The USGS has a great tool called WaterWatch. The site gives real-time information from stream flow sensors around the country. In addition to giving information about how the current flow compares to historical data, the information would be very useful to anyone doing water rescue across the country. This site provides one more example of why SAR incident command posts will need to have a good internet connection sooner rather than later and how incident commanders will need to broaden their thinking in the kinds of information they can have at hand.