The monitoring network within this area

Hydrionis holds 1,456 values from 5 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

1,456

Values held

1891–2026

Record spans

Gauges within the Lower Kennebec River huc8 subbasin

5 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 Cobbosseecontee Stream at Gardiner, Maine

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1891–2025.

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	Cobbosseecontee Stream at Gardiner, Maine (m³/s)
1891	80.1
1892	9.51
1893	83.3
1894	28.9
1895	81.6
1896	83.8
1897	28.3
1898	39.1
1899	44.5
1900	75.0
1901	99.4
1903	102
1904	85.5
1905	27.4
1906	39.6
1907	52.7
1908	56.6
1909	62.3
1910	27.4
1911	23.8
1912	49.3
1913	51.8
1914	49.0
1915	29.7
1916	65.7
1917	120
1918	35.7
1919	81.8
1920	111
1922	132
1923	94.9
1924	71.4
1925	62.9
1926	66.5
1927	53.5
1928	79.6
1929	92.0
1930	75.3
1931	61.4
1932	90.0
1933	77.6
1934	83.8
1935	67.7
1936	142
1937	64.6
1938	58.9
1939	79.9
1940	80.4
1941	9.00
1942	37.9
1943	58.9
1944	55.2
1945	66.5
1946	37.4
1947	54.9
1948	90.6
1949	37.4
1950	56.9
1951	86.1
1952	76.7
1953	82.7
1954	79.0
1956	74.8
1957	8.55
1958	68.5
1959	55.5
1960	90.0
1961	74.2
1962	46.4
1964	70.8
1977	101
1978	53.5
1979	62.3
1980	50.4
1981	27.5
1982	46.4
1983	99.4
1984	101
1985	51.0
1986	61.4
1987	120
1988	52.1
1989	81.8
1990	53.8
1991	64.0
1992	63.1
1993	77.6
1994	53.0
1995	31.4
1996	62.3
1997	55.2
1998	79.0
1999	49.3
2000	55.8
2001	60.6
2002	37.1
2003	35.4
2005	110
2006	65.4
2007	80.7
2008	49.6
2009	59.5
2010	69.9
2011	64.0
2012	76.2
2013	35.1
2014	47.3
2015	47.9
2017	51.3
2018	39.1
2019	42.2
2020	54.9
2022	34.3
2023	58.9
2024	60.0
2025	35.4

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	1891–2025
Completeness	85.9% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	8 separate periods inside 1891–2025 hold no value. The longest runs from 1965 to 1976 — 12 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1891 and is not continuous from it: 135 years separate the first value from the last, and 86% 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 Cobbosseecontee Stream at Gardiner, 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. 1906–2025.

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	Cobbosseecontee Stream at Gardiner, Maine (mm)
1906	518
1907	475
1908	510
1909	476
1910	372
1911	295
1912	475
1913	456
1914	538
1915	355
1916	573
1917	754
1918	440
1919	523
1920	956
1921	481
1922	576
1923	530
1924	472
1925	370
1926	499
1927	502
1928	629
1929	608
1930	457
1931	440
1932	418
1933	528
1934	508
1935	572
1936	743
1937	654
1938	548
1939	502
1940	582
1941	262
1942	432
1943	505
1944	545
1945	704
1946	476
1947	508
1948	400
1949	447
1950	426
1951	843
1952	715
1953	729
1954	878
1955	479
1956	593
1957	337
1958	788
1959	607
1960	851
1961	618
1962	598
1963	681
1977	873
1978	554
1979	775
1980	396
1981	531
1982	461
1983	1,010
1984	896
1985	307
1986	602
1987	549
1988	329
1989	558
1990	711
1991	663
1992	494
1993	534
1994	559
1995	502
1996	881
1997	491
1998	717
1999	633
2000	610
2001	399
2002	451
2003	551
2004	436
2005	1,052
2006	875
2007	629
2008	956
2009	915
2010	793
2011	746
2012	580
2013	657
2014	716
2015	533
2016	488
2017	561
2018	617
2019	767
2020	641
2021	510
2022	648
2023	940
2024	728
2025	413

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	1906–2025
Completeness	89.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	One period inside 1906–2025 holds no value: 1964 to 1976, 13 years with no reading. It is drawn as a break in the line and is never interpolated across.
Continuity	The record begins in 1906 and is not continuous from it: 120 years separate the first value from the last, and 89% 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 Lower Kennebec River and what each holds
Gauge	Measures	Values	Record
Cobbosseecontee Stream at Gardiner, Maine	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	339	1891–2026
Carrabassett River near North Anson, Maine	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	308	1902–2026
Kennebec River at Bingham, Maine	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	289	1907–2026
Sandy River near Mercer, Maine	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	266	1929–2026
Sebasticook River near Pittsfield, Maine	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	254	1929–2026

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 — 01030003. 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
Cobbosseecontee Stream at Gardiner, 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
Carrabassett River near North Anson, 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 Bingham, 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
Sandy River near Mercer, 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
Sebasticook River near Pittsfield, 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

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	5	yes, 3 or more
Years spanned	136	yes, 20 or more
Values held	1,456	yes, 1000 or more
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-01049500.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), Lower Kennebec River gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-lower-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 Lower 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 confidence2025-05-11

Source: USGS — National Water Information System, USGS site 01049500, 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.