The monitoring network within this area

Hydrionis holds 3,449 values from 5 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.

5

Gauges

3,449

Values held

1897–2026

Record spans

Gauges within the Upper Skagit huc8 subbasin

5 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 AT NEWHALEM, 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 AT NEWHALEM, WA (m³/s)
1897	1,359
1909	762
1911	722
1912	561
1913	790
1914	586
1921	889
1923	606
1924	889
1925	719
1926	261
1927	736
1928	770
1930	379
1931	439
1932	1,274
1933	799
1934	708
1935	858
1936	634
1937	637
1939	634
1940	428
1942	493
1943	578
1944	317
1945	586
1946	691
1947	382
1948	428
1949	334
1950	501
1951	340
1953	558
1954	527
1955	569
1957	309
1958	225
1959	337
1961	694
1962	433
1964	818
1965	496
1966	532
1967	1,039
1968	487
1970	314
1971	623
1972	753
1974	665
1975	555
1977	694
1978	331
1979	360
1980	442
1982	527
1983	476
1984	476
1986	229
1987	221
1988	220
1989	323
1990	782
1992	224
1993	216
1994	219
1995	225
1997	844
1999	470
2000	204
2002	416
2003	229
2005	498
2006	796
2008	501
2009	289
2011	323
2012	399
2014	433
2016	260
2017	493
2019	247
2020	272
2021	394
2022	199
2023	405
2024	224

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	68.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	26 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 68% 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 BAKER RIVER AT HENRY THOMPSON BR AT 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. 1911–2025.

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	BAKER RIVER AT HENRY THOMPSON BR AT CONCRETE, WA (mm)
1911	2,648
1912	2,703
1913	3,087
1914	2,754
1944	2,172
1945	2,869
1946	3,043
1947	3,059
1948	2,896
1949	3,209
1950	3,905
1951	2,871
1952	2,320
1953	3,483
1954	3,664
1955	3,170
1956	3,479
1957	2,517
1958	3,248
1959	3,267
1960	3,174
1961	3,172
1962	2,922
1963	2,946
1964	3,372
1965	2,814
1966	3,069
1967	3,768
1968	3,546
1969	2,848
1970	2,492
1971	3,801
1972	3,773
1973	2,595
1974	4,028
1975	3,567
1976	2,992
1977	2,863
1978	2,468
1979	2,534
1980	3,762
1981	2,999
1982	3,189
1983	3,190
1984	3,162
1985	2,743
1986	2,937
1987	2,476
1988	3,164
1989	3,050
1990	3,547
1991	3,241
1992	2,597
1993	2,465
1994	2,678
1995	3,739
1996	3,052
1997	3,901
1998	2,753
1999	3,881
2000	2,830
2001	2,445
2002	3,100
2003	3,181
2004	2,975
2005	2,535
2006	3,065
2007	3,343
2008	2,743
2009	2,993
2010	3,110
2011	3,406
2012	3,523
2013	3,161
2014	3,790
2015	2,903
2016	3,357
2017	3,421
2018	3,324
2019	2,389
2020	3,368
2021	3,571
2022	2,793
2023	2,415
2024	2,789
2025	2,984

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	Derived Computed by Hydrionis
Period held	1911–2025
Completeness	74.8% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1911–2025 holds no value: 1915 to 1943, 29 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1911 and is not continuous from it: 115 years separate the first value from the last, and 75% of the years between them are held. The span is not the record.
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

The snow standing above this water

7 automated snow stations sit inside this drainage area, weighing the snowpack rather than measuring how deep it is.

2,022

Fullest snowpack recorded at Harts Pass, in 1991 (mm of water)

454

Thinnest, in 2005 (mm of water)

April

Month the pack is usually at its fullest

July

Month the pack has gone by, in half of years

Peak snowpack at Harts Pass

Water years 1983–2026. Each point is the fullest month of that snow season.

A water year runs October to September and is named for the year it ends, so the snow of one winter stays in one point. The value is the fullest month, not the fullest day: a pack that peaked sharply mid-month reads lower here than a single measurement taken at the right moment would.

View the data behind this chart

Underlying data
Period	Harts Pass (mm)
1983	1,258
1984	1,091
1985	1,121
1986	1,059
1987	869
1988	954
1989	1,146
1990	1,248
1991	2,022
1992	874
1993	817
1994	749
1995	1,400
1996	1,440
1997	1,444
1998	1,112
1999	1,764
2000	871
2001	586
2002	1,292
2003	889
2004	828
2005	454
2006	1,207
2007	1,261
2008	1,098
2009	834
2010	881
2011	1,705
2012	1,368
2013	1,153
2014	1,283
2015	961
2016	1,384
2017	1,468
2018	1,437
2019	934
2020	1,155
2021	1,395
2022	1,381
2023	1,177
2024	877
2025	900
2026	1,473

Read against the river

Harts Pass and SKAGIT RIVER AT NEWHALEM, WA both sit in this drainage area, and their records overlap by 42 years. That is the span the two have in common, not a count of years both actually hold — either record may have gaps inside it. The two are shown separately rather than on one axis: millimetres of stored water and cubic metres per second are not commensurable, and a difference between them would mean nothing.

Being in the same drainage area does not put the snowpack upstream of the gauge. A subbasin is an area, and snow on one tributary can join the river below a gauge on another — so a weak relationship here may say more about which tributary was measured than about the snow.

Every gauge Hydrionis holds within this area

Gauges within the Upper Skagit and what each holds
Gauge	Measures	Values	Record
SKAGIT RIVER AT NEWHALEM, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	275	1897–2026
BAKER RIVER AT CONCRETE, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	244	1910–2026
BAKER RIVER AT HENRY THOMPSON BR AT CONCRETE, WA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	225	1910–2026
CASCADE RIVER AT MARBLEMOUNT, WA	catchment area, annual maximum river flow	76	1897–2026
STETATTLE CREEK NEAR NEWHALEM, WA	catchment area, annual maximum river flow	51	1933–2026

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 — 17110005. 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 AT NEWHALEM, 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
BAKER RIVER AT 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
BAKER RIVER AT HENRY THOMPSON BR AT 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
CASCADE RIVER AT MARBLEMOUNT, 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
STETATTLE CREEK NEAR NEWHALEM, 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 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	5	yes, 3 or more
Years spanned	130	yes, 20 or more
Values held	3,449	yes, 1000 or more
Distinct measurements	6	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-12178000.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 Skagit gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-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 Upper 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 confidence2024-11-17

Source: USGS — National Water Information System, USGS site 12178000, 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.