My <$0.02...
Looking at the gauges, it's not a significant influx of water to the streams.
That said, I'm pretty darn certain it won't hurt one tiny bit. "Sweetens" the water, adds a smidgen of color (or more than there was at least), and throws some terrestials (land-based food) into the water.
The water won't be teeming with fall chinook, but any amount helps. Might have stirred the summers up just a tad.
Why don't you go see for yourself?