The monitoring network within this area

Hydrionis holds 1,585 values from 6 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.

6

Gauges

1,585

Values held

1911–2026

Record spans

Gauges within the Upper Yuba huc8 subbasin

6 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 CANYON C BL BOWMAN LK CA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1927–2025.

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	CANYON C BL BOWMAN LK CA (m³/s)
1927	22.5
1928	3.06
1929	7.39
1930	24.1
1931	1.44
1932	25.1
1933	2.41
1935	23.3
1936	41.3
1937	24.6
1938	30.9
1939	0.510
1940	25.0
1941	21.9
1942	20.0
1943	57.5
1944	1.16
1945	24.2
1946	30.9
1947	1.64
1948	41.9
1949	1.76
1950	43.0
1952	34.0
1953	26.3
1954	6.80
1955	2.44
1956	38.8
1957	25.5
1958	26.4
1959	4.33
1960	20.8
1962	20.8
1963	40.8
1964	24.5
1965	0.651
1967	19.4
1968	1.19
1969	31.7
1970	106
1971	40.8
1972	0.934
1973	8.07
1974	17.3
1975	15.2
1977	0.510
1979	2.04
1980	7.08
1981	1.39
1982	37.9
1983	25.1
1984	1.05
1986	112
1987	1.59
1989	2.83
1991	4.11
1992	2.10
1993	9.71
1994	1.25
1995	12.9
1996	89.2
1997	156
1998	36.2
1999	6.60
2000	9.43
2001	1.36
2002	1.70
2003	18.3
2004	1.47
2005	21.6
2007	2.18
2008	5.04
2009	10.6
2010	15.7
2011	11.7
2012	28.6
2014	2.24
2015	2.29
2016	17.8
2017	109
2018	58.0
2019	29.7
2020	7.82
2021	3.54
2022	8.41
2023	32.0
2024	24.2
2025	20.1

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	1927–2025
Completeness	88.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	11 separate periods inside 1927–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1927 and is not continuous from it: 99 years separate the first value from the last, and 89% 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 CANYON C BL BOWMAN LK 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	CANYON C BL BOWMAN LK CA (mm)
1928	121
1929	44.0
1930	275
1931	12.0
1932	706
1933	22.0
1934	10.0
1935	508
1936	373
1937	214
1938	989
1939	21.0
1940	957
1941	820
1942	1,078
1943	992
1944	19.0
1945	401
1946	513
1947	12.0
1948	453
1949	15.0
1950	1,155
1951	579
1952	1,743
1953	733
1954	206
1955	33.0
1956	1,056
1957	552
1958	587
1959	37.0
1960	244
1961	13.0
1962	258
1963	1,116
1964	761
1965	1,652
1966	53.0
1967	465
1968	48.0
1969	1,009
1970	543
1971	261
1972	67.0
1973	144
1974	465
1975	138
1976	32.0
1977	13.0
1978	38.0
1979	41.0
1980	138
1981	116
1982	1,000
1983	1,008
1984	243
1985	62.0
1986	1,033
1987	58.0
1988	55.0
1989	94.0
1990	59.0
1991	54.0
1992	61.0
1993	443
1994	52.0
1995	998
1996	969
1997	805
1998	982
1999	381
2000	173
2001	60.0
2002	63.0
2003	420
2004	76.0
2005	591
2006	1,468
2007	74.0
2008	80.0
2009	313
2010	735
2011	793
2012	293
2013	72.0
2014	65.0
2015	73.0
2016	1,284
2017	2,587
2018	783
2019	1,605
2020	156
2021	76.0
2022	145
2023	1,547
2024	878

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	1928–2024
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1928 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

1 automated snow station sits inside this drainage area, weighing the snowpack rather than measuring how deep it is.

1,818

Fullest snowpack recorded at Css Lab, in 2023 (mm of water)

152

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 Css Lab

Water years 1984–2026. 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	Css Lab (mm)
1984	990
1985	728
1986	1,197
1987	567
1988	461
1989	784
1990	477
1991	415
1992	418
1993	1,288
1994	547
1995	1,552
1996	879
1997	1,160
1998	1,250
1999	1,320
2000	1,085
2001	546
2002	798
2003	793
2004	846
2005	1,040
2006	1,330
2007	606
2008	909
2009	914
2010	1,043
2011	1,749
2012	557
2013	482
2014	203
2015	152
2016	874
2017	1,674
2018	393
2019	1,587
2020	425
2021	697
2022	700
2023	1,818
2024	950
2025	721
2026	378

Why the snow is not read against the river here

MILTON-BOWMAN TUNNEL OUTLET NR GRANITEVILLE CA measures a tunnel, not a natural channel. What passes through it is an operating decision — how much was diverted, and when — so comparing it with what the sky or the mountain delivered would describe the operator rather than the hydrology.

Every gauge Hydrionis holds within this area

Gauges within the Upper Yuba and what each holds
Gauge	Measures	Values	Record
CANYON C BL BOWMAN LK CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	331	1927–2026
MILTON-BOWMAN TUNNEL OUTLET NR GRANITEVILLE CA	burned area within 50 km, mean river flow, mean river flow, water year	229	1928–2024
BOWMAN-SPAULDING CN INTAKE NR GRANITEVILLE CA	burned area within 50 km, mean river flow, mean river flow, water year	225	1927–2024
OREGON C NR NORTH SAN JUAN CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	208	1911–2026
M YUBA R A MILTON CA	catchment area, annual maximum river flow	36	1926–2026
M YUBA R NR NORTH SAN JUAN CA	catchment area, annual maximum river flow	35	1912–2026

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 — 18020125. 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
CANYON C BL BOWMAN LK 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
MILTON-BOWMAN TUNNEL OUTLET NR GRANITEVILLE 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
BOWMAN-SPAULDING CN INTAKE NR GRANITEVILLE 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
OREGON C NR NORTH SAN JUAN 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
M YUBA R A MILTON 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
M YUBA R NR NORTH SAN JUAN 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	4	yes, 3 or more
Years spanned	116	yes, 20 or more
Values held	1,585	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-11416500.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 Yuba gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-yuba/

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 Yuba 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 confidence2025-04-18

Source: USGS — National Water Information System, USGS site 11416500, 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.