I'd recommend, just a little further north up Hwy. 101. SRC's should be staging, in abundance, at the mouths of Drift Creek and Schooner. Which both feed into, the Siletz. Plus there should be some upstream, as well.
On the fly: The Borden Special; or brown leech pattern about size 6. If spinning: Hot Pink, or Brown Rooster Tails (small 1/8th ounce brown ones for now--they look like small crawdads--that those fish target, just like a protein snack ).
To the south...at Waldport (Alsea Bay), there is another Drift Creek fillin' up with SRC's too. The Borden Special, was specifically designed for those Alsea River SRC's (which locals call Bluebacks).
Pretty sure it is a special type of rod, with no reel.
But I will x2 troutdude's advice. If you hike into the mouth of the Alsea drift creek (it can be done, with a little help from Google maps), it is some of the most beautiful land/water I have fished. I posted some pics of a hike I did in there a year ago, if you can dig it up in the archives.