On December 6, 2017, the Snohomish County Council in accordance with Chapter 46.09 RCW approved Ordinance 17-032 creating chapter 11.50 SCC allowing the operation of Wheeled All-Terrain Vehicles (WATVs) on certain unincorporated county roads with posted speed limits of 35 MPH or less. Ordinance 17-032 became effective on December 21, 2017.
On September 26, 2018, the Snohomish County Council amended the chapter requiring all persons operating WATVs on county roads to carry proof of liability insurance in compliance with, and with coverage limits at least equivalent to the amounts set forth in Chapter 46.29 RCW. Additionally, county roads designated for WATV use were amended by removing the segment of Sultan Basin Rd from Kellogg Lake Rd to the end of the paved road located near the southwest side of Spada Lake and added Old Owen Rd, Mann Rd and Ben Howard Rd, which all have posted speed limits of 35 MPG or less. A new map replaced the original map to help illustrate the changes with roads designated for WATV use. Ordinance 18-055 became effective on October 16, 2018.