I use that website too even if the temps it gives can get wonky when the flow is high at the dam. I also carry a simple thermometer on 3 feet of string to get 3ft down temps where I am. I totally agree that you want to look for an upward trend in water temp. Going from 53F up to 56F is usually better than going from 59F down to 56F for example. I am not going to be able to fish as much this year & being more selective on when I do. I'm looking for a time where the the trend is upwards from where it is now & looks like it might reach 56F. It is just a selective target for when I want to try the next time since I have to be more picky?