Bull Trout restoration efforts at Crater Lake began in 1992, and as of 2013 fisheries biologists have;
- increased the bull trout population from as few as 200 individuals to as many as 6000 individuals,
- eradicated brook trout from Sun Creek inside Crater Lake National Park and Sun Pass State Forrest (Oregon),
- and, installed three fish passage barriers to keep brook trout from returning to Sun Creek.
The threats to Bull Trout survival include: