The monitoring network within this area

Hydrionis holds 7,095 values from 9 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.

9

Gauges

7,095

Values held

1899–2026

Record spans

Gauges within the Colorado Headwaters huc8 subbasin

9 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 FRASER RIVER AT WINTER PARK, CO.

The highest instantaneous discharge the publisher recorded in each year — a flood peak as measured, not a daily average of one. 1911–2025.

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	FRASER RIVER AT WINTER PARK, CO. (m³/s)
1911	8.61
1913	8.44
1914	14.6
1915	17.2
1916	7.36
1917	9.80
1918	23.2
1919	4.76
1920	9.12
1921	14.9
1922	9.51
1923	12.5
1924	12.5
1925	7.19
1926	10.8
1927	6.65
1928	9.91
1929	9.12
1930	9.37
1931	5.72
1932	5.44
1933	10.6
1934	4.87
1935	10.6
1936	7.90
1937	4.25
1938	4.30
1939	4.73
1940	0.991
1942	9.23
1943	4.45
1944	6.48
1945	3.74
1947	7.87
1948	8.35
1949	10.2
1950	1.30
1951	9.00
1952	13.3
1953	6.71
1955	1.02
1956	4.22
1957	15.1
1958	8.86
1959	5.04
1960	7.14
1961	4.13
1962	4.81
1963	0.680
1964	0.793
1965	7.87
1967	4.53
1968	2.75
1969	8.61
1970	7.62
1971	10.9
1972	6.26
1973	14.4
1974	7.53
1975	4.59
1976	0.991
1977	1.16
1978	3.85
1979	7.50
1980	8.83
1981	2.27
1982	4.81
1983	17.7
1984	11.9
1985	5.55
1986	8.52
1987	6.12
1988	7.67
1989	1.39
1990	1.87
1991	6.85
1992	5.49
1993	6.54
1994	4.22
1995	14.4
1996	8.35
1997	12.3
1998	5.83
1999	5.83
2000	3.20
2001	2.97
2002	0.510
2003	8.33
2004	0.765
2005	6.20
2006	4.45
2007	7.31
2008	4.59
2009	6.91
2010	10.1
2011	9.32
2012	1.70
2013	4.56
2014	9.94
2015	8.61
2016	8.58
2017	6.80
2018	4.11
2019	7.70
2020	6.29
2021	3.79
2022	6.46
2023	8.24
2024	10.4
2025	5.89

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	1911–2025
Completeness	95.7% of the periods in that span are held. Gaps are drawn as breaks and never interpolated.
Known gaps	5 separate periods inside 1911–2025 hold no value. They are drawn as breaks in the line and are never interpolated across.
Continuity	The record begins in 1911 and is not continuous from it: 115 years separate the first value from the last, and 96% 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 FRASER RIVER AT WINTER PARK, 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. 1911–2024.

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	FRASER RIVER AT WINTER PARK, CO. (mm)
1911	558
1912	684
1913	452
1914	741
1915	700
1916	531
1917	531
1918	772
1919	391
1920	529
1921	677
1922	431
1923	576
1924	515
1925	507
1926	661
1927	568
1928	675
1929	617
1930	548
1931	361
1932	433
1933	578
1934	346
1935	463
1936	370
1937	216
1938	192
1939	151
1940	122
1941	126
1942	418
1943	120
1944	215
1945	125
1946	119
1947	377
1948	254
1949	381
1950	117
1951	201
1952	258
1953	106
1954	69.0
1955	91.0
1956	125
1957	570
1958	342
1959	145
1960	222
1961	164
1962	237
1963	79.0
1964	81.0
1965	254
1966	87.0
1967	161
1968	100
1969	326
1970	329
1971	396
1972	174
1973	362
1974	229
1975	192
1976	108
1977	87.0
1978	147
1979	226
1980	273
1981	87.0
1982	135
1983	547
1984	587
1985	150
1986	214
1987	186
1988	157
1989	100
1990	106
1991	184
1992	195
1993	341
1994	191
1995	562
1996	401
1997	392
1998	329
1999	309
2000	175
2001	155
2002	80.0
2003	196
2004	96.0
2005	205
2006	135
2007	326
2008	154
2009	314
2010	326
2011	458
2012	116
2013	195
2014	386
2015	392
2016	321
2017	221
2018	204
2019	206
2020	218
2021	150
2022	215
2023	415
2024	338

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	1911–2024
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1911 to 2024 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

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

841

Fullest snowpack recorded at Berthoud Summit, in 2011 (mm of water)

262

Thinnest, in 2002 (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 Berthoud Summit

Water years 1979–2026. 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	Berthoud Summit (mm)
1979	507
1980	641
1981	315
1982	565
1983	772
1984	717
1985	509
1986	603
1987	422
1988	530
1989	503
1990	373
1991	523
1992	548
1993	686
1994	484
1995	538
1996	701
1997	679
1998	550
1999	492
2000	458
2001	523
2002	262
2003	562
2004	360
2005	439
2006	568
2007	493
2008	589
2009	566
2010	520
2011	841
2012	309
2013	476
2014	650
2015	452
2016	550
2017	443
2018	443
2019	547
2020	592
2021	470
2022	400
2023	494
2024	573
2025	536
2026	263

Read against the river

Berthoud Summit and WILLIAMS FORK NEAR PARSHALL, CO both sit in this drainage area, and their records overlap by 46 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 Colorado Headwaters and what each holds
Gauge	Measures	Values	Record
FRASER RIVER AT WINTER PARK, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	379	1910–2026
WILLIAMS FORK NEAR PARSHALL, CO	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	368	1904–2026
COLORADO RIVER NEAR KREMMLING, CO	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	237	1905–2026
COLORADO RIVER AT GLENWOOD SPRINGS, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	236	1899–2026
COLORADO RIVER NEAR GRAND LAKE, CO.	burned area within 50 km, catchment area, annual maximum river flow, mean river flow, mean river flow, water year	228	1904–2026
COLORADO RIVER NEAR GRANBY, CO	catchment area, annual maximum river flow	89	1908–2026
COLORADO RIVER AT HOT SULPHUR SPRINGS, CO.	catchment area, annual maximum river flow	87	1905–2026
TROUBLESOME CREEK NEAR TROUBLESOME, CO.	catchment area, annual maximum river flow	29	1905–2026
FRASER RIVER AT GRANBY, CO.	catchment area, annual maximum river flow	24	1905–2026

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 — 14010001. 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
FRASER RIVER AT WINTER PARK, 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/4	2026-10-02
WILLIAMS FORK NEAR PARSHALL, 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/4	2026-10-02
COLORADO RIVER NEAR KREMMLING, 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/4	2026-10-02
COLORADO RIVER AT GLENWOOD SPRINGS, 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/4	2026-10-02
COLORADO RIVER NEAR GRAND LAKE, 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/4	2026-10-02
COLORADO RIVER NEAR GRANBY, 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/4	2026-10-02
COLORADO RIVER AT HOT SULPHUR SPRINGS, 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/4	2026-10-02
TROUBLESOME CREEK NEAR TROUBLESOME, 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/4	2026-10-02
FRASER RIVER AT GRANBY, 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/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 5 of them, which makes it a full profile.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	7	yes, 3 or more
Years spanned	128	yes, 20 or more
Values held	7,095	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-09024000.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), Colorado Headwaters gauge records, accessed 2026-10-05, hydrionis.com/waters/united-states-colorado-headwaters/

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 Colorado Headwaters 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 confidence2025-06-11

Source: USGS — National Water Information System, USGS site 09024000, 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.