The monitoring network within this area

Hydrionis holds 715 values from 4 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

715

Values held

1902–2026

Record spans

Gauges within the Upper Genesee huc8 subbasin

4 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 GENESEE RIVER AT PORTAGEVILLE NY

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1902–2025.

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	GENESEE RIVER AT PORTAGEVILLE NY (m³/s)
1902	1,416
1909	745
1911	357
1912	643
1913	1,212
1914	657
1915	606
1916	1,257
1917	569
1918	835
1919	929
1920	1,124
1921	513
1922	357
1923	620
1924	498
1925	496
1926	419
1927	447
1929	756
1930	580
1931	328
1932	402
1933	487
1934	430
1935	493
1936	722
1937	513
1938	487
1939	804
1940	750
1941	833
1942	915
1943	776
1944	430
1945	697
1946	714
1947	801
1948	682
1949	274
1950	1,014
1952	657
1953	595
1954	436
1955	586
1956	1,226
1957	558
1958	547
1959	1,065
1960	787
1961	855
1962	340
1963	694
1964	1,116
1965	326
1966	422
1967	1,339
1969	385
1970	504
1971	527
1972	2,549
1974	445
1975	716
1976	810
1977	711
1978	697
1979	671
1980	422
1981	631
1982	303
1984	1,096
1985	439
1986	549
1987	411
1988	371
1989	934
1990	510
1992	334
1993	651
1994	665
1995	493
1996	1,591
1998	1,158
1999	547
2000	439
2001	439
2002	453
2003	592
2004	654
2005	578
2007	855
2008	799
2009	634
2010	722
2012	266
2014	665
2015	422
2016	311
2017	770
2018	810
2020	365
2021	518
2022	699
2024	484
2025	513

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	1902–2025
Completeness	84.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	14 separate periods inside 1902–2025 hold no value. The longest runs from 1903 to 1908 — 6 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1902 and is not continuous from it: 124 years separate the first value from the last, and 85% 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 GENESEE RIVER AT PORTAGEVILLE 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. 1909–2025.

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	GENESEE RIVER AT PORTAGEVILLE NY (mm)
1909	375
1910	450
1911	487
1912	413
1913	480
1914	421
1915	479
1916	645
1917	565
1918	395
1919	417
1920	338
1921	347
1922	353
1923	302
1924	444
1925	388
1926	418
1927	627
1928	395
1929	536
1930	348
1931	332
1932	418
1933	342
1934	258
1935	410
1936	419
1937	474
1938	366
1939	395
1940	515
1941	277
1942	537
1943	523
1944	336
1945	676
1946	415
1947	539
1948	427
1949	284
1950	562
1951	475
1952	456
1953	381
1954	357
1955	396
1956	588
1957	376
1958	418
1959	536
1960	427
1961	422
1962	312
1963	232
1964	353
1965	334
1966	361
1967	532
1968	377
1969	384
1970	437
1971	363
1972	760
1973	450
1974	508
1975	572
1976	660
1977	769
1978	499
1979	532
1980	326
1981	438
1982	473
1983	362
1984	635
1985	367
1986	465
1987	406
1988	290
1989	480
1990	610
1991	341
1992	558
1993	478
1994	518
1995	319
1996	697
1997	478
1998	486
1999	330
2000	441
2001	295
2002	481
2003	700
2004	644
2005	507
2006	646
2007	518
2008	491
2009	466
2010	459
2011	693
2012	361
2013	427
2014	429
2015	434
2016	373
2017	593
2018	735
2019	520
2020	399
2021	527
2022	391
2023	342
2024	399
2025	389

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	1909–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1909 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 Upper Genesee and what each holds
Gauge	Measures	Values	Record
GENESEE RIVER AT PORTAGEVILLE NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	352	1902–2026
CANASERAGA CREEK NEAR DANSVILLE NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	168	1910–2026
GENESEE RIVER AT SCIO NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	167	1916–2026
KESHEQUA CR AT CRAIG COLONY AT SONYEA NY	catchment area, annual maximum river flow	28	1918–2026

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 — 04130002. 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
GENESEE RIVER AT PORTAGEVILLE 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
CANASERAGA CREEK NEAR DANSVILLE 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
GENESEE RIVER AT SCIO 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
KESHEQUA CR AT CRAIG COLONY AT SONYEA 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 3 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	3	yes, 3 or more
Years spanned	125	yes, 20 or more
Values held	715	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-04223000.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 Genesee gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-genesee/

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 Genesee 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 confidence2025-05-06

Source: USGS — National Water Information System, USGS site 04223000, 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.