The monitoring network within this area

Hydrionis holds 1,315 values from 7 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

1,315

Values held

1911–2026

Record spans

Gauges within the Middle Fork Feather huc8 subbasin

7 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 LOST C NR CLIPPER MILLS CA

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	LOST C NR CLIPPER MILLS CA (m³/s)
1928	82.1
1929	15.9
1931	11.3
1932	18.4
1933	7.39
1934	11.9
1935	41.3
1936	60.6
1937	12.3
1939	7.02
1940	79.3
1941	66.8
1949	10.8
1950	86.1
1952	36.5
1953	73.6
1954	34.8
1955	10.1
1957	87.2
1958	79.0
1959	37.4
1960	122
1961	15.9
1962	13.6
1964	6.63
1966	7.39
1967	17.4
1968	19.8
1969	68.0
1970	75.9
1971	19.4
1972	16.6
1974	77.0
1975	10.6
1976	0.850
1977	23.2
1978	20.6
1979	2.55
1980	52.1
1981	0.708
1983	73.9
1985	0.680
1986	104
1987	0.708
1989	16.8
1990	0.651
1991	0.736
1992	0.481
1993	22.7
1994	0.340
1995	40.5
1996	53.0
1997	163
1998	31.4
1999	26.7
2000	25.1
2002	0.595
2003	19.4
2004	0.566
2005	24.5
2006	43.0
2007	1.93
2009	16.7
2010	21.0
2011	30.6
2012	29.2
2014	1.05
2015	0.821
2016	0.680
2017	95.7
2018	24.6
2019	38.8
2020	11.9
2022	6.80
2023	34.5
2024	20.3
2025	32.3

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	78.6% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	15 separate periods inside 1928–2025 hold no value. The longest runs from 1942 to 1948 — 7 years with no reading. 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 79% 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 LOST C NR CLIPPER MILLS CA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1928–2024.

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	LOST C NR CLIPPER MILLS CA (mm)
1928	795
1929	275
1930	561
1931	77.0
1932	652
1933	261
1934	285
1935	841
1936	931
1937	801
1938	1,719
1939	229
1940	1,399
1949	405
1950	1,096
1951	1,011
1952	1,597
1953	1,252
1954	864
1955	953
1956	1,299
1957	827
1958	1,575
1959	445
1960	640
1961	398
1962	1,102
1963	306
1964	174
1965	517
1966	148
1967	188
1968	88.0
1969	403
1970	492
1971	16.0
1972	16.0
1973	7.00
1974	472
1975	16.0
1976	14.0
1977	20.0
1978	82.0
1979	20.0
1980	575
1981	360
1982	605
1983	942
1984	141
1985	17.0
1986	632
1987	46.0
1988	55.0
1989	355
1990	53.0
1991	56.0
1992	57.0
1993	722
1994	56.0
1995	2,294
1996	1,321
1997	1,453
1998	1,471
1999	464
2000	424
2001	88.0
2002	97.0
2003	328
2004	100
2005	521
2006	1,447
2007	91.0
2008	94.0
2009	225
2010	297
2011	1,619
2012	265
2013	101
2014	98.0
2015	98.0
2016	93.0
2017	1,149
2018	299
2019	1,229
2020	302
2021	96.0
2022	97.0
2023	846
2024	512

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	1928–2024
Completeness	91.8% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1928–2024 holds no value: 1941 to 1948, 8 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1928 and is not continuous from it: 97 years separate the first value from the last, and 92% 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

Every gauge Hydrionis holds within this area

Gauges within the Middle Fork Feather and what each holds
Gauge	Measures	Values	Record
LOST C NR CLIPPER MILLS CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	308	1927–2026
SF FEATHER R BL LITTLE GRASS VALLEY DAM CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	246	1927–2026
SF FEATHER R A ENTERPRISE CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	200	1911–2026
MF FEATHER R NR CLIO CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	198	1925–2026
FEATHER R A BIDWELL BAR CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	195	1911–2026
PALERMO CN A ENTERPRISE CA	burned area within 50 km, mean river flow, mean river flow, water year	142	1911–2019
BIG GRIZZLY C AT GRIZZLY VALLEY DAM NR PORTOLA CA	catchment area, annual maximum river flow	26	1926–2026

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 — 18020123. 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
LOST C NR CLIPPER MILLS CA	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
SF FEATHER R BL LITTLE GRASS VALLEY DAM CA	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
SF FEATHER R A ENTERPRISE CA	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 FEATHER R NR CLIO CA	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
FEATHER R A BIDWELL BAR CA	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
PALERMO CN A ENTERPRISE CA	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
BIG GRIZZLY C AT GRIZZLY VALLEY DAM NR PORTOLA CA	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	6	yes, 3 or more
Years spanned	116	yes, 20 or more
Values held	1,315	yes, 1000 or more
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-11396000.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 Feather gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-middle-fork-feather/

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 Feather 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 confidence2025-02-14

Source: USGS — National Water Information System, USGS site 11396000, 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.