The monitoring network within this area

Hydrionis holds 2,767 values from 8 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

2,767

Values held

1810–2026

Record spans

Gauges within the Upper French Broad huc8 subbasin

8 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 FRENCH BROAD RIVER AT ASHEVILLE, NC

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1810–2025.

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	FRENCH BROAD RIVER AT ASHEVILLE, NC (m³/s)
1810	0
1845	0
1850	0
1852	0
1875	0
1876	0
1879	0
1892	0
1893	0
1896	612
1897	354
1898	394
1899	753
1900	422
1901	830
1902	960
1903	538
1904	391
1905	651
1906	731
1908	470
1909	544
1910	858
1911	422
1912	450
1913	600
1914	306
1916	3,115
1917	391
1918	345
1920	538
1922	281
1923	377
1924	272
1926	292
1928	1,209
1929	428
1931	199
1932	192
1934	326
1935	479
1936	467
1937	360
1939	331
1940	985
1942	592
1944	258
1945	212
1946	453
1947	385
1948	270
1949	569
1950	368
1952	442
1953	416
1954	467
1955	233
1956	294
1957	685
1958	256
1959	348
1960	292
1961	538
1963	498
1964	348
1966	552
1967	498
1968	436
1969	189
1970	201
1972	544
1973	858
1974	402
1975	595
1976	597
1977	541
1979	660
1981	186
1982	430
1983	487
1984	411
1985	217
1987	402
1988	208
1989	254
1990	515
1991	487
1992	311
1993	374
1994	597
1995	790
1996	300
1998	697
1999	157
2000	289
2001	159
2002	159
2003	416
2004	1,220
2005	345
2007	274
2008	230
2009	470
2010	371
2011	276
2013	657
2014	274
2015	569
2017	269
2018	592
2019	739
2020	476
2021	736
2022	194
2024	3,200
2025	294

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	1810–2025
Completeness	53.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	30 separate periods inside 1810–2025 hold no value. The longest runs from 1811 to 1844 — 34 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1810 and is not continuous from it: 216 years separate the first value from the last, and 54% 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 FRENCH BROAD RIVER AT ASHEVILLE, 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. 1896–2025.

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	FRENCH BROAD RIVER AT ASHEVILLE, NC (mm)
1896	561
1897	714
1898	834
1899	1,026
1900	969
1901	1,412
1902	795
1903	991
1904	427
1905	764
1906	1,237
1907	616
1908	882
1909	989
1910	710
1911	587
1912	770
1913	775
1914	698
1915	1,021
1916	1,121
1917	675
1918	882
1919	836
1920	890
1921	781
1922	760
1923	714
1924	750
1925	418
1926	506
1927	537
1928	938
1929	1,045
1930	463
1931	494
1932	816
1933	669
1934	711
1935	686
1936	953
1937	843
1938	567
1939	661
1940	639
1941	460
1942	767
1943	768
1944	613
1945	605
1946	818
1947	616
1948	814
1949	1,123
1950	785
1951	574
1952	685
1953	580
1954	501
1955	503
1956	462
1957	825
1958	701
1959	771
1960	772
1961	893
1962	773
1963	528
1964	1,023
1965	729
1966	692
1967	791
1968	664
1969	840
1970	588
1971	754
1972	795
1973	1,104
1974	925
1975	1,049
1976	850
1977	845
1978	716
1979	1,263
1980	736
1981	370
1982	671
1983	932
1984	840
1985	536
1986	463
1987	643
1988	350
1989	915
1990	927
1991	857
1992	1,003
1993	763
1994	937
1995	1,006
1996	905
1997	838
1998	925
1999	501
2000	458
2001	412
2002	485
2003	996
2004	1,055
2005	931
2006	606
2007	440
2008	382
2009	803
2010	764
2011	636
2012	581
2013	1,254
2014	665
2015	757
2016	619
2017	656
2018	1,285
2019	1,127
2020	1,245
2021	888
2022	721
2023	520
2024	938
2025	612

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	1896–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1896 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 French Broad and what each holds
Gauge	Measures	Values	Record
FRENCH BROAD RIVER AT ASHEVILLE, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	436	1810–2026
FRENCH BROAD RIVER AT BLANTYRE, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	361	1879–2026
FRENCH BROAD RIVER NEAR NEWPORT, TN	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	358	1867–2026
DAVIDSON RIVER NEAR BREVARD, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	343	1916–2026
SWANNANOA RIVER AT BILTMORE, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	332	1876–2026
MILLS RIVER NEAR MILLS RIVER, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	317	1906–2026
FRENCH BROAD RIVER AT ROSMAN, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	311	1907–2026
BEETREE CREEK NEAR SWANNANOA, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	309	1926–2026

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 — 06010105. 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
FRENCH BROAD RIVER AT ASHEVILLE, 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
FRENCH BROAD RIVER AT BLANTYRE, 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
FRENCH BROAD RIVER NEAR NEWPORT, TN	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
DAVIDSON RIVER NEAR BREVARD, 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
SWANNANOA RIVER AT BILTMORE, 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
MILLS RIVER NEAR MILLS RIVER, 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
FRENCH BROAD RIVER AT ROSMAN, 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
BEETREE CREEK NEAR SWANNANOA, 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 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	8	yes, 3 or more
Years spanned	217	yes, 20 or more
Values held	2,767	yes, 1000 or more
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-03451500.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 French Broad gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-french-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 French 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 confidence2025-02-13

Source: USGS — National Water Information System, USGS site 03451500, 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.