SirSnookalot: The wall is a very rough concrete stucko material. This lake is a completely man-made portion of a river that runs through town, so there are no big rocks to contend with. The wall is at about a 60 degree angle from horizontal, so while I could feasibly get down, I doubt I could get back up with a fish, especially without hurting it. As far as your leader solution, is that similar to shanksmare's idea with the paracord and weight?
shanksmare: I have been looking at telescoping nets, however, the length I would need (10') is a bit outside my price range for now. As for the weight solution, that sounds like a good option. The question I have about that is does the shape of the sinker matter or is the weight the important part? I have two 8 oz egg shaped sinkers from a deep sea fishing trip that I could use, but I would like to be sure that they would work.
senile1: The bottom of the wall varies from day to day, depending on the flow from the river and if we have had any rain. Generally it is covered in algae, making it pretty slippery. The wall itself is usually dry, but from previous experience, I know I can't climb up it safely.
roadwarrior: I completely agree. Unfortunately, that's not in the cards right now. Not many boats on Craigslist in Phoenix. And I know I would need about a 14' minimum. I'm a pretty big guy and most of my height is in my torso (bad balance in little boats.)
geo g: I agree that it would be better to fish elsewhere. I usually fish this lake when I can't make it out to the larger desert lakes. The are I usually fish has been getting a lot of pressure lately and doesn't produce like it used to.
Thanks again for all of the replies. I now have several options to recover fish from these spots. I will probably try the milk crate and the "weight on paracord" idea until I can get a proper net and/or boat.