The river level info on the Environment Agency website has recently been moved to the catchily named River and sea levels for England website.
The good news is that the info is easier to read and mobile friendly!
I've been putting it to good use over the last couple of months to get an idea of the stretches of the Rive Avon I've been fishing over at Keynsham. There's two that are handy:
Latest river level information for: the River Avon at Keynsham RL
This is the Jack Whites stretch below the weir running in front of the old Cadbury chocolate factory.
Latest river level information for: the River Avon at Keynsham US
This is for the Crane stretch above the weir heading towards Swinford.
There's also information on the River Levels site:
Although the data is the same, it's displayed slightly differently and has some nice additions like maps and graphs.