The monitoring network within this area

Hydrionis holds 3,035 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

3,035

Values held

1905–2026

Record spans

Gauges within the Middle Fork Willamette 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 MF WILLAMETTE RIVER BLW N FORK, NR OAKRIDGE, OR.

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1912–2024.

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	MF WILLAMETTE RIVER BLW N FORK, NR OAKRIDGE, OR. (m³/s)
1912	985
1923	323
1924	765
1926	555
1927	1,560
1928	838
1929	606
1931	793
1932	1,184
1933	583
1934	515
1936	544
1937	838
1938	665
1939	292
1940	265
1941	940
1942	1,512
1943	507
1945	603
1946	906
1948	1,076
1950	447
1952	493
1953	1,682
1954	354
1955	2,064
1956	1,682
1958	1,005
1959	507
1960	422
1961	844
1962	374
1963	357
1964	1,580
1966	360
1967	320
1968	371
1970	453
1971	1,039
1972	765
1974	521
1975	399
1976	708
1977	86.4
1978	552
1980	597
1981	1,017
1983	371
1984	385
1986	971
1987	326
1989	612
1990	767
1991	374
1993	493
1994	164
1995	490
1996	694
1998	365
2000	416
2001	202
2002	464
2003	419
2004	456
2005	850
2007	442
2008	345
2010	459
2011	1,062
2012	518
2014	634
2015	521
2017	311
2019	983
2020	317
2022	391
2024	425

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	1912–2024
Completeness	69.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	26 separate periods inside 1912–2024 hold no value. The longest runs from 1913 to 1922 — 10 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1912 and is not continuous from it: 113 years separate the first value from the last, and 69% 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 MF WILLAMETTE RIVER BLW N FORK, NR OAKRIDGE, OR., as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1924–2024.

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	MF WILLAMETTE RIVER BLW N FORK, NR OAKRIDGE, OR. (mm)
1924	893
1925	1,009
1926	813
1927	1,167
1928	818
1929	766
1930	607
1931	602
1932	1,167
1933	1,108
1934	824
1935	790
1936	909
1937	1,121
1938	1,065
1939	767
1940	716
1941	733
1942	1,116
1943	1,158
1944	577
1945	1,157
1946	1,229
1947	1,028
1948	1,284
1949	975
1950	1,606
1951	1,273
1952	1,002
1953	1,530
1954	962
1955	1,356
1956	1,379
1957	1,057
1958	1,149
1959	765
1960	1,117
1961	1,034
1962	1,026
1963	963
1964	1,376
1965	969
1966	947
1967	837
1968	875
1969	999
1970	1,069
1971	1,470
1972	1,429
1973	987
1974	1,340
1975	1,330
1976	935
1977	839
1978	792
1979	988
1980	934
1981	978
1982	1,351
1983	1,260
1984	1,445
1985	877
1986	1,131
1987	711
1988	911
1989	996
1990	928
1991	1,058
1992	589
1993	1,140
1994	633
1995	1,344
1996	1,771
1997	1,304
1998	1,199
1999	1,299
2000	1,011
2001	700
2002	864
2003	978
2004	1,031
2005	812
2006	1,292
2007	958
2008	1,140
2009	985
2010	1,114
2011	1,222
2012	1,471
2013	846
2014	1,358
2015	828
2016	1,121
2017	1,296
2018	693
2019	912
2020	848
2021	733
2022	1,018
2023	909
2024	1,152

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	1924–2024
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1924 to 2024 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

The snow standing above this water

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

1,323

Fullest snowpack recorded at Cascade Summit, in 1999 (mm of water)

163

Thinnest, in 2015 (mm of water)

March

Month the pack is usually at its fullest

June

Month the pack has gone by, in half of years

Peak snowpack at Cascade Summit

Water years 1981–2026. 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	Cascade Summit (mm)
1981	365
1982	1,227
1983	991
1984	993
1985	991
1986	687
1987	704
1988	588
1989	1,123
1990	642
1991	567
1992	433
1993	999
1994	517
1995	670
1996	535
1997	893
1998	647
1999	1,323
2000	951
2001	513
2002	983
2003	530
2004	898
2005	442
2006	1,061
2007	805
2008	1,306
2009	921
2010	681
2011	1,280
2012	815
2013	740
2014	499
2015	163
2016	760
2017	911
2018	572
2019	794
2020	699
2021	778
2022	607
2023	1,040
2024	841
2025	968
2026	203

Read against the river

Cascade Summit and MF WILLAMETTE RIVER ABV SALT CRK, NEAR OAKRIDGE,OR both sit in this drainage area, and their records overlap by 44 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 Middle Fork Willamette and what each holds
Gauge	Measures	Values	Record
MF WILLAMETTE RIVER BLW N FORK, NR OAKRIDGE, OR.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	343	1912–2026
MF WILLAMETTE RIVER ABV SALT CRK, NEAR OAKRIDGE,OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	308	1914–2026
MIDDLE FORK WILLAMETTE RIVER AT JASPER, OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	276	1905–2026
N FK OF M FK WILLAMETTE R NR OAKRIDGE, OR	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	235	1909–2026
SALMON CREEK NEAR OAKRIDGE,OREG.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	229	1913–2026

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 — 17090001. 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
MF WILLAMETTE RIVER BLW N FORK, NR OAKRIDGE, OR.	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
MF WILLAMETTE RIVER ABV SALT CRK, NEAR OAKRIDGE,OR	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
MIDDLE FORK WILLAMETTE RIVER AT JASPER, OR	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
N FK OF M FK WILLAMETTE R NR OAKRIDGE, OR	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
SALMON CREEK NEAR OAKRIDGE,OREG.	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	122	yes, 20 or more
Values held	3,035	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-14148000.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), Middle Fork Willamette gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-middle-fork-willamette/

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 Middle Fork Willamette 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 confidence2024-12-29

Source: USGS — National Water Information System, USGS site 14148000, 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.