Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. State Route 3 (SR 3) is a state highway in the U.S. state of California. It runs from State Route 36 north along the shore of Trinity Lake, Fort Jones and Etna. The route approaches Yreka, intersecting with Interstate 5, and turns east to Montague. The road was numbered SR 3 in 1964, and most of it has been part of the state highway system since 1933.SR 3 is part of the California Freeway and Expressway System and is eligible for the State Scenic Highway System. Caltrans has subsequently designated it as a scenic highway for its entire length.