The monitoring network within this area

Hydrionis holds 562 values from 3 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

562

Values held

1913–2026

Record spans

Gauges within the Seneca huc8 subbasin

3 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 FALL CREEK NEAR ITHACA NY

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1926–2025.

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	FALL CREEK NEAR ITHACA NY (m³/s)
1926	63.4
1927	83.5
1929	95.4
1930	64.0
1931	50.1
1932	61.4
1933	48.1
1934	98.5
1935	439
1936	143
1937	53.2
1939	125
1940	122
1941	110
1942	131
1944	93.7
1945	82.7
1946	70.2
1947	147
1948	99.4
1950	145
1952	84.4
1954	97.1
1955	83.3
1956	142
1957	46.7
1958	85.5
1959	133
1960	129
1961	114
1962	51.5
1964	150
1965	31.1
1966	56.9
1968	69.1
1969	91.2
1970	64.0
1971	77.0
1972	132
1974	62.3
1975	161
1976	77.9
1977	142
1979	127
1980	88.1
1981	68.5
1983	70.8
1984	129
1985	45.0
1986	96.8
1987	53.8
1988	48.4
1989	60.9
1990	66.8
1992	87.5
1993	127
1994	83.0
1996	268
1998	92.0
1999	70.5
2000	98.3
2001	63.1
2002	72.8
2003	53.8
2004	65.7
2005	175
2007	86.6
2008	87.5
2009	52.4
2010	89.2
2011	122
2012	34.3
2013	112
2014	70.5
2015	63.4
2016	51.8
2017	86.1
2019	48.4
2020	90.9
2021	127
2023	68.5
2025	80.4

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	1926–2025
Completeness	82.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	18 separate periods inside 1926–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1926 and is not continuous from it: 100 years separate the first value from the last, and 82% 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 FALL CREEK NEAR ITHACA 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. 1926–2025.

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	FALL CREEK NEAR ITHACA NY (mm)
1926	540
1927	679
1928	484
1929	588
1930	428
1931	392
1932	500
1933	377
1934	375
1935	636
1936	524
1937	613
1938	503
1939	384
1940	533
1941	339
1942	538
1943	638
1944	393
1945	784
1946	435
1947	631
1948	461
1949	383
1950	637
1951	492
1952	488
1953	336
1954	454
1955	507
1956	617
1957	387
1958	662
1959	546
1960	468
1961	575
1962	387
1963	379
1964	373
1965	259
1966	430
1967	491
1968	482
1969	442
1970	556
1971	505
1972	807
1973	479
1974	532
1975	602
1976	696
1977	790
1978	484
1979	547
1980	371
1981	623
1982	476
1983	499
1984	649
1985	375
1986	519
1987	392
1988	336
1989	459
1990	675
1991	376
1992	578
1993	647
1994	686
1995	339
1996	844
1997	402
1998	559
1999	338
2000	561
2001	401
2002	531
2003	694
2004	743
2005	593
2006	631
2007	576
2008	560
2009	419
2010	495
2011	729
2012	351
2013	559
2014	481
2015	483
2016	377
2017	679
2018	630
2019	561
2020	449
2021	676
2022	460
2023	506
2024	503
2025	473

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	1926–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1926 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 Seneca and what each holds
Gauge	Measures	Values	Record
FALL CREEK NEAR ITHACA NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	301	1925–2026
OWASCO OUTLET NEAR AUBURN NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	254	1913–2026
ERIE (BARGE) CANAL AT LOCK 30 AT MACEDON NY	annual maximum river flow	7	2019–2025

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 — 04140201. 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
FALL CREEK NEAR ITHACA 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
OWASCO OUTLET NEAR AUBURN 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
ERIE (BARGE) CANAL AT LOCK 30 AT MACEDON 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	114	yes, 20 or more
Values held	562	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-04234000.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), Seneca gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-seneca/

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 Seneca 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 confidence2025-03-06

Source: USGS — National Water Information System, USGS site 04234000, 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.