Clunn's concept is basically this: Upper, Middle, Lower. The idea is basically a limnological designation in that a dammed watershed will be shallowest and usually warmest in the upper sections, and deepest and coldest in the lower section closer to the dam. So, upper heats earlier and fish start their year earlier there. They start their year latest in the lower. On large sprawling waters, the upper may be mostly in post-spawn, the middle spawning, and the lower in pre-spawn/just starting to spawn.
Same can possibly be the same in individual creek arms, although here size (volume) of the arm really begins to weigh in in terms of the amount of difference in timing.
In general, bass move from deeper winter quarters to shallower feeding and/or spawn locations as spring season progresses (warms -essentially). Winter (and often summer) locations are most often in the main lake or lower creek arm areas as adult bass seem to prefer larger water volumes and depths in winter and summer.
Bass are "object-oriented" so they tend to travel from "object" to "object" as they migrate (travel deep to shallow and back again). How this is actually laid out varies with individual water body, or section of a water body. This also happens in natural lakes, and even in ponds. Factors include lake size, depth, clarity, habitat availability, prey type and availability, ... .
Hope this helps steer you in the right direction.