The monitoring network within this area

Hydrionis holds 651 values from 2 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

651

Values held

1908–2026

Record spans

Gauges within the Sacandaga huc8 subbasin

2 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 SACANDAGA RIVER AT STEWARTS BRIDGE NR HADLEY NY

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1908–2025.

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	SACANDAGA RIVER AT STEWARTS BRIDGE NR HADLEY NY (m³/s)
1908	436
1909	566
1910	436
1912	419
1913	1,005
1914	589
1915	320
1916	320
1917	362
1918	394
1919	337
1920	377
1921	334
1922	654
1923	566
1924	425
1925	411
1926	637
1927	419
1928	578
1929	521
1930	188
1931	144
1932	215
1934	136
1935	217
1936	208
1937	221
1938	143
1939	165
1940	212
1941	140
1942	221
1943	223
1945	223
1946	206
1947	226
1948	150
1949	147
1950	191
1951	220
1952	220
1953	242
1954	223
1955	159
1956	167
1957	158
1958	155
1959	156
1960	157
1961	156
1962	158
1964	145
1965	142
1966	239
1967	161
1968	365
1969	241
1970	169
1971	256
1972	306
1973	238
1974	162
1975	175
1976	337
1977	337
1979	300
1980	159
1981	230
1982	159
1983	377
1984	259
1985	297
1986	314
1988	159
1989	309
1990	348
1991	135
1992	226
1993	354
1994	217
1995	154
1996	227
1997	239
1998	258
2000	292
2001	160
2002	230
2003	157
2005	159
2006	402
2007	402
2008	396
2009	153
2011	467
2013	311
2014	202
2015	140
2017	300
2019	422
2021	141
2022	189
2024	274
2025	228

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	1908–2025
Completeness	88.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	14 separate periods inside 1908–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1908 and is not continuous from it: 118 years separate the first value from the last, and 88% 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 SACANDAGA RIVER NEAR HOPE NY, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1912–2025.

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	SACANDAGA RIVER NEAR HOPE NY (mm)
1912	787
1913	831
1914	633
1915	729
1916	862
1917	854
1918	746
1919	904
1920	710
1921	808
1922	907
1923	700
1924	877
1925	960
1926	899
1927	858
1928	794
1929	917
1930	651
1931	615
1932	844
1933	567
1934	533
1935	789
1936	906
1937	889
1938	748
1939	603
1940	777
1941	546
1942	775
1943	850
1944	628
1945	1,166
1946	688
1947	969
1948	768
1949	740
1950	809
1951	925
1952	818
1953	784
1954	816
1955	812
1956	684
1957	621
1958	588
1959	897
1960	645
1961	556
1962	653
1963	527
1964	528
1965	561
1966	593
1967	622
1968	722
1969	746
1970	688
1971	767
1972	1,077
1973	964
1974	767
1975	887
1976	1,202
1977	968
1978	682
1979	982
1980	588
1981	725
1982	742
1983	857
1984	877
1985	657
1986	862
1987	815
1988	575
1989	773
1990	1,061
1991	590
1992	806
1993	803
1994	873
1995	643
1996	1,059
1997	708
1998	770
1999	608
2000	967
2001	632
2002	785
2003	892
2004	765
2005	850
2006	1,197
2007	751
2008	958
2009	868
2010	878
2011	1,077
2012	655
2013	798
2014	888
2015	706
2016	632
2017	995
2018	897
2019	1,206
2020	679
2021	836
2022	792
2023	883
2024	758
2025	607

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	1912–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1912 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

Every gauge Hydrionis holds within this area

Gauges within the Sacandaga and what each holds
Gauge	Measures	Values	Record
SACANDAGA RIVER NEAR HOPE NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	343	1911–2026
SACANDAGA RIVER AT STEWARTS BRIDGE NR HADLEY NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	308	1908–2026

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 — 02020002. 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
SACANDAGA RIVER NEAR HOPE NY	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
SACANDAGA RIVER AT STEWARTS BRIDGE NR HADLEY NY	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 2 of them, which makes it a profile, not indexed.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	119	yes, 20 or more
Values held	651	no
Distinct measurements	4	yes, 2 or more
Publishers measuring it	1	no
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-01321000.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), Sacandaga gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-sacandaga/

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 Sacandaga 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 confidence2025-03-17

Source: USGS — National Water Information System, USGS site 01321000, 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.