>>681303I'm in sort of east of rockies Canada. Not sure if you have boatmen but here there are a lot all year round but especially in spring.
The black leach is pretty standard. I just played around with colors. I tried a few combos to test effectiveness one time... deep reddish purple was ok, jet black was good, the one I came up with was my attempt to make something that had the look of something with blood in it and a bit of contrast so a black body with brown hackle and a dark maroonish marabou tail. When a fish sees the tail it looks up to the silhouette and sees the dark body with a tail that has a reddish tinge on the edges ans fluttering hackle that is also a bit lighter. It's a standard wooly bugger but the colors are unique. They are fairly general as well so I find I can get more chances if I miss the fish the first time. I have one egg sucking leach with a red egg and jet black body and tail and I get one try with that one and then the fish recognize its bait. I also recommend tying the tail fairly dense and about 1.5" or 3.5cm long as about the optimal length.
The attached pic is not the fly but the colourings I'm talking about. The hackle winding is like a brown cock feather, fairly long like in your picture. You can experiment with sparkle. I find it makes it more visible but can make a second chance with the same fish harder to come by. The more specific your fly the less forgiving the less chances you seem to get if you miss a strike.
Another fly that is quite good here is freshwater shrimp... usually green or orange. They're called scuds.
over here we have: rainbow, brown, brook, cutthroat, rainbow, and bull trout.