2025-09-09 00:00:00 Get quick access to the latest water levels and river flows for rivers in the USA and 20 other countries around the world. RiverApp is the application that contains data from the largest number of hydrometric stations in the world, with over 40,000 sites. RiverApp is the ideal application for all river-related sporting or professional activities: kayaking, canoeing, pack rafting, stand-up paddling, fly fishing, river surfing, hydroelectricity, irrigation, etc.