The monitoring network within this area

Hydrionis holds 1,818 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

1,818

Values held

1904–2026

Record spans

Gauges within the Upper Pit 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 PIT R NR CANBY CA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1904–2025.

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	PIT R NR CANBY CA (m³/s)
1904	368
1905	39.9
1932	61.4
1933	17.1
1935	51.5
1936	79.3
1937	47.9
1939	26.4
1940	121
1941	60.9
1942	92.9
1943	93.2
1944	21.6
1945	48.1
1947	25.4
1948	36.8
1949	53.5
1950	27.1
1951	29.4
1952	166
1953	75.9
1954	28.9
1955	14.7
1957	64.3
1958	76.5
1959	15.5
1960	75.3
1961	16.1
1962	37.7
1964	75.6
1966	23.4
1967	123
1968	67.1
1969	103
1970	189
1971	162
1972	129
1973	33.1
1974	81.6
1975	45.9
1976	12.7
1977	14.2
1978	42.2
1979	39.1
1980	167
1982	140
1983	72.8
1985	22.2
1986	260
1987	19.2
1988	43.0
1989	89.5
1990	24.9
1991	65.1
1992	6.71
1993	94.0
1994	18.6
1995	159
1996	111
1997	206
1998	110
1999	87.8
2000	23.8
2001	7.59
2002	25.9
2003	54.1
2004	82.4
2005	106
2006	110
2007	14.4
2008	52.7
2009	18.7
2010	22.3
2011	94.3
2012	27.7
2013	9.40
2015	28.1
2016	60.9
2017	165
2018	52.1
2019	103
2020	32.0
2022	27.8
2023	80.1
2024	29.7
2025	185

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	1904–2025
Completeness	70.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	11 separate periods inside 1904–2025 hold no value. The longest runs from 1906 to 1931 — 26 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1904 and is not continuous from it: 122 years separate the first value from the last, and 70% 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 SF PIT R NR LIKELY 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. 1929–2025.

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	SF PIT R NR LIKELY CA (mm)
1929	60.0
1930	70.0
1931	33.0
1932	112
1933	52.0
1934	40.0
1935	105
1936	102
1937	73.0
1938	156
1939	68.0
1940	71.0
1941	83.0
1942	138
1943	152
1944	94.0
1945	135
1946	105
1947	65.0
1948	95.0
1949	108
1950	80.0
1951	119
1952	197
1953	154
1954	89.0
1955	80.0
1956	154
1957	150
1958	169
1959	69.0
1960	71.0
1961	54.0
1962	78.0
1963	119
1964	138
1965	164
1966	70.0
1967	113
1968	86.0
1969	158
1970	131
1971	249
1972	176
1973	134
1974	147
1975	178
1976	90.0
1977	64.0
1978	93.0
1979	89.0
1980	125
1981	83.0
1982	138
1983	220
1984	251
1985	116
1986	151
1987	79.0
1988	67.0
1989	109
1990	65.0
1991	87.0
1992	51.0
1993	135
1994	84.0
1995	219
1996	198
1997	140
1998	225
1999	146
2000	82.0
2001	53.0
2002	72.0
2003	101
2004	101
2005	142
2006	159
2007	63.0
2008	93.0
2009	91.0
2010	81.0
2011	194
2012	64.0
2013	64.0
2014	61.0
2015	62.0
2016	142
2017	150
2018	88.0
2019	168
2020	75.0
2021	53.0
2022	61.0
2023	105
2024	106
2025	132

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	1929–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1929 to 2025 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

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

718

Fullest snowpack recorded at Cedar Pass, in 1995 (mm of water)

95

Thinnest, in 2026 (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 Cedar Pass

Water years 1979–2026. 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	Cedar Pass (mm)
1979	377
1980	705
1981	294
1982	537
1983	622
1984	572
1985	481
1986	583
1987	370
1988	270
1989	604
1990	303
1991	405
1992	210
1993	660
1994	314
1995	718
1996	517
1997	500
1998	690
1999	639
2000	395
2001	285
2002	481
2003	389
2004	518
2005	440
2006	558
2007	270
2008	438
2009	382
2010	406
2011	654
2012	282
2013	280
2014	204
2015	123
2016	505
2017	536
2018	271
2019	548
2020	355
2021	385
2022	280
2023	664
2024	516
2025	575
2026	95.0

Read against the river

Cedar Pass and SF PIT R NR LIKELY CA both sit in this drainage area, and their records overlap by 46 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 Pit and what each holds
Gauge	Measures	Values	Record
SF PIT R NR LIKELY CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	325	1928–2026
PIT R NR CANBY CA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	321	1904–2026
PIT R NR BIEBER CA	catchment area, annual maximum river flow	35	1907–2026
ASH C A ADIN CA	catchment area, annual maximum river flow	27	1904–2026
PIT R NR LOOKOUT CA	catchment area, annual maximum river flow	16	1959–2026
NF PIT R A ALTURAS CA	catchment area, annual maximum river flow	14	1972–2026

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 — 18020002. 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
SF PIT R NR LIKELY 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
PIT R NR CANBY 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
PIT R NR BIEBER 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
ASH C A ADIN 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
PIT R NR LOOKOUT 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
NF PIT R A ALTURAS 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 4 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	123	yes, 20 or more
Values held	1,818	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-11345500.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 Pit gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-pit/

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 Pit 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 confidence2025-04-27

Source: USGS — National Water Information System, USGS site 11345500, 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.