The monitoring network within this area

Hydrionis holds 460 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

460

Values held

1904–2026

Record spans

Gauges within the Nolichucky 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 NOLICHUCKY RIVER AT EMBREEVILLE, TN

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1921–2022.

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	NOLICHUCKY RIVER AT EMBREEVILLE, TN (m³/s)
1921	733
1922	459
1923	447
1924	337
1926	317
1928	1,000
1929	391
1931	326
1932	323
1934	991
1935	1,036
1936	813
1938	314
1939	326
1940	2,336
1941	267
1942	357
1944	368
1945	382
1946	816
1947	603
1949	1,045
1950	597
1952	337
1953	617
1954	816
1955	411
1956	600
1957	1,076
1959	796
1960	399
1961	487
1963	1,356
1964	487
1965	1,169
1966	1,158
1968	527
1970	462
1972	1,085
1973	920
1974	830
1975	745
1976	680
1977	1,011
1979	617
1981	320
1982	629
1983	776
1984	824
1985	283
1987	620
1989	821
1990	824
1991	855
1992	782
1993	530
1994	1,167
1995	1,812
1996	968
1998	1,455
1999	215
2001	473
2002	425
2003	487
2004	1,815
2005	439
2006	368
2007	265
2008	538
2009	442
2010	544
2011	459
2013	1,053
2014	784
2015	739
2017	408
2018	968
2019	1,167
2020	932
2021	1,144
2022	513

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	1921–2022
Completeness	79.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	21 separate periods inside 1921–2022 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1921 and is not continuous from it: 102 years separate the first value from the last, and 79% 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 NOLICHUCKY RIVER AT EMBREEVILLE, TN, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1921–2023.

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	NOLICHUCKY RIVER AT EMBREEVILLE, TN (mm)
1921	645
1922	621
1923	630
1924	606
1925	322
1926	452
1927	600
1928	781
1929	830
1930	376
1931	451
1932	617
1933	546
1934	520
1935	671
1936	740
1937	594
1938	530
1939	446
1940	560
1941	317
1942	496
1943	499
1944	494
1945	622
1946	591
1947	553
1948	576
1949	780
1950	674
1951	509
1952	437
1953	422
1954	454
1955	460
1956	483
1957	821
1958	593
1959	619
1960	614
1961	654
1962	680
1963	515
1964	640
1965	536
1966	547
1967	585
1968	508
1969	507
1970	462
1971	632
1972	695
1973	724
1974	829
1975	735
1976	593
1977	802
1978	608
1979	971
1980	543
1981	394
1982	559
1983	779
1984	590
1985	472
1986	341
1987	527
1988	282
1989	720
1990	777
1991	639
1992	764
1993	610
1994	774
1995	764
1996	696
1997	554
1998	735
1999	431
2000	433
2001	399
2002	445
2003	763
2004	757
2005	661
2006	587
2007	331
2008	341
2009	660
2010	532
2011	602
2012	601
2013	1,093
2014	538
2015	644
2016	450
2017	603
2018	1,092
2019	873
2020	1,082
2021	656
2022	586
2023	609

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	1921–2023
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1921 to 2023 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 Nolichucky and what each holds
Gauge	Measures	Values	Record
NOLICHUCKY RIVER AT EMBREEVILLE, TN	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	346	1920–2026
NOLICHUCKY RIVER NEAR MORRISTOWN, TN	catchment area, annual maximum river flow	61	1921–2026
NOLICHUCKY RIVER BELOW NOLICHUCKY DAM, TN	catchment area, annual maximum river flow	53	1904–2026

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 — 06010108. 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
NOLICHUCKY RIVER AT EMBREEVILLE, 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
NOLICHUCKY RIVER NEAR MORRISTOWN, 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
NOLICHUCKY RIVER BELOW NOLICHUCKY DAM, 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

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	123	yes, 20 or more
Values held	460	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-03465500.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), Nolichucky gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-nolichucky/

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 Nolichucky 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 confidence2022-11-11

Source: USGS — National Water Information System, USGS site 03465500, 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.