Castle Creek was blocked by the massive debris avalanche from the 1980 Mt. St. Helen's Eruption which created Castle Lake. Castle Lake has never been stocked, however during a 1991 lake sample, Rainbow Trout were found indicating possible migration from Coldwater Lake. All trout production is wild.
Access can be difficult due to a closed road that leads to the lake. Contact National Volcanic Monument 360-449-7800.