05/19/2026
As an attempted solution to control Green Mountain Reservoir’s gill lice problem, Colorado Parks and Wildlife stopped stocking kokanee salmon and rainbow trout beginning in 2015.
Then in 2020, CPW resumed the stocking program — but with some major changes. Instead of the 300,000 kokanee salmon the reservoir used to receive every year, they began stocking only 200,000 fish, and only every other year. So far, kokanee have only been stocked in 2020, 2022, and 2024.
Here’s the really interesting part: we aren’t even supposed to see the 2024 kokanee showing up as full-size mature fish until next season. Yet even during the “off years,” when there technically shouldn’t be mature 3½-year-old salmon in the lake, we still catch them.
That’s exciting because it strongly suggests there may be some natural reproduction happening in Green Mountain Reservoir. These salmon that don’t seem to come from the hatchery do not carry the Gil lice, or have just a couple lice per gill. and that is incredible, and points to genetics as a solution to the lice.  Something about these possible naturally hatched fish, gives them the ability to shed the lice.
This season is one of those off years where we supposedly shouldn’t have mature hatchery salmon yet… but we’ve already been catching a few. Today, Mark had an awesome day landing around 15 rainbow trout along with 4 big, fat, beautiful kokanee salmon!
Green Mountain continues to surprise us every season.