Stream Flow Rates
The following information is from the United States Geological Survey. A ton of info on water resources can be found here. In addition, there is a plethora is great information on regional geology and other earth science related issues and interesting topics. There are links to the National Weather Service, as well.
Waterwatch: [Editor’s Choice****] This shows a great color-keyed map to quickly see relative flow rates around the country. If you are planning a trip you can quickly tell if the flow levels are high, low or normal. From here you click on your state to get a great overview of current flow conditions relative to normal flows.
Specific Watershed and River Flows: If you are looking for hydrologic stream flow rates for a particular river, use the following links to hit your target state. Enter search terms by county, water basin, or hydrologic unit.
If your state isn’t here (and it probably isn’t), copy (Ctrl+C) and paste (Ctrl+V) the entire line URL below into the address bar on your browser. Then type your states’ initials in place of the XX below. Press the Enter Key or hit “GO” on the address bar. This will take you to the specific state of your choice where you can then navigate to the river you desire.