While I prefer prime lenses, there are zooms available to cover this entire range if you are limited to only one lens. Keep in mind that moving water makes a great background for shots of rods and tackle. If you have a cloudy day and a tripod, you might want to give this a try. You will need a small aperature of f16-f22 and a slow shutter speed to blur the water. Meter off a neutral colored object which receives the same amount of light as the scene you are shooting. (see attached)

You can check out my web site, under "Fishing Around" if you want to get any more ideas.