RiverFlows

RiverFlows offers a quick and easy way to view data from river gage sites using an Android device. This is useful for fishing, kayaking, rafting, canoeing, or any other pursuit that requires tracking lake and river levels in the U.S.

Supported Data Sources:
USGS
NOAA
US Army Corps of Engineers
Colorado Department of Water Resources
California Data Exchange Center

The Riverflows app and widget are now open source!: https://github.com/robinmj/riverflows