2.5ft high would make it 166.9. But you have to factor in full moon and tidal swing...

Tidal swing a factor on these reservoirs ???

That would explain the fluctuations in water level....

Where are you coming from? Where do you plan on fishing?

Both locations have plenty good as far as launching. It's mainly about proximity. You had previously said you wanted to fish the south end. If that's the case, then Twin Dikes or the Public Ramp by Umphreys would be fine for you.

Tidal swing a factor on these reservoirs ???

There are fish on Caney Island. They are tight in the flooded willow trees and buckbrush. You have to dead stick your bait up in trees. Pitch it in and do not move it.Trig with 1/4 or 5/16 tungsten weight with 8" Zoom Green Pumpkin Lizard did good for us. Try straight shank 5/0 hook. (Wide gap gets tangled in the limbs.) Wear your "big girl panties" because it's a gunfight in those trees when you hang one! Don't go taking a "knife to a gunfight" either. minimum 20 lb fluoro. Braid will work but if there is any wind the braid floats and tangles in the limbs. The fluoro tends to slide easier in the brush. Lots of smaller but quality fish and an occasional bigger one if you can get them out. Plan to loose 1/2 of the fish that bite. They wrap up deep in the trees and are very hard to get out. The key is to fish slow. and then slow down some more. Oh yeah watch out for snakes in the trees. There were several sunning and didn't want to move!