QUOTE (Ben @ Mar 3 2010, 03:57 PM)

Hopefully Snowbear chimes in.
I just finally ran across this thread. Thanks for the compliment Ben, I don't consider myself anything more than an interested student, but I'll try to add something that hasn't been stated already.
The Missouri River is populated with some fairly large trout. This tailwater also lacks a lot of visible structure, so the traditional runs, pools, riffles, etc are often absent and that's a bit of a challenge to many. The slow moving and sometime near glassy "Spring Creek" like surface adds to the challenge.
A few things I've learned about the Missouri
1.
Drag. If you can't eliminated drag, even micro-drag, you will have a very hard time on this river. Drag is evil.
1a. If you ignore that you are on a tailwater and think that your success on freestones will of course guarantee success on the Mo, prepare to be spanked by the trout.
Casting dry flies upstream to Cutts or stocker rainbows on freestone rivers works really well. Do that on the Mo and you'll mostly get refusals.
Learn to throw really great reach casts partially downstream so that the first thing the trout sees is your fly, and life on the Mo becomes momentous.
But, remember, DRAG FREE!
2.
Spooked Fish. In a nutshell, it you aren't going to catch a spooked fish on the Mo.
2a. Wade very, very, cautiously with a boatload of stealth. If you want to know how to wade the Mo, watch a Heron. He doesn't make 60 foot casts, he catches fish between his feet because of stealth.
2b. If you are fishing from a driftboat, wear clothes that blend with what's behind you. A white T-shirt will put down more fish than you can imagine. Think about what the trout's greatest natural predator looks like. Yup, those osprey, pelicans etc all are white underneath. If you mimic their threat, they will flip you the fin and leave.
3.
Hatches and Patterns. Tailwaters do not have enough O2 and rocky substrate to support large stoneflies. Throwing large stonefly patterns will work at hopper time and during a few other times of the year, but for the most part, think smaller. There is a huge population of scuds in the Holter to Cascade section, more so closer to the dam. Buy or tie small PTs, Scuds, and whatever the shops are telling you is working and you'll do better. If you are not having any hits, and you've eliminated drag, drop your pattern size down instead of going up.
3a. Of the 4 orders of insects, Caddis is what they will often key on during the summer months, but in early April, you'll likely have better luck fishing midge clusters and Baetis patterns.
3b. Cripples, stuck in the shuck, transition patterns, stillborns, are going to produce better than high riding quill wings etc overall.
That's about all I have time for now. Keep in mind that there is no absolutes, so there's an exception to everything I just wrote.