Lake Powell question

[Bigcat]

I am wanting to go to Lake Powell either the end of April or beginning of May to hit the smally spawn. I fished it two years ago when we stayed at the south part of the lake (Wahweap). I am thinking about going to Bullfrog this time because we have access to a house boat there. My question is this....Does the smally spawn happen about the same time in the middle part of the lake (Bullfrog/Halls crossing) as it does in the south part of the lake (Wahweap)? I know the spawn is temperature dependant. So asking the question another way.... Does the water in the south part of the lake warm faster since it is farther away from the cold water Inlet source? And if so how far delayed is the smally spawn at mid lake than south lake? I will also post this question on Wayneswords.com as well. Thanks for your help!
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