Shaping California's Infastructure Since 1969

STIMPEL-WIEBELHAUS ASSOCIATES, INC.

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TITANS OF INFRASTRUCTURE

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Since 1969, Stimpel-Wiebelhaus Associates has been the force behind Northern California’s most complex infrastructure projects. We don’t just build bridges and dams—we bring the materials, the muscle, and the mastery to make it happen. With our own quarries and fleet, we control the process from the ground up. No fluff. No shortcuts. Just decades of heavy civil expertise that delivers when it matters most.

  • Industry-Leading Safety & Standards
  • Full-Scope Heavy Civil Expertise
  • CalTrans-Certified Limestone
  • Professional-Grade Trucking Solutions
Skid steer on shasta lake.
CONSTRUCTION

STRENGTH IN DETAIL

At SWA, we command an elite range of heavy civil construction capabilities. Our expertise spans massive dam projects, precision excavation, advanced concrete work, and intricate bridge construction. With our seasoned teams, cutting-edge engineering, and unwavering commitment to quality and safety, we don't just meet industry demands – we set new standards. Every project benefits from our comprehensive in-house technical prowess, from seismic monitoring to professional engineering services, ensuring superior results from groundbreaking to completion.

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Mountain Gate Quarry aerial view
MATERIALS

QUALITY QUARRIED

The region's premier limestone source towers above competitors, delivering unrivaled purity that commands exclusive CalTrans certification for mission-critical bridge construction. Our precisely pH-balanced stone doesn't just meet standards—it defines them, transforming everything from vast agricultural expanses to prestigious landscape projects with superior quality that professionals demand. This isn't just stone; this is excellence excavated, where every grain delivers the gold standard. When quality matters, there's only one choice: Mountain Gate and Bear Gulch Quarry.

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Semi Truck hauling heavy equipment
TRUCKING

HEAVY HAULERS

White Rock Trucking powers Northern California's earth moving needs with a versatile fleet ready for action. From our robust 10-wheel dumps to mighty 20-ton semi-end dump trailers, we deliver the perfect hauling solution for your project. Whether you're moving limestone from Mountain Gate Quarry or transporting aggregate to your construction site, our rental fleet brings professional-grade power to every job. We don't just rent trucks – we provide the muscle to move your project forward.

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LET'S MOVE MOUNTAINS

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