Sierra Excavation has not yet been reviewed on MojoPages.com. Sierra Excavation is located on 21158 Knox Rd in Twain Harte. Services offered include: Road Building, Basements, Retaining Walls, Underground Utilities. They specialize in these structures and sites: Utilities, Underground, Roads, Retaining Walls, Pools, Basements. They can be contacted by calling (209) 586-5088 . .