What is the terrain like between Eugene OR and Redding CA?|139066

I am from the east coast and am planning a bike trip for a few days...and was wondering basically how hilly or mountainous is it? and anyother descriptions would be helpful...Thanks!

You must know about this area already because those two cities perfectly mark the mountainous area
along the I-5 corridor. Hilly, you bet, with long stretches each of ups and downs. Stone beautiful.