The monitoring network within this area

Hydrionis holds 848 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

848

Values held

1835–2026

Record spans

Gauges within the Lower 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 NEAR MOUNT MORRIS NY

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1890–2025.

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 NEAR MOUNT MORRIS NY (m³/s)
1890	566
1894	1,189
1904	340
1905	425
1909	680
1910	510
1911	396
1912	467
1913	1,076
1914	532
1916	1,560
1917	900
1918	821
1919	906
1920	586
1921	507
1922	413
1923	345
1924	569
1925	753
1926	411
1927	470
1929	736
1930	555
1931	368
1932	453
1933	513
1934	405
1935	411
1936	745
1937	510
1938	510
1939	722
1940	838
1941	697
1942	917
1944	481
1945	631
1946	654
1947	866
1948	784
1949	362
1950	1,286
1952	269
1954	391
1955	362
1956	337
1957	328
1958	303
1959	343
1960	294
1961	261
1962	278
1963	297
1964	311
1965	242
1966	237
1967	207
1968	244
1969	252
1970	212
1971	237
1972	504
1974	228
1975	224
1976	283
1977	294
1978	292
1979	269
1980	244
1981	269
1982	292
1983	262
1984	297
1985	241
1987	256
1988	167
1989	277
1990	183
1992	204
1993	267
1994	275
1995	167
1996	222
1997	217
1998	241
1999	208
2000	178
2001	205
2002	177
2003	215
2004	202
2005	192
2006	201
2007	216
2008	195
2009	242
2010	224
2011	238
2012	195
2014	216
2015	209
2016	168
2017	206
2018	205
2020	198
2021	168
2023	179
2024	196
2025	196

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	1890–2025
Completeness	80.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	14 separate periods inside 1890–2025 hold no value. The longest runs from 1895 to 1903 — 9 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1890 and is not continuous from it: 136 years separate the first value from the last, and 81% 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 ROCHESTER 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. 1906–2004.

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 (0 events)

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 ROCHESTER NY (mm)
1906	324
1911	362
1912	318
1913	377
1915	314
1916	502
1917	383
1920	299
1921	311
1922	307
1923	310
1924	401
1925	367
1926	377
1927	547
1928	424
1929	470
1930	378
1931	310
1932	400
1933	342
1934	233
1935	339
1936	388
1937	407
1938	338
1939	344
1940	402
1941	273
1942	452
1943	502
1944	334
1945	615
1946	361
1947	521
1948	370
1949	272
1950	445
1951	435
1952	397
1953	316
1954	346
1955	362
1956	540
1957	333
1958	329
1959	448
1960	401
1961	350
1962	266
1963	262
1964	299
1965	260
1966	315
1967	411
1968	346
1969	394
1970	426
1971	358
1972	661
1973	422
1974	429
1975	470
1976	555
1977	598
1978	420
1979	523
1980	355
1981	459
1982	477
1983	385
1984	561
1985	374
1986	394
1987	341
1988	229
1989	375
1990	485
1991	326
1992	465
1993	422
1994	406
1995	247
1996	564
1997	380
1998	409
1999	248
2000	382
2001	260
2002	368
2003	522
2004	545

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	1906–2004
Completeness	92.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	3 separate periods inside 1906–2004 hold no value. The longest runs from 1907 to 1910 — 4 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1906 and is not continuous from it: 99 years separate the first value from the last, and 93% of the years between them are held. The span is not the record.
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 Lower Genesee and what each holds
Gauge	Measures	Values	Record
GENESEE RIVER AT ROCHESTER NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	286	1835–2026
GENESEE RIVER NEAR MOUNT MORRIS NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	268	1890–2026
GENESEE RIVER AT FORD STREET BRIDGE, ROCHESTER NY	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	249	1835–2026
CONESUS CREEK NEAR LAKEVILLE NY	catchment area, annual maximum river flow	45	1920–2026

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 — 04130003. 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 ROCHESTER 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 NEAR MOUNT MORRIS 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 FORD STREET BRIDGE, ROCHESTER 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
CONESUS CREEK NEAR LAKEVILLE 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	192	yes, 20 or more
Values held	848	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-04232000.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), Lower Genesee gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-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 Lower 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 confidence2005-04-04

Source: USGS — National Water Information System, USGS site 04232000, 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.