USGS Water Data

• Find monitoring sitesFind USGS monitoring sites (river gages, lakes, wells, springs, weather stations) by state, county, type, what they measure, name or map area. Each site comes with its number, location, what it measures and a link to its page. By default only sites reporting real-time data are listed.
• Find sites near a locationFind USGS monitoring sites within a distance of a point, nearest first, with how far away each one is and what it measures.
• Get site detailsGet a monitoring site's name, type, location, county and state, altitude, drainage area and watershed, and for a well its depth and aquifer. Says so when there is no such site.
• List what a site measuresList everything a site records: each measurement, whether it is real-time readings, daily values or annual peaks, since when, and whether it is still recorded.
• Get latest readingsGet the newest reading of every sensor at a site, such as streamflow, gage height (water level) and water temperature, with when it was taken, whether it is provisional, and any notes such as ice. Streamflow, gage height and water temperature are also given on their own for easy use.
• Get readings for a time rangeGet a sensor's readings (usually every 5 to 15 minutes) for a time range of up to 3 years, with the low, high, average and latest. Leave the times empty for the last 24 hours.
• Get daily valuesGet a measurement's daily mean, minimum and maximum (or daily total, for precipitation) for a range of days, with the range's highest and lowest. Leave the dates empty for the last 30 days.
• Compare to normalCompare a site's latest reading with the same day of the year in every past year on record: the typical (median) value, the record low and high, where today falls as a percentile, and a plain answer such as Below normal or Much above normal.
• Get typical values for the yearGet what is typical at a site for each day or month of the year, from its whole record: mean, median, record low and high, and percentiles, with how many years they cover.
• Get monthly or yearly statisticsGet the mean, median, minimum, maximum and percentiles of a measurement's daily values for each month, calendar year or water year in a range. Only reviewed (approved) data is counted, so the latest months may be missing.
• Get groundwater levelsGet the water levels measured in a well, newest first: depth to water below the land surface and the water level's elevation, with how much it changed over the measurements listed.
• Get field measurementsGet the values USGS hydrographers measured by hand on site visits, such as discharge and gage height, newest first, with how they were measured and how accurate they were rated.
• Get annual peak flowsGet the highest discharge or gage height of each water year (October to September) on record, newest or largest first, with the record peak and notes such as dam regulation.
• Check flood levelsCompare a gage's latest water level with the places nearby that USGS has surveyed as flooding at a set level (roads, bridges, boat ramps, buildings): which are flooding, and how far the water must rise to reach the next one. Says so when a gage has no surveyed places.
• Find places flooding nowList the places USGS has surveyed near its gages (roads, bridges, boat ramps, buildings) where the water is at or above their flood level right now, across the country or in one state.
• Get site camera imagesGet the images from a site's public river camera: the newest one in three sizes, a time-lapse video when the camera makes one, and its recent images. Says so when the site has no camera.
• Find river camerasList the public cameras at USGS sites in a state, each with the site it watches and a link to its newest image.
• Get water quality samplesGet the results of water samples taken at a site and analysed in the field or a lab, such as nutrients, metals, bacteria or pesticides, newest first, with units and whether each result is final. Leave the dates empty for the last year.
• Look up parameter codesFind the 5-digit codes USGS uses for what it measures, by code, by words in their name or description, or by group, with the unit each is reported in.

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