So what's a fly angler to do when stream conditions are in transition & the water is a bit high & with color? One solution to find trout in these situations is go where they're almost certain to be no matter. Two types of stream locations come to mind: bridges & seams. Both bridges & seams are good any time of the season, but they are especially good to try if the water is high, fast, & off-color.
Bridges also can give you a sense of what bugs will be on the water. Often the mayflies will collect on the supports of a bridge to molt. Study those bugs, as they'll soon be falling spent onto the water after they've mated & laid their eggs. You can also see the bug activity pick up at a bridge, as both the bugs & the birds that eat them become more active under & around the bridge & its supports.
Another reason why trout like bridges is because the water 'piles up' above them. Often the water gets channeled down at a bridge into a more narrow flow which creates deeper spots & changes in the water flow. Here slower water meets faster water (which is also why they're good spots to fish when the stream is high). These spots where faster flows butt up against slower water creates what we call a "seam"...........
When you fish a seam, you typically want your fly to travel the water just on the edge of the slower flow. It's much easier to managed your line here & besides, it's where the trout are. You should look for seams every time you go fishing, but especially in marginal conditions when the stream is high. You'll know that the trout would rather hang out in the slower water rather than work their tails off in the faster flows.
Arthur Ransome, in his old book "Rod & Line" has a chapter on dealing with adverse fishing conditions. His approach to poor weather & conditions is to not look at the obstacles, but rather to look for the elements of the stream conditions that are good - the elements you can work with. You still might not catch a trout, but you've done your best to put as many odds as you can in your favor. At least by looking at it from that perspective, you stand a chance of catching a fish no matter what shape the stream is in that day.......
......And if conditions are so bad that fishing is all but impossible, at least you can explore & enjoy the wildlife, plants, & beauty that surround the stream!