Lower Monumental Dam Devil Canyon Rd Kahlotus, WA 99335 Phone : (509) 282-3218 Business Category Government Offices-Federal Legislative Bodies Us Government--lower Monumental Dam, Control Room Kahlotus, WA 99335 Phone : (509) 282-3218 Business Category Government Offices-City Village & Twp Government Offices State & Local Government Offices & Public Schools U S Government--corps Of Engineers, Control Room Devil Canyon Rd Kahlotus, WA 99335 Phone : (509) 282-3218 Business Category Government Offices-Federal Government Offices-City Village & Twp Government Offices State & Local Government Offices & Public Schools