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USGS Current Conditions for Arizona

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Welcome to the NWIS-Web for the Arizona Water Science Center


The majority of USGS Gaging Stations are funded though a cooperative program between the USGS other interested agencies.
Follow this link for information on the Cooperative Water Program with the USGS.


Arizona Water Science Center Home Page
Colorado Basin River Forecast Center (CBRFC) - provided by the National Weather Service, AHPS. CBRFC on an interactive map.
Threatened and Endangered USGS Gaging Stations in Arizona
* IMPORTANT: Next Generation Station Page
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Output formats help Codes help Parameter help

Parameter Help


Parameter codes are 5-digit codes used to identify the constituent measured and the units of measure. Some parameter code definitions include information about the methods used to measure the constituent, but this level of information is not currently consistent in the naming system. There are two types of parameter codes:

  1. Fixed-value codes, where the result value is a numeric code that represents a textual meaning. These codes are described here.
  2. Numeric codes, where the result is a numeric value for chemical, physical, and biological data.

  3. The following table shows an example of several parameter codes and definitions. This table also illustrates how several parameter codes may exist for one type of measurement.
    Parameter Code Parameter Definition
    00910 Calcium, water, unfiltered, milligrams per liter as calcium carbonate
    00915 Calcium, water, filtered, milligrams per liter
    00916 Calcium, water, unfiltered, recoverable, milligrams per liter
    91051 Calcium, water, filtered, micrograms per liter
  4. A complete list of parameter codes, associated groupings can be found here.