Reddit reviews A Fly Fishing Guide To Rocky Mountain National Park

Don't limit yourself to just below the dam. Hike to one of the lakes in RMNP (lower elevation lakes only as most are still iced over). Sprague lake is a good one to hit. Fish the streams in the park, such as the Big Thompson in moraine park (park near cub lake trail head and just fish upstream), glacier creek, Fall River, etc. Drive over trail ridge road (if it's open) and fish the Colorado headwaters in the kawuneeche valley. Also check out the Lake Estes inlet.

Stick and move is the name of the game. Water levels will be high in the streams due to runoff. So be careful around fast moving water. You can still catch high numbers during this time of year though. Use worm imitations in purple or hot pink colors. Fish will be stacked along the edges in slack water and you don't have to be as stealthy when approaching. A double worm rig can catch a lot of fish, just add some weight to get them down in the water column. Snob fly fishermen will frown at using worms, but fuck them, as you'll be catching fish all day.

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If you ever come out during the summer, this will be your Bible

Tight lines, and have fun.