FAQ: Pilot Relocation of Wild Rainbows

In this blog post, we 1) present our turbidity and suspended sediment data, 2) explain our suspended load calculations, and 3) provide some additional information justifying why we think that a substantial amount of bed load was transported into the Henry’s Fork in addition to the suspended load. Since first observing high turbidity in Thurmon Creek and the Henry’s Fork downstream associated with the Silver Lake drawdown in November 2025, HFF’s Science and Technology team

The Henry’s Fork Foundation (HFF) has become aware of, and is actively investigating, the recent draining of Silver Lake in Harriman State Park. The sudden draining of the lake released a large amount of fine sediment downstream into Thurmon Creek and the Third Channel of the Henry’s Fork through the Ranch. Although HFF was not informed the lake would be drained, our science team responded immediately, documenting conditions, collecting samples, and assessing the river as