I just got back from fishing the Missouri River near Craig, Montana. Awesome trip and I highly recommend it anyone. My buddy Matt from work has a friend Jordan living in Helena which is a great base camp. Not that Craig isn't fun but a town of 100 with 150 driftboats has limited night life (tap room scene is doing well in Montana FYI).
We got to the river Thursday morning and had to stop by Headhunter Fly Shop. Headhunters has probably one of the best report/blogs
http://www.headhuntersflyshop.com/blog-fishing-report/
We picked up the hot flies and put in right below Holter Dam. It is a big dam and they are letting a lot of water out - over 8,500 cfs and the bumped the flow to 10,000 that day (ideal range is 3,000 to 4,000, or so I've been told).
I put on my freshly pink painted anchor and we were ready to go. A little side note - I spray paint my anchors because I have lost them either in the river or by leaving at the boat ramp. The pink really stands out and I received many complements on it. If you're in Craig and see pink anchors let me know, I think I started a trend.
Thursday was really difficult with 30-40 mph winds and trying to figure out a pattern. We did manage some nice fish however. Friday was lights out - we double floated the river and found the hot sow bug fly. The 3 of us hooked about 50 fish but had a hard time landing some of the larger fish because we'd put the anchor down to not blow by our spots but reeling a 20+ inch fish into the current has many variables that often go wrong.
Buffs are fashionable on the Missouri and it beats sunscreen - I even find them cool just to wear.
Really the main stretch with the highest density of fish is the bridge at Wolf Creek to Craig. It is about 3.5 miles of river but you can really work sections and with lower water wade around islands.
Above is a shot at the Wolf Creek bridge. In general they call the Missouri the largest spring creek. It is a big river but fairly easy to fish. We indicator fished almost exclusively and needed 2 BB split shot to get down in many spots. Flies are your typical tailwater selection of sow bugs, lightning bugs, San Juan worms, midges and may flies.
Almost all fish were in the 18-20 inch mark with a handful outside the range.
There are lots of fish, and lots of people. We got on the river at 7:00 am and did a double float to avoid the crowds as everyone floated down the river. Overall great trip, phenomenal fish and very good fishing. I'm sure I'd be amazed to see the epic dry fly fishing mentioned in the Fly Fish Film Tour movie "Sipping Dry"
https://www.youtube.com/watch?v=DPWiIvwM1vQ
Get a guide, do it your self, whatever, it's just fun to fish new water.