USGS WaterAlert service sends e-mail or text (SMS) messages when certain parameters exceed user-definable thresholds for any USGS real-time stream or raingage, water-quality, or groundwater monitoring site.
USGS WaterNow allows to send a text or email message to WaterNow@usgs.gov containing the USGS Site Number of the gage you want to query (optionally add parameter codes to customize your query). You will receive a response within a few minutes.