Turn-over

[bgudmundson]

Do rivers like the Bow have a "turn-over" like lakes do after ice-off?

[monger]

No, only stillwaters where the water column gets stratified by temperature.

[DaveJensen]

As above - but one thing we do get here is a period after low elevation run off where the water can warm and hatches occur, followed by an odd warm spell that, while lower elevation run off has finished, the mid to upper elevation reaches snow melt sees in stream temperatures cool off considerably downstream, even though visibility may not fall off too severely. That time frame can see hatches slow down and fish get a little sluggish, feeding windows narrow. I've seen lower reaches of rivers that were in the high 40s come way back down to the high 30s or low 40s even though it's considerably warmer outside. The present weather patter ins similar to this, though it has affected visibility on most of our trout streams.

Hope that helps