The monitoring network within this area

Hydrionis holds 556 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

556

Values held

1901–2026

Record spans

Gauges within the Upper Kennebec River 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 Kennebec River at The Forks, Maine

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1901–2025.

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	Kennebec River at The Forks, Maine (m³/s)
1901	634
1903	326
1904	326
1905	331
1906	337
1907	331
1909	422
1910	289
1911	244
1912	459
1913	385
1914	493
1915	270
1916	303
1917	671
1918	274
1920	413
1921	267
1922	388
1923	501
1924	258
1925	328
1927	328
1928	422
1929	467
1930	246
1932	271
1933	286
1934	246
1935	246
1936	430
1937	402
1938	408
1939	207
1940	230
1941	139
1942	374
1943	289
1944	139
1945	535
1946	394
1947	530
1948	148
1949	112
1950	146
1952	233
1953	365
1954	504
1956	224
1957	235
1958	368
1959	572
1960	377
1961	552
1963	292
1964	265
1966	306
1967	311
1968	311
1969	609
1971	334
1973	473
1975	278
1976	419
1977	320
1978	300
1979	487
1980	283
1981	612
1983	932
1984	858
1985	289
1986	259
1987	578
1989	416
1991	439
1993	311
1994	309
1996	436
1997	357
1998	439
1999	354
2000	555
2001	303
2002	268
2003	331
2005	564
2007	436
2008	510
2009	309
2010	351
2011	547
2012	532
2013	377
2014	399
2015	297
2016	306
2017	447
2018	544
2019	498
2020	323
2021	264
2022	303
2023	428
2025	391

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	1901–2025
Completeness	84.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	20 separate periods inside 1901–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1901 and is not continuous from it: 125 years separate the first value from the last, and 84% 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 Kennebec River at The Forks, Maine, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1904–2024.

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	Kennebec River at The Forks, Maine (mm)
1904	539
1905	491
1906	518
1907	654
1908	652
1909	536
1910	567
1911	329
1912	579
1913	590
1914	561
1915	391
1916	537
1917	847
1918	569
1919	690
1920	648
1921	529
1922	522
1923	482
1924	483
1925	525
1926	495
1927	523
1928	667
1929	608
1930	523
1931	382
1932	484
1933	551
1934	452
1935	529
1936	670
1937	580
1938	610
1939	512
1940	478
1941	394
1942	448
1943	500
1944	442
1945	650
1946	553
1947	679
1948	369
1949	382
1950	410
1951	666
1952	532
1953	557
1954	858
1955	640
1956	473
1957	389
1958	676
1959	568
1960	619
1961	640
1962	449
1963	692
1964	467
1965	339
1966	479
1967	528
1968	507
1969	749
1970	751
1971	548
1972	518
1973	912
1974	817
1975	528
1976	743
1977	667
1978	711
1979	600
1980	377
1981	580
1982	624
1983	703
1984	771
1985	451
1986	613
1987	495
1988	458
1989	517
1990	694
1991	652
1992	525
1993	564
1994	594
1995	536
1996	960
1997	589
1998	713
1999	568
2000	697
2001	423
2002	378
2003	508
2004	548
2005	885
2006	770
2007	736
2008	902
2009	747
2010	746
2011	884
2012	632
2013	640
2014	621
2015	556
2016	508
2017	700
2018	574
2019	709
2020	508
2021	370
2022	616
2023	866
2024	525

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	1904–2024
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1904 to 2024 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 Kennebec River and what each holds
Gauge	Measures	Values	Record
Kennebec River at The Forks, Maine	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	367	1901–2026
KENNEBEC RIVER AT MOOSEHEAD, ME	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	189	1919–2026

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 — 01030001. 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
Kennebec River at The Forks, Maine	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
KENNEBEC RIVER AT MOOSEHEAD, ME	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 2 of them, which makes it a profile, not indexed.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	126	yes, 20 or more
Values held	556	no
Distinct measurements	4	yes, 2 or more
Publishers measuring it	1	no
Official identifiers	1	recorded, not counted

Use this data

Machine-readable JSON /api/v1/observations/by-subject/gauge-usgs-01042500.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 Kennebec River gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-kennebec-river/

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 Kennebec River 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 confidence2025-06-01

Source: USGS — National Water Information System, USGS site 01042500, 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.