Pendland (or is it Penland) Lake east of Heppner is a great place for trout fishing and camping (free, but primative sites with no running water and only one or two pit toilets... bring your shovels and own Toilet paper).
The lake is stocked once a year with 2000 fingerlings, but if there isn't a big winter kill there can be some very nice rainbow trout in there. In previous years I have marked 19-25 inch fish with a Fishing Buddy fishfinder made by Bottomline (no longer in business... Hummingbird took them over and closed the plant, but Hummingbird makes some portable battery operated fish finders too). I have caught 13-15 inch rainbows there in previous years as well (limited out in an hour one year), but this year my wife caught the biggest trout at 12 inches and the rest we caught were in the 8-9 inch range.
Go through Heppner and turn left (heading east) to go to Willowcreek Resevoire, pass the resevoire and keep going about 30 miles or so. You will pass Cutsforth park (fee camping with running water, and a small creek which has some nice trout) and go another mile or two up the road.. follow the forrest service signs to Penland Lake.
Dave