USGS Home
Contact USGS
Search USGS

National Water Information System: Web Interface

USGS Water Resources   

Data Category:
Home Current Conditions Site Information Mapper Surface Water Groundwater Water Quality Water Use Revisions Geographic Area:
United States Alabama Alaska American Samoa Arizona Arkansas British Columbia California Canton and Enderbury Islands Colorado Connecticut Delaware Dist. of Columbia Florida Georgia Guam Hawaii Idaho Illinois Indiana Iowa Johnston Atoll Kansas Kentucky Louisiana Maine Maryland Massachusetts Michigan Midway Islands Minnesota Mississippi Missouri Montana Nebraska Nevada New Hampshire New Jersey New Mexico New York North Carolina North Dakota Northern Mariana Islands Ohio Oklahoma Oregon Pennsylvania Puerto Rico Rhode Island Ryukyu Islands, Southern South Carolina South Dakota Swan Islands Tennessee Texas Trust Territories, Pacific Is U.S.Misc Caribbean Islands U.S.Misc Pacific Islands Utah Vermont Virgin Islands Virginia Wake Island Washington West Virginia Wisconsin Wyoming

Page Loading - Please Wait...

This page will be decommissioned in early 2026. Please find the modernized pages in WDFN that suit you best. Learn more about our modernization plans and timeline.

DESCRIPTION:

Latitude 39°01'36",   Longitude 123°07'46"   NAD27

Mendocino County, California, Hydrologic Unit 18010110

Drainage area: 362 square miles

Datum of gage: 500.01 feet above   NAVD88.

AVAILABLE DATA:

Data Type	Begin Date	End Date	Count
Current / Historical Observations     (availability statement)	1987-10-01	2026-01-22
Daily Data
Temperature, water, degrees Celsius	1965-09-01	2026-01-21	30358
Discharge, cubic feet per second	1939-10-01	2026-01-20	31524
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	2002-01-25	2026-01-21	22575
Dissolved oxygen, water, unfiltered, milligrams per liter	2002-01-25	2026-01-21	22100
pH, water, unfiltered, field, standard units	2002-01-25	2026-01-21	22543
Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU) -- (TS085: YSI Model 6026)	2002-01-25	2008-07-13	5487
Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)	2008-07-19	2017-10-05	9128
Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)	2018-02-07	2026-01-21	8262
Daily Statistics
Temperature, water, degrees Celsius	2016-10-01	2025-12-14	3335
Discharge, cubic feet per second	1939-10-01	2025-11-23	31466
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	2016-10-01	2025-12-14	3279
Dissolved oxygen, water, unfiltered, milligrams per liter	2016-10-01	2025-12-14	3245
Monthly Statistics
Temperature, water, degrees Celsius	2016-10	2025-12
Discharge, cubic feet per second	1939-10	2025-11
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	2016-10	2025-12
Dissolved oxygen, water, unfiltered, milligrams per liter	2016-10	2025-12
Annual Statistics
Temperature, water, degrees Celsius	2017	2026
Discharge, cubic feet per second	1940	2026
Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius	2017	2026
Dissolved oxygen, water, unfiltered, milligrams per liter	2017	2026
Peak streamflow	1937-12	2025-02-05	87
Field measurements	1937-12-21	2025-12-21	1123
Field/Lab water-quality samples (Legacy QW is frozen as of March 2024, newer data may be found on MLP)	1951-04-12	2017-11-01	228
Water-Year Summary	2005	2025	21
Revisions	Loading...

OPERATION:

Record for this site is maintained by the USGS California Water Science Center

Email questions about this site to California Water Science Center Water-Data Inquiries