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I fished Rock Creek Reservoir once years ago early in the season and found high, cold water and several 12-15 inch rainbows. There are also bass in this lake. Maybe it will be warm enough to turn some of them on. If you go for that sort of thing.
Here's a link to some helpful info on Rock Creek courtesy of our good friends at the Fly Fishing Shop in Welches:
http://tinyurl.com/pap6ge
Here's what Rock Creek Reservoir looks like without such dramatic lighting. (This shot looks like lower water found later in summer.)
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And here's a map from Hwy 26 that shows where to find the place in case you want to drive up on your own ahead of us and get first shot at the hatchery behemoths.
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The weekend weather is supposed to be nice on Sunday. Why not enjoy it getting towed around by net-stretching brutes? Hope to see you there. Tight lines.