HUC8 subbasin
Santa Ana
20 monitoring stations within this area in United States, holding 1,660 values between 1899 and 2025. 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.
The monitoring network within this area
Hydrionis holds 1,660 values from 20 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.
20
Gauges
1,660
Values held
1899–2025
Record spans
Gauges within the Santa Ana huc8 subbasin
20 monitoring points, positioned as the publisher records them.
Every gauge Hydrionis holds within this area
| Gauge | Measures | Values | Record |
|---|---|---|---|
| SANTA ANA R NR MENTONE CA | mean river flow | 123 | 1899–2024 |
| LYTLE+BRLNE+COND+INF - W27 CA | mean river flow | 116 | 1905–2024 |
| SANTA ANA R NR MENTONE CN + CN CA | mean river flow | 110 | 1913–2023 |
| PLUNGE C NR EAST HIGHLANDS CA | mean river flow | 106 | 1920–2025 |
| DEVIL CYN C NR SAN BERNARDINO CA | mean river flow | 106 | 1920–2025 |
| CITY C NR HIGHLAND CA | mean river flow | 105 | 1920–2024 |
| LYTLE C NR FONTANA CA | mean river flow | 104 | 1919–2025 |
| E TWIN C NR ARROWHEAD SPRINGS CA | mean river flow | 103 | 1921–2025 |
| CITY C NR HIGHLAND CA.+ CANALS CA | mean river flow | 98 | 1925–2024 |
| WATERMAN CANYON CREEK NR ARROWHEAD SPRINGS CA | mean river flow | 84 | 1912–2024 |
| SANTA ANA R A SANTA ANA CA | mean river flow | 84 | 1940–2025 |
| LONE PINE C NR KEENBROOK CA | mean river flow | 76 | 1920–2007 |
| SANTIAGO C A SANTA ANA CA | mean river flow | 60 | 1964–2025 |
| CITY C WATER CO CN NR HIGHLAND CA | mean river flow | 59 | 1928–2024 |
| MILL C NR YUCAIPA CA.+ CANALS CA | mean river flow | 56 | 1920–1985 |
| MEEKS AND DALEY CN NR COLTON CA | mean river flow | 55 | 1921–1980 |
| CAJON C NR KEENBROOK CA | mean river flow | 55 | 1920–1981 |
| SAN ANTONIO C NR CLAREMONT + CN CA | mean river flow | 55 | 1917–1971 |
| SAN ANTONIO C NR CLAREMONT CA | mean river flow | 54 | 1918–1971 |
| TEMESCAL C NR CORONA CA | mean river flow | 51 | 1929–1979 |
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 — 18070203. 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.
| Gauge | Evidence | Established |
|---|---|---|
| SANTA ANA R NR MENTONE 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 |
| LYTLE+BRLNE+COND+INF - W27 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 |
| SANTA ANA R NR MENTONE CN + CN 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 |
| PLUNGE C NR EAST HIGHLANDS 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 |
| DEVIL CYN C NR SAN BERNARDINO 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 |
| CITY C NR HIGHLAND 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 |
| LYTLE C NR FONTANA 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 |
| E TWIN C NR ARROWHEAD SPRINGS 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 |
| CITY C NR HIGHLAND CA.+ CANALS 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 |
| WATERMAN CANYON CREEK NR ARROWHEAD SPRINGS 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 |
| SANTA ANA R A SANTA ANA 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 |
| LONE PINE C NR KEENBROOK 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 |
| SANTIAGO C A SANTA ANA 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 |
| CITY C WATER CO CN NR HIGHLAND 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 |
| MILL C NR YUCAIPA CA.+ CANALS 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 |
| MEEKS AND DALEY CN NR COLTON 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 |
| CAJON C NR KEENBROOK 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 |
| SAN ANTONIO C NR CLAREMONT + CN 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 |
| SAN ANTONIO C NR CLAREMONT 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 |
| TEMESCAL C NR CORONA 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.
| Signal | Held | Counts |
|---|---|---|
| Gauges holding a real record | 20 | yes, 3 or more |
| Years spanned | 127 | yes, 20 or more |
| Values held | 1,660 | yes, 1000 or more |
| Distinct measurements | 1 | no |
| Publishers measuring it | 1 | no |
| Official identifiers | 1 | recorded, not counted |
Where these figures come from
Spatially aggregatedHigh confidence2024
Source: USGS — National Water Information System, USGS site 11051500, 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.