The monitoring network within this area

Hydrionis holds 625 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

625

Values held

1901–2026

Record spans

Gauges within the Middle Wabash-Little Vermilion 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 WABASH RIVER AT LAFAYETTE, IN

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1901–2025.

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	WABASH RIVER AT LAFAYETTE, IN (m³/s)
1901	872
1902	906
1904	1,982
1907	1,175
1908	1,614
1909	1,246
1910	1,388
1911	878
1912	1,300
1913	5,380
1914	1,164
1915	1,056
1916	2,152
1917	940
1918	1,733
1919	2,152
1920	1,693
1921	1,257
1922	1,654
1923	1,518
1924	1,693
1925	1,792
1926	1,634
1927	1,812
1929	1,076
1930	2,112
1931	371
1932	1,065
1933	1,911
1934	614
1935	1,048
1936	2,648
1937	1,657
1938	1,792
1939	2,107
1940	968
1941	413
1942	1,252
1943	3,710
1944	2,076
1945	1,320
1947	1,167
1948	1,169
1949	1,756
1950	2,549
1951	1,433
1952	1,186
1953	991
1954	467
1955	1,000
1956	850
1957	1,489
1958	2,803
1959	2,520
1960	1,119
1961	1,569
1962	1,303
1963	1,784
1964	1,651
1965	1,034
1966	413
1968	1,940
1969	1,957
1970	1,206
1971	878
1972	1,116
1973	1,152
1974	1,512
1975	1,019
1976	1,243
1977	668
1978	1,430
1979	1,407
1980	1,362
1981	1,260
1982	1,597
1983	1,722
1984	1,144
1985	2,277
1987	416
1988	943
1989	1,152
1990	1,509
1992	943
1993	1,770
1994	1,858
1995	872
1996	1,002
1997	1,552
1998	1,543
1999	1,730
2000	878
2001	985
2002	1,152
2003	2,265
2004	1,651
2005	2,265
2006	852
2007	1,438
2008	2,050
2009	1,676
2010	1,254
2011	1,654
2013	2,427
2014	1,458
2015	1,968
2017	1,354
2018	1,875
2019	1,085
2020	1,048
2021	966
2022	1,422
2023	1,195
2024	1,068
2025	915

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	1901–2025
Completeness	92.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	9 separate periods inside 1901–2025 hold no value. The longest runs from 1905 to 1906 — 2 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1901 and is not continuous from it: 125 years separate the first value from the last, and 92% 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 WABASH RIVER AT LAFAYETTE, IN, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1924–2024.

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	WABASH RIVER AT LAFAYETTE, IN (mm)
1924	405
1925	246
1926	432
1927	558
1928	245
1929	377
1930	307
1931	129
1932	253
1933	376
1934	117
1935	220
1936	244
1937	411
1938	336
1939	280
1940	138
1941	78.0
1942	291
1943	376
1944	235
1945	293
1946	224
1947	270
1948	318
1949	366
1950	609
1951	364
1952	395
1953	208
1954	152
1955	280
1956	214
1957	403
1958	347
1959	392
1960	241
1961	310
1962	275
1963	154
1964	197
1965	250
1966	214
1967	340
1968	335
1969	398
1970	303
1971	255
1972	442
1973	411
1974	418
1975	356
1976	264
1977	245
1978	323
1979	314
1980	318
1981	334
1982	497
1983	288
1984	326
1985	424
1986	343
1987	214
1988	198
1989	314
1990	539
1991	361
1992	381
1993	537
1994	282
1995	258
1996	348
1997	399
1998	487
1999	293
2000	189
2001	387
2002	324
2003	470
2004	378
2005	375
2006	400
2007	426
2008	465
2009	413
2010	318
2011	542
2012	206
2013	434
2014	456
2015	502
2016	303
2017	495
2018	419
2019	468
2020	305
2021	321
2022	298
2023	232
2024	297

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	1924–2024
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1924 to 2024 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 Middle Wabash-Little Vermilion and what each holds
Gauge	Measures	Values	Record
WABASH RIVER AT LAFAYETTE, IN	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	326	1901–2026
WABASH RIVER AT MONTEZUMA, IN	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	299	1913–2026

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 — 05120108. 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
WABASH RIVER AT LAFAYETTE, IN	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
WABASH RIVER AT MONTEZUMA, IN	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	126	yes, 20 or more
Values held	625	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-03335500.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), Middle Wabash-Little Vermilion gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-middle-wabash-little-vermilion/

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 Middle Wabash-Little Vermilion 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 confidence2025-04-06

Source: USGS — National Water Information System, USGS site 03335500, 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.