USGS Current Water Data for the Nation
Water and streamflow data for the nation is collected and recorded within hours of being collected. Tools are in place to create time-series and current conditions tables. There are data options for the groundwater table, streamflow, lake and reservoir table, water quality, and several other pieces of water-related data sets.
Format and Retrieval
There are automated tables as well as an option to build a custom table for current water conditions.
While the data is updated every few hours, real-time data is provisional and subject to revision. Data points range in frequency from 15 minute intervals to 60 minute intervals.