025	507

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	1928–2025
Completeness	71.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	28 separate periods inside 1928–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1928 and is not continuous from it: 98 years separate the first value from the last, and 71% 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 NF STILLAGUAMISH RIVER NEAR ARLINGTON, 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. 1929–2024.

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	NF STILLAGUAMISH RIVER NEAR ARLINGTON, WA (mm)
1929	1,378
1930	1,629
1931	2,433
1932	3,205
1933	3,097
1934	2,398
1935	1,929
1936	2,036
1937	2,410
1938	2,008
1939	2,335
1940	1,932
1941	1,792
1942	1,932
1943	1,946
1944	1,797
1945	2,428
1946	2,662
1947	2,682
1948	2,449
1949	2,779
1950	3,322
1951	2,316
1952	1,649
1953	3,045
1954	2,777
1955	2,919
1956	2,758
1957	1,906
1958	2,521
1959	3,461
1960	2,615
1961	2,837
1962	2,520
1963	2,391
1964	2,959
1965	2,278
1966	2,632
1967	2,910
1968	2,912
1969	2,360
1970	2,192
1971	3,168
1972	3,568
1973	2,357
1974	3,470
1975	3,244
1976	2,472
1977	2,461
1978	1,895
1979	2,352
1980	2,526
1981	2,670
1982	2,877
1983	2,614
1984	2,823
1985	2,113
1986	2,267
1987	1,831
1988	2,848
1989	2,645
1990	3,328
1991	2,489
1992	1,667
1993	1,727
1994	2,249
1995	2,841
1996	2,510
1997	3,737
1998	2,266
1999	2,778
2000	1,865
2001	2,135
2002	2,475
2003	2,677
2004	2,680
2005	2,062
2006	2,731
2007	2,599
2008	2,478
2009	3,028
2010	2,482
2011	2,683
2012	2,795
2013	2,258
2014	3,011
2015	2,311
2016	2,604
2017	2,746
2018	2,549
2019	1,549
2020	2,639
2021	2,693
2022	2,308
2023	1,837
2024	2,419

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	1929–2024
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1929 to 2024 is held.
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 Stillaguamish and what each holds
Gauge	Measures	Values	Record
NF STILLAGUAMISH RIVER NEAR ARLINGTON, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	230	1928–2026
SF STILLAGUAMISH RIVER NEAR GRANITE FALLS, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow	140	1928–2026

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 — 17110008. 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
NF STILLAGUAMISH RIVER NEAR ARLINGTON, 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	2026-08-26
SF STILLAGUAMISH RIVER NEAR GRANITE FALLS, 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	2026-08-26

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	99	yes, 20 or more
Values held	370	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-12167000.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), Stillaguamish gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-stillaguamish/

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 Stillaguamish 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 confidence2025-02-23

Source: USGS — National Water Information System, USGS site 12167000, 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.