I've taken this boat to clear lake once, back when I had my 5hp. It took about 45 minutes to go from lakeport to Rodman lol. With the 15hp, and just me in the boat with a medium amount of gear, the boat runs about 25mph. With two people it probably slows down to 15-18mph.

Last weekend I took the boat out on Berryessa and ran from Cappell Cove to the dam and back. That was my first real test on a bigger lake with a lot of chop and wakes and I thought the boat took it well. I fished Pedro quite a bit earlier this year and it was fine then too, although the weather was never really that bad.

I assume you've seen Clear lake when it's nasty... and I would not recommend being out there in this boat then, but it would be fine for calmer days or up on the North end of the lake. If its April and it's blowing and the narrows are huge, no way. Hope that helps :)