From most places on the West Coast, driving to Trinity Lake is fairly straight forward. Follow Interstate 5 to Redding. Then go west on Highway 299 to Weaverville. Next turn north on Highway 3 to Trinity Lake.
Coming from Eureka on Highway 299 is a 2 hour drive to Weaverville .
From the Reno go north on Highway 395 to Susanville, then go west on Highway 36 to Red Bluff before turning north on I-5 . At Redding go west on Highway 299 to Weaverville and then north on Highway 3 to Trinity Lake .