About Us


Founded in 1923 with only five highway employees, one asphalt plant and a team of mules, Sully-Miller has grown to be one of the premier road and highway, rail and intermodal, seaport, airport, federal/military and specialty contractors in Southern California. On average, the firm self-performs over 50% on all contracts and brings unique resources with a fully accredited AASHTO certified lab and Traffic Control division in-house.

Sully-Miller not only provides our clients with specialized local expertise, staffing and resources to deliver fully collaborated projects, but unmatched technical and financial strength to build infrastructure ranging from port facilities, roads and heavy highways to airports.

One of the values that makes Sully-Miller unique is our employee retention. The average tenure of our employees is 10+ years! We most recently had an employee whose tenure eclipsed 48 years retire. This environment allows Sully-Miller to truly feel like a FAMILY and be a true partner for the community when working with local agencies and owners.

Blue Diamond Materials

As a division of Sully-Miller Contracting, Blue Diamond Materials provides Hot and Warm Mix Asphalt materials for projects within the Los Angeles, Orange, Ventura, San Bernardino and Riverside County areas from five strategically positioned plant locations. Blue Diamond Materials provides the manufacturing expertise to produce the Hot Mix Asphalt on the majority of the paving projects Sully-Miller performs. In partnership with Blue Diamond, Sully-Miller Contracting is one of the only contractors in the region to have a fully accredited AASHTO certified lab. By doing so we design, paving mixes specific to our client’s needs. This business process has helped make QUALITY a core principal for our organization.

Consistent with our pursuit of QUALITY every Blue Diamond Materials plant have been awarded the National Asphalt Pavement Association’s Diamond Achievement and Diamond Quality Status. NO OTHER ASPHALT PRODUCER IN SOUTHERN CALIFORNIA HAS ACHIEVED THIS STATUS.

United Rock Products

Mining of Construction Aggregates at United Rock Products in the San Gabriel Valley has taken place since 1916. Their top-rated 300-acre site is located in Irwindale, California, just 25 miles east of Los Angeles.

United Rock supports the contracting operation by supplying both Blue Diamond Materials and Sully-Miller Contracting with the aggregate materials for the projects they supply.

With cutting-edge crushing and screening operations, United Rock also supports the regions projects. Their automated state-of-the-art truck load-out system can load, weigh, and ticket in as little as one minute. Whether making custom blends or creating new products, United Rock Products has the knowledge and commitment to meet even the most specialized customer needs.


Colas USA

Colas USA companies are part of the Colas Group, the worldwide leader in transportation infrastructure construction and maintenance. The Colas Group is active in the construction and maintenance of road, air, rail and maritime transport infrastructure, urban development projects and recreational facilities. With 55,000 employees spanning five continents around the world, the Colas Group carries out over 100,000 projects each year, backed by a tight international network of construction materials facilities, including: aggregates mining sites, asphalt plants, ready-mix concrete plants, liquid asphalt terminals and emulsion plants.

In 1979, Colas USA began operations in the Northeast with the acquisition of Barrett Paving Materials, a 150-year-old company. In 1998, Colas USA acquired Sully-Miller Contracting, Blue Diamond Materials, and United Rock Products. In doing so Colas USA continued to grow our network of companies, which now allow us to provide most of our products and services anywhere in the United States, from Alaska to Florida and New York to Southern California. Our 5,000 plus employees operates from more than 50 regional offices located across the nation.

Our strong decentralized network of local business unit’s work closely with our customers to provide them with solutions in the areas of preservation, maintenance and expansion of their infrastructure as well as new construction. We are committed to developing and improving products and construction services based on recycling of material, improving of energy efficiency and reducing greenhouse gas emissions. Our association with the Colas Group gives us access to a world of expertise and resources that we make available to our customers through our various local business units.