The US National Oceanic and Atmospheric Adminstration (NOAA) has an awesome hydrologic information page to help you plan boating and other activities on US rivers. If you just want to know the latest river level, the NOAA's Ark skill will look it up for you and answer by voice so that you know what conditions to expect. This skill is not developed by or affiliated with NOAA or the National Weather Service, but is a big fan!
“Alexa, ask Noah's Ark river stage of Mississippi River at Baton Rouge”
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