Are the rivers on the way up or down? Find out here. Click one of the rivers below to find out your local water levels. Most rivers fish best when the water is coming down and clearing after a storm. Every river has its optimal water level and you will figure this out after many times of fishing on the river. Keep track of what level the water is when you have a good day of fishing and you can bet that in the future you will have similar success with this water level.