The route has another trumpet interchange with SR 200 after leaving the Arcata city limits and crossing the Mad River.

The freeway ends in the city of Blue Lake as SR 299 continues east past the truck scales.

[4] SR 299 remains a freeway for a few miles before leaving the Redding city limits and passing through the town of Bella Vista and into the foothills of the southern Cascade Range.

[3] SR 299 continues through Ingot, Round Mountain, Montgomery Creek, Hillcrest (after the rest area), Burney, and Johnson Park.

The concurrency lasts for several miles before SR 299 turns east and enters the city of Alturas.

This was a spur of US 99 running East and West from the junction in Redding, now signed as CA 273 at the intersection of Eureka Way and Market St.

Except where prefixed with a letter, postmiles were measured on the road as it was in 1964, based on the alignment that existed at the time, and do not necessarily reflect current mileage.