(253 sites)
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Real-time data are time-series (recorded at fixed intervals) data from automated equipment and represent
the most current hydrologic conditions. Measurements are commonly recorded
at 5-60 minute intervals and transmitted to the NWIS database every 1-4 hours.
Real-time data are available online for 31 days.
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(1,010 sites) |
Daily values are summarized from time-series
data for each day for the period of record and may represent the daily
mean, median, maximum, minimum, and/or other derived value. Daily values include
approved, quality-assured data that may be published, and more recent
provisional data, whose accuracy has not been verified.
Example.
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(1,031 sites)
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Statistics are computed from approved daily mean time-series data at each site.
These links provide summaries of approved historical daily values for daily,
monthly, and annual (water year or calendar year) time periods.
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(973 sites)
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Annual maximum instantaneous peak streamflow and gage height
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(1,660 sites) |
Periodic manual measurements of streamflow and gage height. These measurements
are often used to supplement and (or) verify the accuracy of the time-series measurements.
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Introduction
The USGS in Washington State
currently collects data for about 300 streamflow, reservoir,
water-quality, meteorological, and groundwater sites, of which about
240 have satellite telemetry for real-time data, and another 20 have
other communications equipment for near-realtime data.
The USGS has operated about
1,000 continuous data collection sites since 1895 when the first
streamgage on the Spokane River at Spokane. Additional information
about the USGS data collection program is available from the Washington Water Science Center home
page, along with links below to an array of other sources of water
resources data for Washington.
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Tutorial explaining how to perform a surface water retrieval and understand the results
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