Hey Gary
Here is some of the info that you wanted. This is from Davis Dam heading south to Lake Havasu.
These are the areas that you need to pay attention to going down river. The wash just after community park, with the floods that Bullhead had several years ago this wash area is filled with rocks and comes out about forty feet now (you want to stay right).

Big Bend (you want to start in the middle and then stay to the left),

just before the Arizona Veterans Memorial / Lazy Harry's (you want to stay to the middle and to the right),

Palo Verde Meadows (you want to stay to the left),

just past the AVI Bridge (you want to stay in the middle),

just past Willow Valley, Kingsley Street (you want to stay to the left and gradually cross over to the right before the rock bar)

and just before the Needles Bridge (you want to stay in the middle.

That pretty much sums up the areas to avoid heading down to Havasu. When the water is high you won't have to worry too much about these areas. In my opinion that zig sag that you have to make just after Willow Valley is the worst of it when making the trip from Laughlin to Havasu. There are a couple that are more obvious just before the Lake that I will see if I can find.