National Weather Service Advanced Hydrologic Prediction Service...
Will a river flood soon? A very important local, and intensely geographic question. This site has data for thousands of rivers in the USA, to assess when flooding might occur, and how severe the flooding may be . This Hydrograph shows the Pawtuxet River in Cranston RI (from my neck of the woods). Students can do more with data than we often allow them in classroom settings
(For national map, click on "RIVERS" under the NATIONAL tab).
Via Seth Dixon