The monitoring network within this area

Hydrionis holds 254 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

254

Values held

1894–2026

Record spans

Gauges within the Middle Kern-Upper Tehachapi-Grapevine huc8 subbasin

2 monitoring points, positioned as the publisher records them.

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 KERN R NR BAKERSFIELD CA, as a depth

The year's flow spread over the land draining to this gauge, in millimetres — the same unit rainfall is measured in. 1894–1975.

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
Period	KERN R NR BAKERSFIELD CA (mm)
1894	106
1895	203
1896	123
1897	176
1898	50.0
1899	67.0
1900	66.0
1901	174
1902	109
1903	108
1904	98.0
1905	105
1906	376
1907	212
1908	100
1909	364
1910	130
1911	201
1912	77.0
1913	73.0
1914	220
1915	128
1916	394
1917	163
1918	107
1919	99.0
1920	119
1921	101
1922	170
1923	99.0
1924	37.0
1925	92.0
1926	73.0
1927	157
1928	62.0
1929	64.0
1930	69.0
1931	37.0
1932	146
1933	87.0
1934	45.0
1935	94.0
1936	158
1937	249
1938	269
1939	91.0
1940	156
1941	277
1942	153
1943	242
1944	124
1945	186
1946	129
1947	80.0
1948	65.0
1949	60.0
1950	119
1951	88.0
1952	297
1953	109
1954	101
1955	73.0
1956	150
1957	88.0
1958	191
1959	70.0
1960	64.0
1961	35.0
1962	120
1963	134
1964	72.0
1965	125
1966	100
1967	290
1968	98.0
1969	458
1970	119
1971	88.0
1972	62.0
1973	155
1974	148
1975	113

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	1894–1975
Completeness	100.0% of the periods in that span are held.
Continuity	Continuous: every year from 1894 to 1975 is held.
Last read from the publisher	2026-08-24
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

Every gauge Hydrionis holds within this area

Gauges within the Middle Kern-Upper Tehachapi-Grapevine and what each holds
Gauge	Measures	Values	Record
BOREL CN BL ISABELLA DAM CA	burned area within 50 km, mean river flow	135	1910–2020
KERN R NR BAKERSFIELD CA	burned area within 50 km, catchment area, mean river flow	119	1894–2026

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 — 18030003. 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
BOREL CN BL ISABELLA DAM CA	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	2026-08-26
KERN R NR BAKERSFIELD CA	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	2026-08-26

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.

Information-gain signals held for this water body
Signal	Held	Counts
Gauges holding a real record	2	no
Years spanned	133	yes, 20 or more
Values held	254	no
Distinct measurements	3	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-11187500.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), Middle Kern-Upper Tehachapi-Grapevine gauge records, accessed 2026-09-02, hydrionis.com/waters/united-states-middle-kern-upper-tehachapi-grapevine/

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 Middle Kern-Upper Tehachapi-Grapevine 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

Spatially aggregatedHigh confidence2020

Source: USGS — National Water Information System, USGS site 11187500, parameter 00060, annual mean statistics. Licence: Open.

Method: Annual mean discharge as published by the USGS statistics service, computed by USGS from its own quality-controlled daily record. Hydrionis converts cubic feet per second to cubic metres per second and records the publisher unit alongside; it does not recompute the mean.

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 24 August 2026.