The monitoring network within this area

Hydrionis holds 392 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

392

Values held

1889–2026

Record spans

Gauges within the Upper Black Warrior 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 BLACK WARRIOR RIVER AT NORTHPORT AL

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1889–2025.

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	BLACK WARRIOR RIVER AT NORTHPORT AL (m³/s)
1889	0
1890	0
1891	0
1892	0
1893	0
1894	0
1895	0
1896	0
1897	0
1898	0
1899	0
1900	6,088
1901	0
1902	0
1903	0
1905	0
1906	0
1907	0
1908	0
1909	0
1910	0
1911	0
1912	0
1913	0
1914	0
1915	0
1916	0
1917	0
1918	0
1920	0
1921	0
1922	0
1923	0
1924	0
1925	0
1926	0
1928	0
1929	3,738
1930	1,572
1932	2,209
1934	2,823
1935	3,002
1936	4,191
1937	3,030
1938	4,078
1939	3,426
1940	3,171
1941	1,583
1942	2,486
1944	4,248
1945	2,648
1946	4,786
1947	4,134
1948	3,426
1949	5,012
1950	4,304
1951	6,315
1953	3,398
1954	3,596
1955	3,200
1956	2,775
1957	2,350
1959	1,977
1960	2,336
1961	6,343
1963	1,625
1964	3,285
1965	2,342
1966	2,438
1967	1,240
1968	2,724
1969	3,200
1970	5,805
1971	2,486
1972	3,030
1973	2,772
1975	2,713
1976	2,973
1977	4,559
1979	7,702
1980	4,219
1981	2,795
1982	2,410
1983	4,786
1985	1,858
1987	2,815
1988	1,161
1989	2,679
1990	5,380
1991	2,945
1992	1,399
1993	3,653
1994	2,973
1995	2,101
1996	5,097
1997	1,846
1998	4,502
1999	3,285
2000	5,267
2001	3,511
2003	3,370
2004	5,493
2006	2,027
2008	1,283
2009	5,748
2010	3,087
2011	6,683
2012	1,824
2013	3,710
2014	4,927
2015	3,115
2017	2,144
2018	1,951
2020	4,814
2021	3,766
2022	3,738
2023	2,217
2024	1,965
2025	2,670

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	1889–2025
Completeness	86.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	18 separate periods inside 1889–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1889 and is not continuous from it: 137 years separate the first value from the last, and 87% 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 BLACK WARRIOR RIVER AT NORTHPORT AL, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1895–2025.

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	BLACK WARRIOR RIVER AT NORTHPORT AL (mm)
1895	570
1896	342
1897	524
1898	302
1899	653
1901	602
1902	653
1929	1,012
1930	453
1931	301
1932	923
1933	400
1934	431
1935	483
1936	538
1937	609
1938	497
1939	601
1940	582
1941	317
1942	400
1943	358
1944	525
1945	519
1946	836
1947	587
1948	724
1949	749
1950	605
1951	732
1952	333
1953	501
1954	317
1955	434
1956	510
1957	630
1958	435
1959	511
1960	463
1961	709
1962	615
1963	373
1964	803
1965	491
1966	449
1967	533
1968	505
1969	508
1970	519
1971	620
1972	465
1973	894
1974	704
1975	817
1976	640
1977	758
1978	399
1979	901
1980	882
1981	313
1982	692
1983	986
1984	566
1985	426
1986	251
1987	450
1988	323
1989	830
1990	717
1991	727
1992	433
1993	482
1994	722
1995	568
1996	652
1997	722
1998	653
1999	475
2000	435
2001	758
2002	630
2003	717
2004	700
2005	509
2006	441
2007	166
2008	303
2009	996
2010	481
2011	644
2012	456
2013	769
2014	557
2016	415
2017	470
2020	955
2021	797
2022	675
2023	457
2024	403
2025	532

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	1895–2025
Completeness	77.1% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	4 separate periods inside 1895–2025 hold no value. The longest runs from 1903 to 1928 — 26 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1895 and is not continuous from it: 131 years separate the first value from the last, and 77% 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 Upper Black Warrior and what each holds
Gauge	Measures	Values	Record
BLACK WARRIOR RIVER AT NORTHPORT AL	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	375	1889–2026
BLACK WARRIOR R AT BANKHEAD L&D NEAR BESSEMER AL	catchment area, annual maximum river flow	17	1929–2026

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 — 03160112. 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
BLACK WARRIOR RIVER AT NORTHPORT AL	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
BLACK WARRIOR R AT BANKHEAD L&D NEAR BESSEMER AL	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	1	no
Years spanned	138	yes, 20 or more
Values held	392	no
Distinct measurements	5	yes, 2 or more
Publishers measuring it	2	yes, 2 or more
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-02465000.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 Black Warrior gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-black-warrior/

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 Warrior 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 confidence2025-04-07

Source: USGS — National Water Information System, USGS site 02465000, 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.