The monitoring network within this area

Hydrionis holds 1,215 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

1,215

Values held

1925–2026

Record spans

Gauges within the Moyie 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 MOYIE RIVER AT EASTPORT ID

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1930–2025.

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	MOYIE RIVER AT EASTPORT ID (m³/s)
1930	94.3
1931	81.3
1932	154
1933	145
1934	177
1935	125
1936	106
1937	93.4
1938	172
1939	106
1940	89.2
1941	72.5
1942	161
1943	168
1944	42.5
1945	124
1946	172
1947	193
1948	227
1949	175
1950	188
1951	183
1952	163
1953	137
1954	266
1955	157
1956	264
1957	176
1958	129
1959	153
1960	173
1961	239
1962	112
1963	125
1964	197
1965	138
1966	187
1967	217
1968	132
1969	192
1970	125
1971	208
1972	209
1973	153
1974	198
1975	163
1976	258
1977	55.2
1978	133
1979	86.9
1980	169
1981	153
1982	174
1983	152
1984	116
1985	124
1986	110
1987	151
1988	94.3
1989	165
1990	146
1991	182
1992	77.0
1993	127
1994	109
1995	127
1996	142
1997	252
1998	203
1999	202
2000	110
2001	71.9
2002	264
2003	113
2004	80.1
2005	75.9
2006	195
2007	167
2008	239
2009	118
2010	141
2011	189
2012	174
2013	186
2014	155
2015	72.5
2016	103
2017	157
2018	225
2019	86.6
2020	157
2021	85.8
2022	188
2023	146
2024	96.0
2025	73.9

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	1930–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1930 to 2025 is held.
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 MOYIE RIVER AT EASTPORT ID, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1930–2025.

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	MOYIE RIVER AT EASTPORT ID (mm)
1930	295
1931	188
1932	438
1933	556
1934	499
1935	375
1936	269
1937	318
1938	490
1939	328
1940	265
1941	325
1942	457
1943	501
1944	146
1945	320
1946	492
1947	549
1948	536
1949	395
1950	635
1951	607
1952	407
1953	417
1954	595
1955	480
1956	586
1957	358
1958	303
1959	578
1960	453
1961	542
1962	363
1963	414
1964	431
1965	452
1966	449
1967	451
1968	402
1969	586
1970	273
1971	525
1972	576
1973	306
1974	687
1975	480
1976	490
1977	161
1978	400
1979	215
1980	348
1981	519
1982	471
1983	467
1984	353
1985	341
1986	365
1987	281
1988	265
1989	403
1990	511
1991	531
1992	209
1993	303
1994	327
1995	449
1996	562
1997	604
1998	380
1999	561
2000	350
2001	152
2002	475
2003	291
2004	298
2005	347
2006	462
2007	453
2008	351
2009	257
2010	305
2011	523
2012	563
2013	400
2014	453
2015	330
2016	437
2017	510
2018	447
2019	221
2020	406
2021	313
2022	410
2023	245
2024	283
2025	301

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	Derived Computed by Hydrionis
Period held	1930–2025
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1930 to 2025 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

The snow standing above this water

1 automated snow station sits inside this drainage area, weighing the snowpack rather than measuring how deep it is.

1,332

Fullest snowpack recorded at Hawkins Lake, in 1974 (mm of water)

371

Thinnest, in 1977 (mm of water)

April

Month the pack is usually at its fullest

June

Month the pack has gone by, in half of years

Peak snowpack at Hawkins Lake

Water years 1969–2026. Each point is the fullest month of that snow season.

A water year runs October to September and is named for the year it ends, so the snow of one winter stays in one point. The value is the fullest month, not the fullest day: a pack that peaked sharply mid-month reads lower here than a single measurement taken at the right moment would.

View the data behind this chart

Underlying data
Period	Hawkins Lake (mm)
1969	911
1970	612
1971	1,108
1972	1,156
1973	663
1974	1,332
1975	887
1976	987
1977	371
1978	642
1979	564
1980	804
1981	644
1982	926
1983	778
1984	544
1985	579
1986	729
1987	573
1988	635
1989	665
1990	713
1991	1,053
1992	459
1993	435
1994	499
1995	643
1996	734
1997	952
1998	449
1999	1,051
2000	516
2001	403
2002	813
2003	617
2004	517
2005	404
2006	739
2007	767
2008	783
2009	660
2010	522
2011	1,082
2012	1,023
2013	748
2014	740
2015	546
2016	696
2017	811
2018	830
2019	511
2020	673
2021	550
2022	634
2023	588
2024	519
2025	585
2026	582

Read against the river

Hawkins Lake and MOYIE RIVER AT EASTPORT ID both sit in this drainage area, and their records overlap by 56 years. That is the span the two have in common, not a count of years both actually hold — either record may have gaps inside it. The two are shown separately rather than on one axis: millimetres of stored water and cubic metres per second are not commensurable, and a difference between them would mean nothing.

Being in the same drainage area does not put the snowpack upstream of the gauge. A subbasin is an area, and snow on one tributary can join the river below a gauge on another — so a weak relationship here may say more about which tributary was measured than about the snow.

Every gauge Hydrionis holds within this area

Gauges within the Moyie and what each holds
Gauge	Measures	Values	Record
MOYIE RIVER AT EASTPORT ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	325	1929–2026
MOYIE RIVER AT EILEEN ID	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	194	1925–2026

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 — 17010105. 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
MOYIE RIVER AT EASTPORT ID	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
MOYIE RIVER AT EILEEN ID	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	2	no
Years spanned	102	yes, 20 or more
Values held	1,215	yes, 1000 or more
Distinct measurements	6	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-12306500.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), Moyie gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-moyie/

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 Moyie 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 confidence2025-05-12

Source: USGS — National Water Information System, USGS site 12306500, 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.