Madison’s growth from a capitol city on an isthmus to a thriving regional hub has always been shaped by the land—and the land here demands respect. The glacial history of the Four Lakes region left behind a patchwork of silty clays, outwash sands, and organic deposits that make every construction project a conversation with the subsurface. When a new subdivision goes in on the west side or a commercial lot is redeveloped near the Beltline, the subgrade isn't just dirt—it's the loaded spring that will either support your pavement or fail it. Before you spec asphalt or concrete, you need the California Bearing Ratio nailed down in a controlled environment. Our lab handles the soaking, swelling, and penetration phases of the laboratory CBR test so you know exactly what your soil can take after a Wisconsin winter. We often pair this with grain-size analysis to understand the fines content driving frost susceptibility.
A soaked CBR value below 3 in Madison’s silty subgrades means you’re not just thickening pavement—you’re redesigning the section, period.
