The monitoring network within this area

Hydrionis holds 341 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

341

Values held

1909–2026

Record spans

Gauges within the Embarras 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 EMBARRAS RIVER AT STE. MARIE, IL

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1910–2025.

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	EMBARRAS RIVER AT STE. MARIE, IL (m³/s)
1910	261
1911	371
1915	411
1916	399
1917	668
1918	236
1919	228
1921	198
1922	796
1923	470
1924	292
1926	269
1927	1,104
1929	668
1930	714
1931	97.1
1932	236
1933	637
1934	103
1935	357
1936	239
1937	490
1938	1,059
1939	677
1940	252
1941	127
1942	283
1943	906
1944	405
1945	722
1946	396
1947	201
1948	827
1949	552
1950	1,269
1951	561
1952	241
1953	144
1954	11.6
1955	136
1956	272
1957	1,127
1959	549
1960	357
1961	1,070
1962	595
1963	357
1964	217
1965	133
1966	171
1967	1,056
1969	674
1970	561
1971	235
1972	211
1973	371
1974	617
1975	552
1976	362
1977	211
1978	470
1979	702
1980	214
1981	212
1982	623
1984	779
1985	799
1987	155
1988	473
1989	422
1990	663
1992	300
1993	597
1995	694
1996	903
1997	459
1998	445
1999	665
2000	253
2002	1,099
2003	245
2004	413
2005	861
2006	396
2007	368
2008	1,710
2009	719
2011	765
2012	263
2013	680
2014	326
2015	360
2017	966
2019	357
2020	753
2021	283
2022	436
2023	419
2024	225
2025	708

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	1910–2025
Completeness	86.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	14 separate periods inside 1910–2025 hold no value. The longest runs from 1912 to 1914 — 3 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1910 and is not continuous from it: 116 years separate the first value from the last, and 86% 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 EMBARRAS RIVER AT STE. MARIE, IL, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1910–2025.

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	EMBARRAS RIVER AT STE. MARIE, IL (mm)
1910	236
1911	346
1915	300
1916	264
1917	234
1918	325
1919	280
1920	213
1921	240
1922	307
1923	265
1924	322
1925	153
1926	347
1927	673
1928	288
1929	444
1930	249
1931	136
1932	181
1933	380
1934	144
1935	284
1936	155
1937	343
1938	333
1939	311
1940	100
1941	138
1942	348
1943	324
1944	178
1945	379
1946	295
1947	239
1948	259
1949	399
1950	557
1951	388
1952	254
1953	121
1954	10.0
1955	146
1956	155
1957	533
1958	321
1959	210
1960	179
1961	249
1962	299
1963	90.0
1964	136
1965	133
1966	190
1967	340
1968	292
1969	341
1970	223
1971	179
1972	232
1973	490
1974	552
1975	413
1976	156
1977	168
1978	310
1979	444
1980	177
1981	263
1982	537
1983	331
1984	368
1985	483
1986	159
1987	150
1988	212
1989	280
1990	395
1991	270
1992	317
1993	644
1994	253
1995	224
1996	405
1997	255
1998	385
1999	303
2000	264
2001	312
2002	429
2003	166
2004	363
2005	262
2006	282
2007	252
2008	580
2009	559
2010	301
2011	477
2012	128
2013	409
2014	294
2015	374
2016	305
2017	315
2018	404
2019	479
2020	479
2021	392
2022	327
2023	181
2024	204
2025	210

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	1910–2025
Completeness	97.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1910–2025 holds no value: 1912 to 1914, 3 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1910 and is not continuous from it: 116 years separate the first value from the last, and 97% 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 Embarras and what each holds
Gauge	Measures	Values	Record
EMBARRAS RIVER AT STE. MARIE, IL	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	340	1909–2026
EMBARRAS RIVER NEAR OAKLAND, IL	catchment area	1	2026–2026

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 — 05120112. 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
EMBARRAS RIVER AT STE. MARIE, IL	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
EMBARRAS RIVER NEAR OAKLAND, IL	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	1	no
Years spanned	118	yes, 20 or more
Values held	341	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-03345500.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), Embarras gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-embarras/

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 Embarras 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 03345500, 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.