They are submitted by guides, local anglers and the writer themselves. They are compiled weekly and then put into the format you see. If a lake does not have someone to provide a report you will see it listed as no report available. The info is updated weekly BTW.
If ramps are not usable, if there are water hazards or if certain restrictions are implemented you will see that listed as well. You will get clarity, water level, temp range and a brief report for each species of gamefish when possible.