Last time been there Mar 5-7 for 2 nights. Water level in the lake is full, from the Devil's backbone trail seen a bunch of huge (2-3 feet) fish, probably carp or bass. Regretted I didn't take my kayak and a fishing gear! There is huge amount of waterfowl, including large geese and ducks, a lot of annoying squirrels as well ;)
That time park was open 75% as per the rangers, but I hope it is now 100% after the Mar-10. The only downside they don't have a full hookup sites so if you are staying longer than a couple of nights in your RV, be prepared to travel to a dump station every other day or so. On an opposite side the newly built (and renovated) restrooms with showers are top notch! Way better that a 4-star hotel, seriously! Very clean and well maintained! Overall the park is very well maintained! There is a number of cabins along the lake just across the marina and the gift shop. There is also option to rent a kayak or a canoe, but it was closed due to CCP virus.