Creek Reservoir Grass Valley Creek Reservoir is located south of Highway 299 along the Trinity River in northern California. Grass Valley Creek Reservoir was created as part of ongoing efforts to restore the Trinity River watershed. Its purpose is to prevent sediment in the highly erosive watershed from migrating downstream to spawning gravels in the Trinity River. Access to the reservoir requires a short hike, and a float tube greatly inmproves fishing access much of the year.
Many small inlets provide cool water refugia and concentrate fish.
Anglers should focus on these cooler areas for better success.