Wash. Admin. Code § 173-175-725
(1) The department may perform nonroutine inspections of dams with any downstream hazard classification, separate from the periodic inspection program. The purposes for these inspections include, but are not limited to, the following:
[Statutory Authority: RCW 43.21A.064, 43.21A.080, 86.16.061, 90.03.350 and [90.03].470. WSR 04-16-122 (Order 03-08), § 173-175-725, filed 8/4/04, effective 9/4/04.]