The monitoring network within this area

Hydrionis holds 887 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

887

Values held

1912–2026

Record spans

Gauges within the Waits River-Connecticut River 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 CONNECTICUT RIVER AT WEST LEBANON, NH

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1912–2025.

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	CONNECTICUT RIVER AT WEST LEBANON, NH (m³/s)
1912	1,977
1913	3,200
1914	1,948
1915	1,257
1916	1,184
1917	1,133
1918	1,371
1919	1,676
1920	1,371
1921	1,147
1922	2,534
1923	1,869
1924	1,184
1925	1,948
1926	1,651
1927	977
1929	1,116
1930	937
1931	852
1932	1,470
1933	1,945
1934	1,620
1935	940
1936	3,398
1937	1,458
1938	2,333
1939	1,495
1940	1,688
1941	906
1942	1,119
1943	1,059
1944	1,042
1945	1,215
1947	1,795
1948	1,073
1950	1,220
1951	1,184
1952	1,600
1953	2,076
1954	1,436
1955	1,427
1956	1,158
1957	651
1958	1,625
1959	1,045
1960	1,614
1961	1,045
1962	1,277
1963	1,116
1964	1,237
1965	617
1966	835
1967	1,274
1968	1,322
1969	1,756
1970	1,334
1971	1,283
1972	1,756
1973	2,240
1975	1,189
1976	1,994
1979	1,388
1980	900
1981	1,348
1982	1,614
1983	1,291
1984	1,872
1985	631
1986	1,430
1987	1,937
1988	1,186
1989	1,328
1990	1,252
1992	1,311
1993	1,212
1994	1,659
1995	807
1996	1,424
1998	1,696
1999	900
2000	1,342
2001	1,674
2002	1,841
2003	1,158
2005	1,461
2006	1,254
2007	1,099
2008	1,385
2009	1,096
2010	1,254
2011	2,973
2012	793
2013	1,051
2014	1,705
2015	1,133
2016	1,297
2017	1,546
2018	1,045
2019	1,849
2020	1,042
2021	915
2022	694
2023	1,948
2025	1,093

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	1912–2025
Completeness	91.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	9 separate periods inside 1912–2025 hold no value. The longest runs from 1977 to 1978 — 2 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1912 and is not continuous from it: 114 years separate the first value from the last, and 91% 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 CONNECTICUT RIVER AT WEST LEBANON, NH, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1913–2025.

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	CONNECTICUT RIVER AT WEST LEBANON, NH (mm)
1913	667
1919	622
1922	669
1923	614
1924	627
1925	715
1926	628
1927	699
1928	683
1929	590
1930	502
1931	460
1932	590
1933	542
1934	545
1935	544
1936	738
1937	680
1938	650
1939	580
1940	572
1941	393
1942	541
1943	676
1944	516
1945	816
1946	607
1947	668
1948	492
1949	465
1950	565
1951	599
1952	595
1953	577
1954	842
1955	564
1956	549
1957	485
1958	619
1959	629
1960	578
1961	480
1962	559
1963	496
1964	462
1965	395
1966	510
1967	517
1968	519
1969	720
1970	552
1971	506
1972	657
1973	921
1974	754
1975	612
1979	616
1980	440
1981	733
1982	581
1983	755
1984	662
1985	513
1986	610
1987	539
1988	464
1989	590
1990	847
1991	598
1992	519
1993	533
1994	583
1995	493
1996	892
1997	607
1998	709
1999	537
2000	664
2001	437
2002	602
2003	672
2004	561
2005	823
2006	864
2007	661
2008	907
2009	769
2010	719
2011	861
2012	541
2013	656
2014	659
2015	595
2016	532
2017	714
2018	644
2019	777
2020	548
2021	452
2022	556
2023	848
2024	724
2025	552

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	1913–2025
Completeness	91.2% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	3 separate periods inside 1913–2025 hold no value. The longest runs from 1914 to 1918 — 5 years with no reading. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1913 and is not continuous from it: 113 years separate the first value from the last, and 91% 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 Waits River-Connecticut River and what each holds
Gauge	Measures	Values	Record
SUGAR RIVER AT WEST CLAREMONT, NH	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	328	1928–2026
CONNECTICUT RIVER AT WEST LEBANON, NH	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	319	1912–2026
MASCOMA RIVER AT MASCOMA, NH	catchment area, annual maximum river flow, mean river flow, mean river flow, water year	240	1923–2026

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 — 01080104. 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
SUGAR RIVER AT WEST CLAREMONT, NH	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
CONNECTICUT RIVER AT WEST LEBANON, NH	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
MASCOMA RIVER AT MASCOMA, NH	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	115	yes, 20 or more
Values held	887	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-01152500.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), Waits River-Connecticut River gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-waits-river-connecticut-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 Waits River-Connecticut 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 confidence2025-05-10

Source: USGS — National Water Information System, USGS site 01152500, 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.