The monitoring network within this area

Hydrionis holds 2,257 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

2,257

Values held

1878–2026

Record spans

Gauges within the Upper New 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 NEW RIVER AT RADFORD, VA

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1878–2025.

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	NEW RIVER AT RADFORD, VA (m³/s)
1878	6,145
1896	1,484
1897	1,903
1898	1,053
1899	1,433
1900	963
1901	4,163
1903	1,846
1904	518
1905	2,260
1906	1,705
1907	1,994
1908	1,178
1909	1,308
1910	878
1911	620
1912	864
1913	1,308
1914	396
1916	5,663
1917	906
1918	1,090
1920	555
1921	685
1923	779
1924	1,206
1926	1,048
1928	1,577
1929	793
1931	555
1932	569
1934	685
1936	1,090
1937	906
1939	433
1940	6,173
1942	886
1944	909
1945	1,775
1946	1,257
1947	977
1948	977
1949	1,155
1950	1,761
1952	796
1953	988
1954	1,359
1955	909
1956	943
1957	1,540
1958	558
1959	2,010
1961	1,371
1963	1,320
1964	680
1965	1,014
1966	1,577
1967	663
1968	643
1970	889
1971	447
1972	2,282
1973	2,246
1974	1,161
1975	1,359
1976	1,405
1977	1,699
1979	1,526
1980	1,169
1981	728
1982	1,136
1983	1,351
1984	1,104
1985	541
1987	1,532
1989	2,622
1991	691
1992	2,098
1993	2,008
1994	1,679
1995	3,058
1996	2,263
1998	1,229
1999	354
2000	385
2001	646
2002	920
2003	1,526
2005	813
2006	988
2007	620
2009	654
2010	1,133
2011	1,433
2013	2,529
2014	648
2015	1,662
2016	949
2017	1,750
2018	1,682
2020	2,648
2022	855
2023	770
2024	4,729
2025	858

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	1878–2025
Completeness	70.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	27 separate periods inside 1878–2025 hold no value. The longest runs from 1879 to 1895 — 17 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1878 and is not continuous from it: 148 years separate the first value from the last, and 71% 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 SOUTH FORK NEW RIVER NEAR JEFFERSON, 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. 1925–2025.

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	SOUTH FORK NEW RIVER NEAR JEFFERSON, NC (mm)
1925	430
1929	990
1930	459
1931	511
1932	730
1933	722
1934	676
1935	842
1936	742
1937	744
1938	617
1939	549
1940	932
1941	531
1942	726
1943	631
1944	599
1945	841
1946	704
1947	676
1948	758
1949	1,112
1950	806
1951	593
1952	543
1953	584
1954	448
1955	534
1956	479
1957	988
1958	779
1959	715
1960	820
1961	782
1962	692
1963	496
1964	678
1965	618
1966	736
1967	670
1968	651
1969	801
1970	715
1971	790
1972	791
1973	1,020
1974	970
1975	950
1976	819
1977	1,022
1978	671
1979	1,222
1980	739
1981	496
1982	666
1983	1,028
1984	700
1985	571
1986	474
1987	761
1988	365
1989	889
1990	855
1991	768
1992	948
1993	768
1994	814
1995	860
1996	903
1997	642
1998	880
1999	476
2000	426
2001	388
2002	452
2003	971
2004	865
2005	751
2006	646
2007	480
2008	448
2009	798
2010	717
2011	730
2012	601
2013	1,270
2014	595
2015	866
2016	658
2017	819
2018	1,418
2019	1,145
2020	1,430
2021	731
2022	705
2023	675
2024	998
2025	662

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	1925–2025
Completeness	97.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1925–2025 holds no value: 1926 to 1928, 3 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1925 and is not continuous from it: 101 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 Upper New and what each holds
Gauge	Measures	Values	Record
NEW RIVER AT RADFORD, VA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	340	1878–2026
SOUTH FORK NEW RIVER NEAR JEFFERSON, NC	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	332	1916–2026
LITTLE RIVER AT GRAYSONTOWN, VA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	328	1928–2026
NEW RIVER AT ALLISONIA, VA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	325	1929–2026
NEW RIVER NEAR GALAX, VA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	322	1929–2026
NEW RIVER AT IVANHOE, VA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	274	1916–2026
BIG REED ISLAND CREEK NEAR ALLISONIA, VA	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	228	1908–2026
REED CREEK AT GRAHAMS FORGE, VA	catchment area, annual maximum river flow	108	1909–2026

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 — 05050001. 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
NEW RIVER AT RADFORD, VA	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
SOUTH FORK NEW RIVER NEAR JEFFERSON, 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
LITTLE RIVER AT GRAYSONTOWN, VA	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
NEW RIVER AT ALLISONIA, VA	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
NEW RIVER NEAR GALAX, VA	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
NEW RIVER AT IVANHOE, VA	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
BIG REED ISLAND CREEK NEAR ALLISONIA, VA	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
REED CREEK AT GRAHAMS FORGE, VA	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	149	yes, 20 or more
Values held	2,257	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-03171000.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 New gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-new/

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 New 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 confidence2025-02-16

Source: USGS — National Water Information System, USGS site 03171000, 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.