.... to see if I would Yaak up MT some more? Not details or zippers.

But 4 other well known rivers in 4 directions from Missoula I'll mention; in addition to the Clarkfork Saltine posted. For good bank angling there are the Blackfoot R. and Rock Creek; northeast and southeast of town, respectfully (check the regs - great fly waters). South of town is the Bitteroot R., which has some good boatable sections. My favorite river to driftboat, and worth the further drive, is the Kootenai R. in the northwest corner of the state. The Libby C.of C. can advise you about launches and sections to boat, and names of local d-boat guides.

May and June high cold runoff can sometimes mean using sinktip lines and weighted nymphs. As Saltine mentioned, that fly shop in town can advise you best. They may reveal some great smaller zipper fly streams too; keep 'em quiet. Sections open to gear and bait can be great that time of year. You can even use steelhead techs on the big 'bows of the Kootenai. Good luck on the water conditions.