Monroc, Inc.((A SUBSIDARY OF U.S.AGGREGATES)) produces and sells Prestressed, Precast Concrete building components, Ready-Mix Concrete, Sand and Gravel products, and Accessories to the construction industry. Beginning as a sand and gravel products supplier in 1920, Monroc, Inc. has expanded operations to its present status which includes 19 plants in Utah, Idaho, and Wyoming.