National Geographic has a great site about rivers that you should visit.
The United States Geological Survey has good information and comparison charts on earth's rivers and streams.
Idaho State University's Water Resources Research Institute has a site that explains the importance the the Snake River's Tributary Basins.
Check out these BBC Learner Guides on the Water Cycle and River Landforms. Here's an older version (no longer updated).
Howstuffworks has a great article on floods that you will want to check out.
Advanced notes on the geography and geology of rivers.
The U.S. Geological Survey offers a number of water-related data sets about Idaho water, including this interactive map of river streamflows.
This animation from Exploring Earth will help you explain how waterfalls erode rivers. Also from Exploring Earth's menu, look at Chapters 12 -16 which will provide you with some awesome animations to add to your river unit.
Great activities to teach about the water cycle.
Free River worksheets to download and use with your class for your rivers lessons at 3D Geography.
NOAA has great resources on the Water Cycle, including an engaging lesson plan with student handouts and 3-D paper craft.
The Colorado Springs Utilities has a more detailed Water Cycle diagram to print and fill out.
EdHelper has worksheets and lessons of all kinds and grade levels on rivers. Take a look.
Two lessons on weathering and erosion.
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