Sandlake Road in South Tillamook County Closed at Milepost 6.23 due to Failing Culvert Posted on January 19, 2023January 19, 2023 by Editor Tillamook County Public Works announced today, January 19, 2022 that Sandlake Road is closed at mile post 6.23 due to failing culvert. Reader boards and Signs are being placed for closure detour.