HydrionisGlobal Water Intelligence
HUC8 subbasin

Upper Black

2 monitoring stations within this area in United States, holding 263 values between 1921 and 2026. A United States federal hydrologic unit at the eight-digit subbasin level — a drainage area, not a river. Many subbasins take the name of the largest river within them, and the gauges below are anywhere inside the area, including on tributaries.

United StatesHUC8 subbasin

The monitoring network within this area

Hydrionis holds 263 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.

2
Gauges
263
Values held
1921–2026
Record spans
Gauges within the Upper Black huc8 subbasin
2 monitoring points, positioned as the publisher records them.
Gauges within the Upper Black huc8 subbasinBlack River at Leeper, MO, St. Francis River at Fisk, MOBlack River at Leeper, MOSt. Francis River at Fisk, MO

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 Black River at Leeper, MO
The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1921–2025.
Shading marks when something was recorded, not what caused the line.
Largest measured flow of each year at Black River at Leeper, MOLargest measured flow of each year at Black River at Leeper, MO: Black River at Leeper, MO in m³/s, from 1921 to 2025.Hurricane Katrina water and sanitation collapse01,0002,000m³/s19211933194519561967197919932019

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.

EventTypePeriodStandingAuthority
Hurricane Katrina water and sanitation collapseFlood2005-08-29 – 2005-09-30Documented 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
PeriodBlack River at Leeper, MO (m³/s)
1921680
1923620
1924205
1925413
19271,249
19281,068
19291,045
1930524
1931170
1932159
19332,220
1934121
19352,047
1937804
19381,025
1939946
1940306
1941227
19431,540
1944408
19451,691
19461,201
1947963
1948357
1949212
1950234
1951157
1953112
1954103
1955323
195690.6
1957294
1958242
195993.4
1961178
1962116
1963103
1964250
1965143
1966184
196787.8
1969164
197084.4
197152.7
1972103
1973155
1975162
1976109
1977189
1978105
1979193
198192.9
1982122
1983118
1985112
198763.7
1989183
1990105
1991221
1992328
1993223
2008379
2009125
2011331
201293.2
2013191
2014166
2015161
2017374
2018198
2019164
2020277
2021115
2022179
2023234
2024109
2025251

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 existMeasured
Period held1921–2025
Completeness73.3% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps
  • 15 separate periods inside 1921–2025 hold no value. The longest runs from 1994 to 2007 — 14 years with no reading. They are drawn as breaks in the line and are never interpolated across.
ContinuityThe record begins in 1921 and is not continuous from it: 105 years separate the first value from the last, and 73% of the years between them are held. The span is not the record.
Last read from the publisher2026-10-01
RedistributionPermitted by the upstream licences
Commercial reusePermitted by the upstream licences. No Hydrionis access tier can widen this.
MethodologyHow 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 Black River at Leeper, MO, as a depth
The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1949–2025.
Shading marks when something was recorded, not what caused the line.
Water leaving the catchment above Black River at Leeper, MO, as a depthWater leaving the catchment above Black River at Leeper, MO, as a depth: Black River at Leeper, MO in mm, from 1949 to 2025.Hurricane Katrina water and sanitation collapse0200400600800mm19491957196519731981198920122020Black River at Leeper, MO 1949: 505 mmBlack River at Leeper, MO 1950: 574 mmBlack River at Leeper, MO 1951: 589 mmBlack River at Leeper, MO 1952: 321 mmBlack River at Leeper, MO 1953: 188 mmBlack River at Leeper, MO 1954: 158 mmBlack River at Leeper, MO 1955: 212 mmBlack River at Leeper, MO 1956: 177 mmBlack River at Leeper, MO 1957: 594 mmBlack River at Leeper, MO 1958: 383 mmBlack River at Leeper, MO 1959: 277 mmBlack River at Leeper, MO 1960: 236 mmBlack River at Leeper, MO 1961: 363 mmBlack River at Leeper, MO 1962: 280 mmBlack River at Leeper, MO 1963: 194 mmBlack River at Leeper, MO 1964: 221 mmBlack River at Leeper, MO 1965: 222 mmBlack River at Leeper, MO 1966: 353 mmBlack River at Leeper, MO 1967: 237 mmBlack River at Leeper, MO 1968: 318 mmBlack River at Leeper, MO 1969: 300 mmBlack River at Leeper, MO 1970: 273 mmBlack River at Leeper, MO 1971: 204 mmBlack River at Leeper, MO 1972: 325 mmBlack River at Leeper, MO 1973: 615 mmBlack River at Leeper, MO 1974: 509 mmBlack River at Leeper, MO 1975: 405 mmBlack River at Leeper, MO 1976: 197 mmBlack River at Leeper, MO 1977: 347 mmBlack River at Leeper, MO 1978: 219 mmBlack River at Leeper, MO 1979: 475 mmBlack River at Leeper, MO 1980: 164 mmBlack River at Leeper, MO 1981: 224 mmBlack River at Leeper, MO 1982: 452 mmBlack River at Leeper, MO 1983: 564 mmBlack River at Leeper, MO 1984: 401 mmBlack River at Leeper, MO 1985: 778 mmBlack River at Leeper, MO 1986: 350 mmBlack River at Leeper, MO 1987: 240 mmBlack River at Leeper, MO 1988: 316 mmBlack River at Leeper, MO 1989: 294 mmBlack River at Leeper, MO 1990: 427 mmBlack River at Leeper, MO 1991: 396 mmBlack River at Leeper, MO 1992: 287 mmBlack River at Leeper, MO 1993: 457 mmBlack River at Leeper, MO 2009: 491 mmBlack River at Leeper, MO 2010: 273 mmBlack River at Leeper, MO 2011: 506 mmBlack River at Leeper, MO 2012: 209 mmBlack River at Leeper, MO 2013: 491 mmBlack River at Leeper, MO 2014: 292 mmBlack River at Leeper, MO 2015: 458 mmBlack River at Leeper, MO 2016: 492 mmBlack River at Leeper, MO 2017: 517 mmBlack River at Leeper, MO 2018: 372 mmBlack River at Leeper, MO 2019: 566 mmBlack River at Leeper, MO 2020: 549 mmBlack River at Leeper, MO 2021: 438 mmBlack River at Leeper, MO 2022: 441 mmBlack River at Leeper, MO 2023: 434 mmBlack River at Leeper, MO 2024: 407 mmBlack River at Leeper, MO 2025: 427 mm

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.

EventTypePeriodStandingAuthority
Hurricane Katrina water and sanitation collapseFlood2005-08-29 – 2005-09-30Documented 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
PeriodBlack River at Leeper, MO (mm)
1949505
1950574
1951589
1952321
1953188
1954158
1955212
1956177
1957594
1958383
1959277
1960236
1961363
1962280
1963194
1964221
1965222
1966353
1967237
1968318
1969300
1970273
1971204
1972325
1973615
1974509
1975405
1976197
1977347
1978219
1979475
1980164
1981224
1982452
1983564
1984401
1985778
1986350
1987240
1988316
1989294
1990427
1991396
1992287
1993457
2009491
2010273
2011506
2012209
2013491
2014292
2015458
2016492
2017517
2018372
2019566
2020549
2021438
2022441
2023434
2024407
2025427

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 existDerived Computed by Hydrionis
Period held1949–2025
Completeness80.5% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps
  • One period inside 1949–2025 holds no value: 1994 to 2008, 15 years with no reading. It is drawn as a break in the line and is never interpolated across.
ContinuityThe record begins in 1949 and is not continuous from it: 77 years separate the first value from the last, and 81% of the years between them are held. The span is not the record.
Inputs last read2026-10-01 · when the records this was computed from were last read from their publishers
Calculation date2026-08-24 · when the calculation method was last versioned, not a reading of any publisher
RedistributionPermitted by the upstream licences
Commercial reusePermitted by the upstream licences. No Hydrionis access tier can widen this.
MethodologyHow this was produced

Every gauge Hydrionis holds within this area

GaugeMeasuresValuesRecord
Black River at Leeper, MOburned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year2511921–2026
St. Francis River at Fisk, MOcatchment area, annual maximum river flow121998–2026

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 — 11010007. 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.

GaugeEvidenceEstablished
Black River at Leeper, MOStated 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/42026-10-02
St. Francis River at Fisk, MOStated 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/42026-10-02

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.

SignalHeldCounts
Gauges holding a real record1no
Years spanned106yes, 20 or more
Values held263no
Distinct measurements5yes, 2 or more
Publishers measuring it2yes, 2 or more
Official identifiers1recorded, not counted

Use this data

Use this data

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 Black gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-black/

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 Black 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 confidence2025-04-05

Source: USGS — National Water Information System, USGS site 07062500, 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.

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