Rocky Mountain Underground, LLC Rocky Mountain Underground, LLC Search | Advanced Search | New Members | Coupons and Discounts | All Categories Other >> Division 26 - Electrical >> 26 20 00 Low Voltage Electrical Distribution Rocky Mountain Underground, LLC 3000 Landon Ln Ste 101Nampa, ID 83651 | map | directions John Hilton (208) 400-3365 Visit Site Rocky Mountain Underground is a trenching and excavation company providing dry utility installations for private and commercial customers. Member Since: 2020