Yes you can fish the lake at night. Our club, the North Kern Float Tubers are having a night tournament at Success the 28th. We would love to have you show up if you are interested. This year the club is fishing Success, Kaweah, and Nacimiento. We have one tournament a month and are looking for new members. I agree that launching from the bridge is a good bet. There is a small area to park your vehicle by the bridge and you can take the trail down to the water. Amber/green red flake worms can be awesome. Would also try senkos in the trees.
If interested in the tournament you can e-mail me at mrbasslips@aol.com
Aaron