Better late than never response!!
Better late than never response!!
After the fact on this reply... but having grown up in 'Ver-no-where' I can tell you that both Rock Creek and the Nehalem River are very productive waters for Trout.

If you are on Rock Creek prior to the Dam going up, walk up the stream from the swimming pool access at Hawkins Park and fish all of the cover you see from the spillway up to the Water Plant.

Fish the water with little or no weight with light lines. I personally fish mainly flies now, but a free drifted Nightcrawler threaded on a #6 or #8 bait holder hook on a 2 to 4 pound test line. If fly fishing, try drifting some weighted nymphs into the submerged structure. You will pick up dozens of small Cutthroat and Rainbow Trout and from time to time, a really decent 'screamer' Cutthroat or 'hold over' Steelhead.

For some easy fun for the kids, toss a Colorado or Indiana Spinner with a Nightcrawler trailing it into the swimming pool 'drop' and the one down at the Nehalem/Rock Creek merge... that little 'drop' there holds dozens of fish. There are also quite a few 'slots' in the mainstream Nehalem above and below the park that this tactic works in as well. Drop your spinner in, feed out the line then slow retrieve.
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If you have a float tube, float from Anderson down to just below the Green bridge, makes for a great day drift with lots of fish... try the mouths of the feeder creeks and the pump behind Lake Vernonia.

Read the 2012 ODFW Regs really closely as they change things and 'hide' some of those changes in their classic double-talk translation that they talk in... so again, read the whole book!!!
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Good luck and have fun!!!!