birddog -
I am not that familiar with the Stevensville area as far as lake fishing is concerned, though someone else here may be able to help. Certainly the Missoula area fly shops would be able to offer some advice on grayling in the area. You can also check on [url=http://www.fwp.state.mt.us:aab65]www.fwp.state.mt.us[/url:aab65] under fishing, and type in the name of lakes in the area to find what types of fish they have in them. The closest lake I know of with plentiful grayling is Heart Lake near Lincoln, MT. It requires a hike to get into the lake also, but has tons of grayling. There is another lake near Helena you can drive to with tons of grayling, but its closed this year for repair to the earthen dam. I expect you can find something closer to Stevensville by asking around the area.