3 Creek Lake is fishing quite well, with a lot of diversity going on like we are seeing at East Lake too. Callibaetis, Ants, Beetles, Damsels and Black Caddis are the main drivers of the day but add some Balanced Leeches for sure! 
There is something quite special about getting up to this little lake in the evening in the summer. For me, it’s almost entirely a dry fly game until dark. Callibaetis, emerging midges and finishing with Black X Caddis. 
3 Creek Lake is a good wading lake too, so you don’t need a tube or boat to get to all the fish, but for me I prefer the boat.