I lived in Colorado Spring for about 7 years and there are quite a few places to fish. Just like the previous posts Spinney, Elevenmile, and the South Platte are all good bets. Here are some more lakes and rivers within a 30 minute drive. Just west of where you will be staying is a place called Tarryall Resevoir and Tarryall creek (if going West turn right just past Saint George).I always had good luck this time of the year in the west end of the lake, this the shallow end and allows for some wading if you don't have a float tube. I caught alot of fish out of here a couple rainbows and one brown were 3lbs.+.I didn't fish Tarryall creek that much but I heard it was real good. It's a small meadow like creek. Watch out for trespassing signs because alot of it is private. Another good spot is Antero Resevoir it is just west of you past Hartsel. There are some real hogs in there! As for flies all I can say is HALFBACKS!!! Sizes 8 to 14. They work really well there in the resevoirs, I hardly ever had to change flies. I hope this helps some.