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USGS Parameter Group Data Types Start Date End Date
Biological Water-quality 1974-01-23 1981-09-01
Information Water-quality 1944-10-01 2022-10-06
Inorganics, Major, Metals Water-quality 1944-10-01 2022-10-06
Inorganics, Major, Non-metals Daily Values, Unit Values, Water-quality 1936-05-02 2022-10-06
Inorganics, Minor, Non-metals Water-quality 1972-09-21 2022-10-06
Inorganics, Minor, metals Water-quality 1936-05-02 2022-10-06
Microbiological Water-quality 1936-05-02 1995-08-30
Nutrient Water-quality 1936-05-02 2022-10-06
Organics, PCBs Water-quality 1977-05-12 1982-05-03
Organics, other Water-quality 1936-05-02 2022-10-06
Organics, pesticide Water-quality 1975-03-11 2021-05-12
Physical Daily Values, Unit Values, Water-quality 1890-10-01 2023-02-06
Population/Community Water-quality 1974-07-24 1981-09-01
Radiochemistry Water-quality 1936-05-02 1995-03-27
Sediment Daily Values, Water-quality 1962-03-13 2022-05-09
n/a Peak Measurements 1786-10-05 2022-02-20
n/a Site Visits 1897-03-31 2022-10-31
n/a USGS Annual Water Data Reports Site 2006-01-01 2022-01-01
Water Data for the Nation inventory

Concrete control since Aug. 29, 1916. Prior to Oct. 1, 1928, non-recording gage at Walnut Street Bridge 600 ft upstream, and Oct. 1, 1928, to Aug. 31, 1975, water-stage recorder at site 3,170 ft downstream, all gages at same datum. Water temperature data collection at the City Island site was discontinued on March 25, 2015. Regulations and diversions from 15 flood-control reservoirs upstream, combined capacity of 1,571,000 acre-ft. WATER QUALITY DATA FROM THE WALNUT STREET PIER LOCATION IS SEASONAL AND IS NOT TRANSMITTED VIA SATELLITE TELEMETRY AND THEREFORE WILL ONLY BE UPDATED ABOUT EVERY 8 WEEKS. Water-quality parameters at this station can vary substantially at different locations in the river. Therefore, water-quality data displayed here characterizes conditions only at the location where water-quality equipment is deployed. The 30-minute precipitation data for this station are temporary and will only be displayed for 120 days. Time series of 1-hour or cumulative daily values will NOT be available for retrieval following the 120-day display period. Although the instrumentation is calibrated at least once a year, the temporary classification means that documented routine inspections and other quality assurance measures are not performed that would make the data acceptable for archival, retrieval, or future use in general scientific or interpretive studies.
Metadata Element Location Metadata Metadata Code
Site identification number
Site name
Site type
DMS latitude n/a
DMS longitude n/a
Decimal latitude n/a
Decimal longitude n/a
Latitude-longitude method
Latitude-longitude accuracy
Latitude-longitude datum
Decimal Latitude-longitude datum NAD83
Country n/a
Land net location description n/a
Name of location map n/a
Scale of location map n/a
Altitude of Gage/land surface n/a
Method altitude determined L
Altitude accuracy n/a
Altitude datum
Subbasin hydrologic unit
Drainage basin
Topographic setting
Flags for instruments at site n/a
Date of first construction
Date site established or inventoried n/a
Drainage area
Contributing drainage area n/a
Time Zone abbreviation n/a
Site honors Daylight Saving Time
Data reliability
Data-other GW files n/a
National aquifer n/a
Local aquifer n/a
Local aquifer type
Well depth n/a
Hole depth
Source of depth data n/a
Project number n/a

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