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USGS 01402000 Millstone River at Blackwells Mills NJ

  Stream Site

DESCRIPTION:
Latitude 40°28'30",   Longitude 74°34'33"   NAD83
Somerset County, New Jersey, Hydrologic Unit 020301050312
Drainage area: 258.0 square miles
Datum of gage: 25.93 feet above   NAVD88.
AVAILABLE DATA:
Data Type Begin Date End Date Count
 Current / Historical Observations     (availability statement)    1981-10-01  2025-09-03  
 Daily Data
    Temperature, water, degrees Celsius  2001-08-01  2025-09-02  3084 
    Discharge, cubic feet per second  1921-08-04  2025-09-03  38011 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2001-08-01  2025-09-02  2013 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2001-08-01  2025-09-02  2007 
    Dissolved oxygen, water, unfiltered, percent of saturation  2001-08-01  2001-08-02  6 
    Dissolved oxygen, water, unfiltered, percent of saturation  2022-08-02  2025-09-03  2097 
    pH, water, unfiltered, field, standard units  2001-08-01  2025-09-02  1953 
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2022-08-02  2025-09-03  1965 
 Daily Statistics 
    Temperature, water, degrees Celsius  2001-08-01  2024-12-01 910 
    Discharge, cubic feet per second  1921-08-04  2023-09-25 37308 
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2001-08-01  2024-12-01 556 
    Dissolved oxygen, water, unfiltered, milligrams per liter  2001-08-01  2024-12-01 552 
    Dissolved oxygen, water, unfiltered, percent of saturation  2001-08-01  2001-08-02 
    Dissolved oxygen, water, unfiltered, percent of saturation  2022-08-02  2023-12-11 353 
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2022-08-02  2024-12-01 534 
 Monthly Statistics 
    Temperature, water, degrees Celsius  2001-08  2024-12  
    Discharge, cubic feet per second  1921-08  2023-09  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2001-08  2024-12  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2001-08  2024-12  
    Dissolved oxygen, water, unfiltered, percent of saturation  2001-08  2001-08  
    Dissolved oxygen, water, unfiltered, percent of saturation  2022-08  2023-12  
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2022-08  2024-12  
 Annual Statistics 
    Temperature, water, degrees Celsius  2001  2025  
    Discharge, cubic feet per second  1921  2023  
    Specific conductance, water, unfiltered, microsiemens per centimeter at 25 degrees Celsius  2001  2025  
    Dissolved oxygen, water, unfiltered, milligrams per liter  2001  2025  
    Dissolved oxygen, water, unfiltered, percent of saturation  2001  2001  
    Dissolved oxygen, water, unfiltered, percent of saturation  2022  2024  
    Turbidity, water, unfiltered, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +-2.5 degrees, formazin nephelometric units (FNU)  2022  2025  
 Peak streamflow 1921-08-08  2022-04-08  102 
 Field measurements 1966-10-20  2025-07-08  397 
 Field/Lab water-quality samples (Legacy QW is frozen as of March 2024, newer data may be found on MLP) 1923-08-12  2024-02-21  416 
 Water-Year Summary 2006  2024  19 
 Revisions  Loading...
OPERATION:
Record for this site is maintained by the USGS New Jersey Water Science Center
Email questions about this site to New Jersey Water Science Center Water-Data Inquiries