HydrionisGlobal Water Intelligence
HUC8 subbasin

Greys-Hoback

3 monitoring stations within this area in United States, holding 1,791 values between 1918 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 1,791 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.

3
Gauges
1,791
Values held
1918–2026
Record spans
Gauges within the Greys-Hoback huc8 subbasin
3 monitoring points, positioned as the publisher records them.
Gauges within the Greys-Hoback huc8 subbasinGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY, FLAT CREEK NEAR CHENEY, WY, HOBACK RIVER NEAR JACKSON, WYGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WYFLAT CREEK NEAR CHENEY, WYHOBACK RIVER NEAR JACKSON, WY

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 GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY
The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1918–2024.
Shading marks when something was recorded, not what caused the line.
Largest measured flow of each year at GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WYLargest measured flow of each year at GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY: GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY in m³/s, from 1918 to 2024.Hurricane Katrina water and sanitation collapse0100200m³/s19181960196919781987199720072016GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1918: 147 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1937: 58.6 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1938: 89.5 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1954: 119 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1955: 56.9 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1956: 142 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1957: 121 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1958: 105 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1959: 82.7 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1960: 70.8 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1961: 59.7 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1962: 88.1 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1963: 68.5 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1964: 121 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1965: 109 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1966: 89.2 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1967: 115 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1968: 92.3 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1969: 75.6 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1970: 120 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1971: 205 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1972: 146 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1973: 72.2 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1974: 148 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1975: 103 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1976: 102 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1977: 18.4 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1978: 112 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1979: 78.2 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1980: 83.8 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1981: 58.9 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1982: 112 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1983: 134 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1984: 129 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1985: 77.6 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1986: 172 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1987: 47.3 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1988: 66.3 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1989: 73.3 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1990: 49.8 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1991: 87.2 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1992: 35.1 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1993: 97.7 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1994: 88.3 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1995: 86.6 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1997: 145 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1998: 70.8 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2000: 81.0 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2001: 76.5 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2002: 65.7 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2003: 85.0 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2004: 59.7 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2005: 73.6 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2006: 96.3 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2007: 53.5 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2008: 102 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2009: 104 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2010: 122 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2011: 118 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2012: 54.7 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2013: 66.3 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2014: 127 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2015: 78.2 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2016: 79.0 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2017: 135 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2018: 122 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2019: 87.8 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2020: 114 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2021: 62.6 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2022: 85.5 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2023: 112 m³/sGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2024: 93.4 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
PeriodGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY (m³/s)
1918147
193758.6
193889.5
1954119
195556.9
1956142
1957121
1958105
195982.7
196070.8
196159.7
196288.1
196368.5
1964121
1965109
196689.2
1967115
196892.3
196975.6
1970120
1971205
1972146
197372.2
1974148
1975103
1976102
197718.4
1978112
197978.2
198083.8
198158.9
1982112
1983134
1984129
198577.6
1986172
198747.3
198866.3
198973.3
199049.8
199187.2
199235.1
199397.7
199488.3
199586.6
1997145
199870.8
200081.0
200176.5
200265.7
200385.0
200459.7
200573.6
200696.3
200753.5
2008102
2009104
2010122
2011118
201254.7
201366.3
2014127
201578.2
201679.0
2017135
2018122
201987.8
2020114
202162.6
202285.5
2023112
202493.4

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 existMeasured
Period held1918–2024
Completeness67.3% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps
  • 4 separate periods inside 1918–2024 hold no value. The longest runs from 1919 to 1936 — 18 years with no reading. They are drawn as breaks in the line and are never interpolated across.
ContinuityThe record begins in 1918 and is not continuous from it: 107 years separate the first value from the last, and 67% of the years between them are held. The span is not the record.
Last read from the publisher2026-10-01
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 GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY, as a depth
The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1938–2024.
Shading marks when something was recorded, not what caused the line.
Water leaving the catchment above GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY, as a depthWater leaving the catchment above GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY, as a depth: GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY in mm, from 1938 to 2024.Hurricane Katrina water and sanitation collapse02505007501,000mm19381962197119801989199820072016GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1938: 504 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1954: 480 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1955: 358 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1956: 666 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1957: 559 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1958: 468 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1959: 429 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1960: 379 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1961: 321 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1962: 558 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1963: 419 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1964: 508 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1965: 646 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1966: 370 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1967: 531 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1968: 482 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1969: 424 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1970: 547 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1971: 783 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1972: 711 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1973: 417 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1974: 696 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1975: 557 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1976: 605 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1977: 178 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1978: 589 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1979: 415 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1980: 516 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1981: 329 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1982: 660 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1983: 663 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1984: 622 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1985: 428 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1986: 775 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1987: 317 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1988: 376 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1989: 477 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1990: 340 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1991: 408 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1992: 258 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1993: 524 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1994: 348 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1995: 518 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1996: 637 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1997: 768 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1998: 542 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 1999: 584 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2000: 441 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2001: 280 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2002: 338 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2003: 377 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2004: 376 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2005: 447 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2006: 524 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2007: 337 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2008: 485 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2009: 563 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2010: 432 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2011: 783 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2012: 409 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2013: 338 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2014: 586 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2015: 512 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2016: 482 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2017: 802 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2018: 630 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2019: 470 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2020: 507 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2021: 339 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2022: 367 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2023: 499 mmGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY 2024: 434 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
PeriodGREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY (mm)
1938504
1954480
1955358
1956666
1957559
1958468
1959429
1960379
1961321
1962558
1963419
1964508
1965646
1966370
1967531
1968482
1969424
1970547
1971783
1972711
1973417
1974696
1975557
1976605
1977178
1978589
1979415
1980516
1981329
1982660
1983663
1984622
1985428
1986775
1987317
1988376
1989477
1990340
1991408
1992258
1993524
1994348
1995518
1996637
1997768
1998542
1999584
2000441
2001280
2002338
2003377
2004376
2005447
2006524
2007337
2008485
2009563
2010432
2011783
2012409
2013338
2014586
2015512
2016482
2017802
2018630
2019470
2020507
2021339
2022367
2023499
2024434

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 held1938–2024
Completeness82.8% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps
  • One period inside 1938–2024 holds no value: 1939 to 1953, 15 years with no reading. It is drawn as a break in the line and is never interpolated across.
ContinuityThe record begins in 1938 and is not continuous from it: 87 years separate the first value from the last, and 83% of the years between them are held. The span is not the record.
Inputs last read2026-10-01 · when the records this was computed from were last read from their publishers
Calculation date2026-08-24 · when the calculation method was last versioned, not a reading of any publisher
RedistributionPermitted by the upstream licences
Commercial reusePermitted by the upstream licences. No Hydrionis access tier can widen this.
MethodologyHow this was produced

The snow standing above this water

3 automated snow stations sit inside this drainage area, weighing the snowpack rather than measuring how deep it is.

1,242
Fullest snowpack recorded at Phillips Bench, in 1982 (mm of water)
418
Thinnest, in 1981 (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 Phillips Bench
Water years 1981–2026. Each point is the fullest month of that snow season.
Peak snowpack at Phillips BenchPeak snowpack at Phillips Bench: Phillips Bench in mm, from 1981 to 2026.05001,000mm19811987199319992005201120172023Phillips Bench 1981: 418 mmPhillips Bench 1982: 1,242 mmPhillips Bench 1983: 1,006 mmPhillips Bench 1984: 689 mmPhillips Bench 1985: 648 mmPhillips Bench 1986: 999 mmPhillips Bench 1987: 422 mmPhillips Bench 1988: 589 mmPhillips Bench 1989: 931 mmPhillips Bench 1990: 557 mmPhillips Bench 1991: 637 mmPhillips Bench 1992: 453 mmPhillips Bench 1993: 777 mmPhillips Bench 1994: 520 mmPhillips Bench 1995: 779 mmPhillips Bench 1996: 898 mmPhillips Bench 1997: 1,105 mmPhillips Bench 1998: 695 mmPhillips Bench 1999: 874 mmPhillips Bench 2000: 581 mmPhillips Bench 2001: 459 mmPhillips Bench 2002: 576 mmPhillips Bench 2003: 617 mmPhillips Bench 2004: 600 mmPhillips Bench 2005: 564 mmPhillips Bench 2006: 890 mmPhillips Bench 2007: 455 mmPhillips Bench 2008: 909 mmPhillips Bench 2009: 752 mmPhillips Bench 2010: 454 mmPhillips Bench 2011: 1,028 mmPhillips Bench 2012: 579 mmPhillips Bench 2013: 593 mmPhillips Bench 2014: 895 mmPhillips Bench 2015: 526 mmPhillips Bench 2016: 534 mmPhillips Bench 2017: 985 mmPhillips Bench 2018: 795 mmPhillips Bench 2019: 761 mmPhillips Bench 2020: 792 mmPhillips Bench 2021: 554 mmPhillips Bench 2022: 507 mmPhillips Bench 2023: 773 mmPhillips Bench 2024: 611 mmPhillips Bench 2025: 641 mmPhillips Bench 2026: 486 mm

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
PeriodPhillips Bench (mm)
1981418
19821,242
19831,006
1984689
1985648
1986999
1987422
1988589
1989931
1990557
1991637
1992453
1993777
1994520
1995779
1996898
19971,105
1998695
1999874
2000581
2001459
2002576
2003617
2004600
2005564
2006890
2007455
2008909
2009752
2010454
20111,028
2012579
2013593
2014895
2015526
2016534
2017985
2018795
2019761
2020792
2021554
2022507
2023773
2024611
2025641
2026486

Read against the river

Phillips Bench and GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WY both sit in this drainage area, and their records overlap by 44 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

GaugeMeasuresValuesRecord
GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WYburned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year2541918–2026
HOBACK RIVER NEAR JACKSON, WYcatchment area, annual maximum river flow181918–2026
FLAT CREEK NEAR CHENEY, WYcatchment area, annual maximum river flow71918–2026

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 — 17040103. 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
GREYS RIVER ABOVE RESERVOIR, NEAR ALPINE, WYStated 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/42026-10-02
HOBACK RIVER NEAR JACKSON, WYStated 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/42026-10-02
FLAT CREEK NEAR CHENEY, WYStated 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/42026-10-02

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.

SignalHeldCounts
Gauges holding a real record1no
Years spanned109yes, 20 or more
Values held1,791yes, 1000 or more
Distinct measurements6yes, 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), Greys-Hoback gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-greys-hoback/

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 Greys-Hoback 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 confidence2024-06-06

Source: USGS — National Water Information System, USGS site 13023000, 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.

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