HydrionisGlobal Water Intelligence
HUC8 subbasin

Maine Coastal

2 monitoring stations within this area in United States, holding 295 values between 1906 and 2026. A United States federal hydrologic unit at the eight-digit subbasin level — a drainage area, not a river. Many subbasins take the name of the largest river within them, and the gauges below are anywhere inside the area, including on tributaries.

United StatesHUC8 subbasin

The monitoring network within this area

Hydrionis holds 295 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.

2
Gauges
295
Values held
1906–2026
Record spans
Gauges within the Maine Coastal huc8 subbasin
2 monitoring points, positioned as the publisher records them.
Gauges within the Maine Coastal huc8 subbasinMachias River at Whitneyville, Maine, WEST BRANCH UNION RIVER AT AMHERST, MEMachias River at Whitneyville, MaineWEST BRANCH UNION RIVER AT AMHERST, ME

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 Machias River at Whitneyville, Maine
The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1906–2008.
Shading marks when something was recorded, not what caused the line.
Largest measured flow of each year at Machias River at Whitneyville, MaineLargest measured flow of each year at Machias River at Whitneyville, Maine: Machias River at Whitneyville, Maine in m³/s, from 1906 to 2008.Hurricane Katrina water and sanitation collapse0200400m³/s19061915193119401950195919692002Machias River at Whitneyville, Maine 1906: 158 m³/sMachias River at Whitneyville, Maine 1907: 144 m³/sMachias River at Whitneyville, Maine 1908: 117 m³/sMachias River at Whitneyville, Maine 1909: 326 m³/sMachias River at Whitneyville, Maine 1909: 151 m³/sMachias River at Whitneyville, Maine 1911: 136 m³/sMachias River at Whitneyville, Maine 1912: 162 m³/sMachias River at Whitneyville, Maine 1912: 184 m³/sMachias River at Whitneyville, Maine 1914: 164 m³/sMachias River at Whitneyville, Maine 1915: 199 m³/sMachias River at Whitneyville, Maine 1916: 125 m³/sMachias River at Whitneyville, Maine 1917: 198 m³/sMachias River at Whitneyville, Maine 1918: 170 m³/sMachias River at Whitneyville, Maine 1919: 164 m³/sMachias River at Whitneyville, Maine 1920: 264 m³/sMachias River at Whitneyville, Maine 1920: 130 m³/sMachias River at Whitneyville, Maine 1930: 157 m³/sMachias River at Whitneyville, Maine 1931: 133 m³/sMachias River at Whitneyville, Maine 1932: 173 m³/sMachias River at Whitneyville, Maine 1932: 176 m³/sMachias River at Whitneyville, Maine 1934: 198 m³/sMachias River at Whitneyville, Maine 1935: 141 m³/sMachias River at Whitneyville, Maine 1936: 283 m³/sMachias River at Whitneyville, Maine 1936: 124 m³/sMachias River at Whitneyville, Maine 1937: 127 m³/sMachias River at Whitneyville, Maine 1939: 161 m³/sMachias River at Whitneyville, Maine 1940: 267 m³/sMachias River at Whitneyville, Maine 1940: 97.1 m³/sMachias River at Whitneyville, Maine 1942: 168 m³/sMachias River at Whitneyville, Maine 1943: 194 m³/sMachias River at Whitneyville, Maine 1943: 142 m³/sMachias River at Whitneyville, Maine 1945: 150 m³/sMachias River at Whitneyville, Maine 1945: 134 m³/sMachias River at Whitneyville, Maine 1947: 227 m³/sMachias River at Whitneyville, Maine 1948: 200 m³/sMachias River at Whitneyville, Maine 1949: 134 m³/sMachias River at Whitneyville, Maine 1950: 216 m³/sMachias River at Whitneyville, Maine 1950: 334 m³/sMachias River at Whitneyville, Maine 1951: 144 m³/sMachias River at Whitneyville, Maine 1953: 232 m³/sMachias River at Whitneyville, Maine 1954: 328 m³/sMachias River at Whitneyville, Maine 1954: 131 m³/sMachias River at Whitneyville, Maine 1956: 143 m³/sMachias River at Whitneyville, Maine 1957: 75.9 m³/sMachias River at Whitneyville, Maine 1958: 134 m³/sMachias River at Whitneyville, Maine 1959: 184 m³/sMachias River at Whitneyville, Maine 1959: 198 m³/sMachias River at Whitneyville, Maine 1961: 419 m³/sMachias River at Whitneyville, Maine 1962: 200 m³/sMachias River at Whitneyville, Maine 1963: 231 m³/sMachias River at Whitneyville, Maine 1964: 174 m³/sMachias River at Whitneyville, Maine 1964: 140 m³/sMachias River at Whitneyville, Maine 1966: 90.6 m³/sMachias River at Whitneyville, Maine 1966: 197 m³/sMachias River at Whitneyville, Maine 1968: 109 m³/sMachias River at Whitneyville, Maine 1969: 153 m³/sMachias River at Whitneyville, Maine 1969: 245 m³/sMachias River at Whitneyville, Maine 1971: 125 m³/sMachias River at Whitneyville, Maine 1972: 196 m³/sMachias River at Whitneyville, Maine 1973: 326 m³/sMachias River at Whitneyville, Maine 1973: 153 m³/sMachias River at Whitneyville, Maine 1975: 96.8 m³/sMachias River at Whitneyville, Maine 1976: 351 m³/sMachias River at Whitneyville, Maine 1977: 206 m³/sMachias River at Whitneyville, Maine 2002: 143 m³/sMachias River at Whitneyville, Maine 2003: 197 m³/sMachias River at Whitneyville, Maine 2003: 142 m³/sMachias River at Whitneyville, Maine 2005: 189 m³/sMachias River at Whitneyville, Maine 2005: 236 m³/sMachias River at Whitneyville, Maine 2007: 248 m³/sMachias River at Whitneyville, Maine 2008: 174 m³/s

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.

EventTypePeriodStandingAuthority
Hurricane Katrina water and sanitation collapseFlood2005-08-29 – 2005-09-30Documented 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
PeriodMachias River at Whitneyville, Maine (m³/s)
1906158
1907144
1908117
1909326
1911136
1912162
1914164
1915199
1916125
1917198
1918170
1919164
1920264
1930157
1931133
1932173
1934198
1935141
1936283
1937127
1939161
1940267
1942168
1943194
1945150
1947227
1948200
1949134
1950216
1951144
1953232
1954328
1956143
195775.9
1958134
1959184
1961419
1962200
1963231
1964174
196690.6
1968109
1969153
1971125
1972196
1973326
197596.8
1976351
1977206
2002143
2003197
2005189
2007248
2008174

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 existMeasured
Period held1906–2008
Completeness52.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps
  • 18 separate periods inside 1906–2008 hold no value. The longest runs from 1978 to 2001 — 24 years with no reading. They are drawn as breaks in the line and are never interpolated across.
ContinuityThe record begins in 1906 and is not continuous from it: 103 years separate the first value from the last, and 52% of the years between them are held. The span is not the record.
Last read from the publisher2026-08-31
RedistributionPermitted by the upstream licences
Commercial reusePermitted by the upstream licences. No Hydrionis access tier can widen this.
MethodologyHow 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 Machias River at Whitneyville, 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. 1906–2008.
Shading marks when something was recorded, not what caused the line.
Water leaving the catchment above Machias River at Whitneyville, Maine, as a depthWater leaving the catchment above Machias River at Whitneyville, Maine, as a depth: Machias River at Whitneyville, Maine in mm, from 1906 to 2008.Hurricane Katrina water and sanitation collapse2505007501,000mm19061916193419431952196119702004Machias River at Whitneyville, Maine 1906: 778 mmMachias River at Whitneyville, Maine 1907: 762 mmMachias River at Whitneyville, Maine 1908: 691 mmMachias River at Whitneyville, Maine 1910: 599 mmMachias River at Whitneyville, Maine 1911: 488 mmMachias River at Whitneyville, Maine 1912: 806 mmMachias River at Whitneyville, Maine 1913: 808 mmMachias River at Whitneyville, Maine 1914: 669 mmMachias River at Whitneyville, Maine 1915: 606 mmMachias River at Whitneyville, Maine 1916: 717 mmMachias River at Whitneyville, Maine 1917: 1,060 mmMachias River at Whitneyville, Maine 1918: 897 mmMachias River at Whitneyville, Maine 1919: 829 mmMachias River at Whitneyville, Maine 1920: 974 mmMachias River at Whitneyville, Maine 1930: 607 mmMachias River at Whitneyville, Maine 1931: 588 mmMachias River at Whitneyville, Maine 1932: 638 mmMachias River at Whitneyville, Maine 1933: 632 mmMachias River at Whitneyville, Maine 1934: 803 mmMachias River at Whitneyville, Maine 1935: 621 mmMachias River at Whitneyville, Maine 1936: 845 mmMachias River at Whitneyville, Maine 1937: 655 mmMachias River at Whitneyville, Maine 1938: 763 mmMachias River at Whitneyville, Maine 1939: 577 mmMachias River at Whitneyville, Maine 1940: 670 mmMachias River at Whitneyville, Maine 1941: 379 mmMachias River at Whitneyville, Maine 1942: 693 mmMachias River at Whitneyville, Maine 1943: 790 mmMachias River at Whitneyville, Maine 1944: 558 mmMachias River at Whitneyville, Maine 1945: 766 mmMachias River at Whitneyville, Maine 1946: 543 mmMachias River at Whitneyville, Maine 1947: 678 mmMachias River at Whitneyville, Maine 1948: 473 mmMachias River at Whitneyville, Maine 1949: 547 mmMachias River at Whitneyville, Maine 1950: 786 mmMachias River at Whitneyville, Maine 1951: 933 mmMachias River at Whitneyville, Maine 1952: 708 mmMachias River at Whitneyville, Maine 1953: 843 mmMachias River at Whitneyville, Maine 1954: 1,104 mmMachias River at Whitneyville, Maine 1955: 621 mmMachias River at Whitneyville, Maine 1956: 549 mmMachias River at Whitneyville, Maine 1957: 438 mmMachias River at Whitneyville, Maine 1958: 796 mmMachias River at Whitneyville, Maine 1959: 866 mmMachias River at Whitneyville, Maine 1960: 710 mmMachias River at Whitneyville, Maine 1961: 706 mmMachias River at Whitneyville, Maine 1962: 630 mmMachias River at Whitneyville, Maine 1963: 851 mmMachias River at Whitneyville, Maine 1964: 506 mmMachias River at Whitneyville, Maine 1965: 441 mmMachias River at Whitneyville, Maine 1966: 451 mmMachias River at Whitneyville, Maine 1967: 597 mmMachias River at Whitneyville, Maine 1968: 567 mmMachias River at Whitneyville, Maine 1969: 767 mmMachias River at Whitneyville, Maine 1970: 623 mmMachias River at Whitneyville, Maine 1971: 598 mmMachias River at Whitneyville, Maine 1972: 912 mmMachias River at Whitneyville, Maine 1973: 1,141 mmMachias River at Whitneyville, Maine 1974: 718 mmMachias River at Whitneyville, Maine 1975: 631 mmMachias River at Whitneyville, Maine 1976: 947 mmMachias River at Whitneyville, Maine 2002: 620 mmMachias River at Whitneyville, Maine 2003: 844 mmMachias River at Whitneyville, Maine 2004: 521 mmMachias River at Whitneyville, Maine 2005: 1,153 mmMachias River at Whitneyville, Maine 2006: 862 mmMachias River at Whitneyville, Maine 2007: 701 mmMachias River at Whitneyville, Maine 2008: 1,095 mm

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.

EventTypePeriodStandingAuthority
Hurricane Katrina water and sanitation collapseFlood2005-08-29 – 2005-09-30Documented 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
PeriodMachias River at Whitneyville, Maine (mm)
1906778
1907762
1908691
1910599
1911488
1912806
1913808
1914669
1915606
1916717
19171,060
1918897
1919829
1920974
1930607
1931588
1932638
1933632
1934803
1935621
1936845
1937655
1938763
1939577
1940670
1941379
1942693
1943790
1944558
1945766
1946543
1947678
1948473
1949547
1950786
1951933
1952708
1953843
19541,104
1955621
1956549
1957438
1958796
1959866
1960710
1961706
1962630
1963851
1964506
1965441
1966451
1967597
1968567
1969767
1970623
1971598
1972912
19731,141
1974718
1975631
1976947
2002620
2003844
2004521
20051,153
2006862
2007701
20081,095

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 existDerived Computed by Hydrionis
Period held1906–2008
Completeness66.0% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps
  • 3 separate periods inside 1906–2008 hold no value. The longest runs from 1977 to 2001 — 25 years with no reading. They are drawn as breaks in the line and are never interpolated across.
ContinuityThe record begins in 1906 and is not continuous from it: 103 years separate the first value from the last, and 66% of the years between them are held. The span is not the record.
Last read from the publisher2026-08-24
RedistributionPermitted by the upstream licences
Commercial reusePermitted by the upstream licences. No Hydrionis access tier can widen this.
MethodologyHow this was produced

Every gauge Hydrionis holds within this area

GaugeMeasuresValuesRecord
Machias River at Whitneyville, Maineburned area within 50 km, catchment area, annual maximum river flow, mean river flow1761906–2026
WEST BRANCH UNION RIVER AT AMHERST, MEcatchment area, annual maximum river flow, mean river flow1191909–2026

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 — 01050002. 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.

GaugeEvidenceEstablished
Machias River at Whitneyville, MaineStated 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/42026-08-26
WEST BRANCH UNION RIVER AT AMHERST, MEStated 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/42026-08-26

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 3 of them, which makes it a full profile.

SignalHeldCounts
Gauges holding a real record2no
Years spanned121yes, 20 or more
Values held295no
Distinct measurements4yes, 2 or more
Publishers measuring it2yes, 2 or more
Official identifiers1recorded, not counted

Use this data

Use this data

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), Maine Coastal gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-maine-coastal/

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 Maine Coastal 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 confidence2008-03-10

Source: USGS — National Water Information System, USGS site 01021500, 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 31 August 2026.

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