The monitoring network within this area

Hydrionis holds 892 values from 3 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

892

Values held

1925–2026

Record spans

Gauges within the Upper Broad huc8 subbasin

3 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 BROAD RIVER NEAR BOILING SPRINGS, NC

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1926–2025.

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	BROAD RIVER NEAR BOILING SPRINGS, NC (m³/s)
1926	351
1927	214
1928	2,076
1929	694
1931	164
1932	286
1934	309
1935	405
1936	736
1937	665
1939	326
1940	1,710
1942	379
1943	498
1944	334
1945	915
1946	643
1947	566
1948	306
1949	575
1950	447
1952	498
1953	300
1954	583
1955	203
1956	278
1957	479
1958	399
1960	484
1961	464
1963	538
1964	331
1966	521
1967	626
1968	371
1969	388
1970	623
1972	566
1973	640
1974	504
1975	900
1976	1,036
1977	631
1979	484
1981	135
1982	447
1983	385
1984	547
1985	385
1987	782
1988	146
1989	501
1990	530
1992	354
1993	467
1994	535
1995	949
1996	620
1998	527
1999	121
2000	368
2001	174
2002	77.0
2003	997
2004	1,048
2005	711
2007	396
2008	171
2009	266
2010	657
2012	226
2013	779
2015	170
2017	195
2018	583
2020	1,119
2021	824
2023	368
2024	1,730
2025	394

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	1926–2025
Completeness	80.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	20 separate periods inside 1926–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1926 and is not continuous from it: 100 years separate the first value from the last, and 80% 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 BROAD RIVER NEAR BOILING SPRINGS, NC, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1926–2025.

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	BROAD RIVER NEAR BOILING SPRINGS, NC (mm)
1926	366
1927	361
1928	748
1929	843
1930	402
1931	417
1932	628
1933	503
1934	557
1935	549
1936	860
1937	759
1938	448
1939	483
1940	457
1941	370
1942	536
1943	549
1944	576
1945	555
1946	665
1947	534
1948	663
1949	856
1950	625
1951	459
1952	540
1953	422
1954	372
1955	326
1956	322
1957	629
1958	662
1959	661
1960	762
1961	689
1962	662
1963	491
1964	795
1965	654
1966	528
1967	562
1968	528
1969	647
1970	492
1971	648
1972	691
1973	914
1974	789
1975	966
1976	738
1977	593
1978	610
1979	894
1980	701
1981	333
1982	528
1983	742
1984	712
1985	460
1986	426
1987	580
1988	265
1989	521
1990	718
1991	602
1992	696
1993	703
1994	573
1995	796
1996	646
1997	562
1998	665
1999	331
2000	294
2001	243
2002	294
2003	816
2004	654
2005	649
2006	402
2007	343
2008	227
2009	494
2010	562
2011	361
2012	332
2013	813
2014	500
2015	530
2016	489
2017	416
2018	926
2019	854
2020	993
2021	653
2022	461
2023	459
2024	676
2025	418

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	1926–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1926 to 2025 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 Upper Broad and what each holds
Gauge	Measures	Values	Record
BROAD RIVER NEAR BOILING SPRINGS, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	336	1925–2026
PACOLET RIVER NEAR FINGERVILLE, SC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	305	1930–2026
SECOND BROAD RIVER AT CLIFFSIDE, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	251	1925–2026

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 — 03050105. 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
BROAD RIVER NEAR BOILING SPRINGS, NC	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
PACOLET RIVER NEAR FINGERVILLE, SC	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
SECOND BROAD RIVER AT CLIFFSIDE, NC	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 4 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	102	yes, 20 or more
Values held	892	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-02151500.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 Broad gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-broad/

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 Broad 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 confidence2025-08-11

Source: USGS — National Water Information System, USGS site 02151500, 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.