Stewart Companies

western slope materials logo and aggregate yard
Westerns Slope truck loads gravel
Conveyors at Western Slope Gravel
Aerial view of Western Slope Sand and Gravel yard
heavy equipment at Western Slope Sand & Gravel


Western Slope Materials is a family-owned and operated aggregate mining and construction materials supply company based in Carbondale, Colorado. With pits located in Silt and Carbondale, we provide construction aggregates, crushed stone, natural stone, concrete aggregates, concrete materials and ready-mix concrete to the Aspen, Snowmass, Roaring Fork Valley and Vail Valley areas of Western Colorado.

At Western Slope Materials, we provide high-quality aggregate products and unsurpassed customer service. Visit either of our pit locations to meet with one of our friendly and experienced team members for help with all of your sand, stone, gravel and concrete needs.

Western Slope Materials and its affiliates have a rich history of serving the Roaring Fork Valley’s aggregate needs for over 20 years. As an experienced team with civil engineering, sitework and building construction backgrounds, we apply our valuable expertise in order to provide our clients with the highest quality products and service.

In addition to meeting our clients’ needs, our locally-owned and operated company is fully invested in the communities it serves. Through memberships with regional industry affiliations and support of local tradesman and businesses, Western Slope Materials continues its long-standing commitment to the community.


14682 Highway 82
Carbondale, CO 81623


Tandem Delivery

End Dump Delivery

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