HydrionisGlobal Water Intelligence
HUC8 subbasin

Upper San Juan

2 monitoring stations within this area in United States, holding 1,809 values between 1927 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 1,809 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
1,809
Values held
1927–2026
Record spans
Gauges within the Upper San Juan huc8 subbasin
2 monitoring points, positioned as the publisher records them.
Gauges within the Upper San Juan huc8 subbasinLOS PINOS RIVER NEAR BAYFIELD, CO., NAVAJO RIVER AT EDITH, CO.LOS PINOS RIVER NEAR BAYFIELD, CO.NAVAJO RIVER AT EDITH, CO.

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 NAVAJO RIVER AT EDITH, CO.
The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1935–1995.
Largest measured flow of each year at NAVAJO RIVER AT EDITH, CO.Largest measured flow of each year at NAVAJO RIVER AT EDITH, CO.: NAVAJO RIVER AT EDITH, CO. in m³/s, from 1935 to 1995.0255075100m³/s19351943195119591967197619841992NAVAJO RIVER AT EDITH, CO. 1935: 38.5 m³/sNAVAJO RIVER AT EDITH, CO. 1936: 33.4 m³/sNAVAJO RIVER AT EDITH, CO. 1937: 67.1 m³/sNAVAJO RIVER AT EDITH, CO. 1938: 39.9 m³/sNAVAJO RIVER AT EDITH, CO. 1939: 22.3 m³/sNAVAJO RIVER AT EDITH, CO. 1940: 18.0 m³/sNAVAJO RIVER AT EDITH, CO. 1941: 67.4 m³/sNAVAJO RIVER AT EDITH, CO. 1942: 80.4 m³/sNAVAJO RIVER AT EDITH, CO. 1943: 20.2 m³/sNAVAJO RIVER AT EDITH, CO. 1944: 27.1 m³/sNAVAJO RIVER AT EDITH, CO. 1945: 32.6 m³/sNAVAJO RIVER AT EDITH, CO. 1946: 16.6 m³/sNAVAJO RIVER AT EDITH, CO. 1947: 21.1 m³/sNAVAJO RIVER AT EDITH, CO. 1948: 24.1 m³/sNAVAJO RIVER AT EDITH, CO. 1949: 36.0 m³/sNAVAJO RIVER AT EDITH, CO. 1950: 11.3 m³/sNAVAJO RIVER AT EDITH, CO. 1951: 19.5 m³/sNAVAJO RIVER AT EDITH, CO. 1952: 37.9 m³/sNAVAJO RIVER AT EDITH, CO. 1953: 18.1 m³/sNAVAJO RIVER AT EDITH, CO. 1954: 12.0 m³/sNAVAJO RIVER AT EDITH, CO. 1955: 14.3 m³/sNAVAJO RIVER AT EDITH, CO. 1956: 17.7 m³/sNAVAJO RIVER AT EDITH, CO. 1957: 37.4 m³/sNAVAJO RIVER AT EDITH, CO. 1958: 32.8 m³/sNAVAJO RIVER AT EDITH, CO. 1959: 9.91 m³/sNAVAJO RIVER AT EDITH, CO. 1960: 27.0 m³/sNAVAJO RIVER AT EDITH, CO. 1961: 16.4 m³/sNAVAJO RIVER AT EDITH, CO. 1962: 26.1 m³/sNAVAJO RIVER AT EDITH, CO. 1963: 13.4 m³/sNAVAJO RIVER AT EDITH, CO. 1964: 21.2 m³/sNAVAJO RIVER AT EDITH, CO. 1965: 28.6 m³/sNAVAJO RIVER AT EDITH, CO. 1966: 20.3 m³/sNAVAJO RIVER AT EDITH, CO. 1967: 16.0 m³/sNAVAJO RIVER AT EDITH, CO. 1968: 22.8 m³/sNAVAJO RIVER AT EDITH, CO. 1969: 21.5 m³/sNAVAJO RIVER AT EDITH, CO. 1970: 38.8 m³/sNAVAJO RIVER AT EDITH, CO. 1971: 6.88 m³/sNAVAJO RIVER AT EDITH, CO. 1971: 4.73 m³/sNAVAJO RIVER AT EDITH, CO. 1973: 30.9 m³/sNAVAJO RIVER AT EDITH, CO. 1974: 11.5 m³/sNAVAJO RIVER AT EDITH, CO. 1975: 20.3 m³/sNAVAJO RIVER AT EDITH, CO. 1976: 5.04 m³/sNAVAJO RIVER AT EDITH, CO. 1977: 11.9 m³/sNAVAJO RIVER AT EDITH, CO. 1978: 6.43 m³/sNAVAJO RIVER AT EDITH, CO. 1979: 19.7 m³/sNAVAJO RIVER AT EDITH, CO. 1980: 25.5 m³/sNAVAJO RIVER AT EDITH, CO. 1981: 4.64 m³/sNAVAJO RIVER AT EDITH, CO. 1982: 21.9 m³/sNAVAJO RIVER AT EDITH, CO. 1983: 26.6 m³/sNAVAJO RIVER AT EDITH, CO. 1984: 37.9 m³/sNAVAJO RIVER AT EDITH, CO. 1985: 40.8 m³/sNAVAJO RIVER AT EDITH, CO. 1986: 24.8 m³/sNAVAJO RIVER AT EDITH, CO. 1987: 15.4 m³/sNAVAJO RIVER AT EDITH, CO. 1988: 9.74 m³/sNAVAJO RIVER AT EDITH, CO. 1989: 11.2 m³/sNAVAJO RIVER AT EDITH, CO. 1990: 15.7 m³/sNAVAJO RIVER AT EDITH, CO. 1991: 15.9 m³/sNAVAJO RIVER AT EDITH, CO. 1992: 44.5 m³/sNAVAJO RIVER AT EDITH, CO. 1993: 51.0 m³/sNAVAJO RIVER AT EDITH, CO. 1994: 41.3 m³/sNAVAJO RIVER AT EDITH, CO. 1995: 42.2 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 (0 events)

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
PeriodNAVAJO RIVER AT EDITH, CO. (m³/s)
193538.5
193633.4
193767.1
193839.9
193922.3
194018.0
194167.4
194280.4
194320.2
194427.1
194532.6
194616.6
194721.1
194824.1
194936.0
195011.3
195119.5
195237.9
195318.1
195412.0
195514.3
195617.7
195737.4
195832.8
19599.91
196027.0
196116.4
196226.1
196313.4
196421.2
196528.6
196620.3
196716.0
196822.8
196921.5
197038.8
19716.88
197330.9
197411.5
197520.3
19765.04
197711.9
19786.43
197919.7
198025.5
19814.64
198221.9
198326.6
198437.9
198540.8
198624.8
198715.4
19889.74
198911.2
199015.7
199115.9
199244.5
199351.0
199441.3
199542.2

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 held1935–1995
Completeness98.4% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps
  • One period inside 1935–1995 holds no value: 1972. It is drawn as a break in the line and is never interpolated across.
ContinuityThe record begins in 1935 and is not continuous from it: 61 years separate the first value from the last, and 98% 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 LOS PINOS RIVER NEAR BAYFIELD, CO., as a depth
The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1928–1985.
Water leaving the catchment above LOS PINOS RIVER NEAR BAYFIELD, CO., as a depthWater leaving the catchment above LOS PINOS RIVER NEAR BAYFIELD, CO., as a depth: LOS PINOS RIVER NEAR BAYFIELD, CO. in mm, from 1928 to 1985.2004006008001,000mm19281936194419521960196819761984LOS PINOS RIVER NEAR BAYFIELD, CO. 1928: 369 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1929: 668 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1930: 378 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1931: 323 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1932: 631 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1933: 352 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1934: 206 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1935: 574 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1936: 453 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1937: 489 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1938: 657 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1939: 331 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1940: 300 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1941: 801 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1942: 510 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1943: 419 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1944: 653 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1945: 332 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1946: 282 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1947: 438 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1948: 666 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1949: 652 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1950: 334 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1951: 254 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1952: 586 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1953: 301 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1954: 324 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1955: 348 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1956: 331 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1957: 668 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1958: 558 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1959: 276 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1960: 408 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1961: 359 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1962: 468 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1963: 323 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1964: 281 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1965: 599 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1966: 453 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1967: 347 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1968: 406 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1969: 534 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1970: 463 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1971: 388 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1972: 369 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1973: 678 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1974: 347 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1975: 587 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1976: 416 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1977: 222 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1978: 350 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1979: 748 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1980: 605 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1981: 386 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1982: 542 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1983: 545 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1984: 604 mmLOS PINOS RIVER NEAR BAYFIELD, CO. 1985: 721 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 (0 events)

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
PeriodLOS PINOS RIVER NEAR BAYFIELD, CO. (mm)
1928369
1929668
1930378
1931323
1932631
1933352
1934206
1935574
1936453
1937489
1938657
1939331
1940300
1941801
1942510
1943419
1944653
1945332
1946282
1947438
1948666
1949652
1950334
1951254
1952586
1953301
1954324
1955348
1956331
1957668
1958558
1959276
1960408
1961359
1962468
1963323
1964281
1965599
1966453
1967347
1968406
1969534
1970463
1971388
1972369
1973678
1974347
1975587
1976416
1977222
1978350
1979748
1980605
1981386
1982542
1983545
1984604
1985721

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 held1928–1985
Completeness100.0% of the periods in that span are held.
ContinuityContinuous: every year from 1928 to 1985 is held.
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.

1,561
Fullest snowpack recorded at Upper San Juan, in 1979 (mm of water)
256
Thinnest, in 2026 (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 Upper San Juan
Water years 1979–2026. Each point is the fullest month of that snow season.
Peak snowpack at Upper San JuanPeak snowpack at Upper San Juan: Upper San Juan in mm, from 1979 to 2026.05001,0001,5002,000mm19791985199119972003200920152021Upper San Juan 1979: 1,561 mmUpper San Juan 1980: 1,234 mmUpper San Juan 1981: 399 mmUpper San Juan 1982: 811 mmUpper San Juan 1983: 1,108 mmUpper San Juan 1984: 909 mmUpper San Juan 1985: 1,204 mmUpper San Juan 1986: 1,005 mmUpper San Juan 1987: 930 mmUpper San Juan 1988: 566 mmUpper San Juan 1989: 992 mmUpper San Juan 1990: 479 mmUpper San Juan 1991: 763 mmUpper San Juan 1992: 786 mmUpper San Juan 1993: 1,180 mmUpper San Juan 1994: 711 mmUpper San Juan 1995: 1,124 mmUpper San Juan 1996: 477 mmUpper San Juan 1997: 1,124 mmUpper San Juan 1998: 791 mmUpper San Juan 1999: 855 mmUpper San Juan 2000: 391 mmUpper San Juan 2001: 924 mmUpper San Juan 2002: 263 mmUpper San Juan 2003: 632 mmUpper San Juan 2004: 868 mmUpper San Juan 2005: 1,302 mmUpper San Juan 2006: 457 mmUpper San Juan 2007: 502 mmUpper San Juan 2008: 1,164 mmUpper San Juan 2009: 671 mmUpper San Juan 2010: 712 mmUpper San Juan 2011: 770 mmUpper San Juan 2012: 532 mmUpper San Juan 2013: 625 mmUpper San Juan 2014: 555 mmUpper San Juan 2015: 437 mmUpper San Juan 2016: 648 mmUpper San Juan 2017: 971 mmUpper San Juan 2018: 361 mmUpper San Juan 2019: 982 mmUpper San Juan 2020: 596 mmUpper San Juan 2021: 678 mmUpper San Juan 2022: 659 mmUpper San Juan 2023: 1,169 mmUpper San Juan 2025: 287 mmUpper San Juan 2026: 256 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
PeriodUpper San Juan (mm)
19791,561
19801,234
1981399
1982811
19831,108
1984909
19851,204
19861,005
1987930
1988566
1989992
1990479
1991763
1992786
19931,180
1994711
19951,124
1996477
19971,124
1998791
1999855
2000391
2001924
2002263
2003632
2004868
20051,302
2006457
2007502
20081,164
2009671
2010712
2011770
2012532
2013625
2014555
2015437
2016648
2017971
2018361
2019982
2020596
2021678
2022659
20231,169
2025287
2026256

Why the snow is not read against the river here

Peak snow water equivalent and Mean river flow, water year overlap for only 6 years at these subjects. A relationship read off a span that short is reading the weather of a few seasons.

Every gauge Hydrionis holds within this area

GaugeMeasuresValuesRecord
LOS PINOS RIVER NEAR BAYFIELD, CO.burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year2111927–2026
NAVAJO RIVER AT EDITH, CO.catchment area, annual maximum river flow621935–2026

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 — 14080101. 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
LOS PINOS RIVER NEAR BAYFIELD, CO.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/42026-10-02
NAVAJO RIVER AT EDITH, CO.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/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 record2no
Years spanned100yes, 20 or more
Values held1,809yes, 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), Upper San Juan gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-upper-san-juan/

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 Upper San Juan 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 confidence1986-06-13

Source: USGS — National Water Information System, USGS site 09353500, 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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