Excavating near the Red River in downtown Fargo presents a completely different challenge than cutting into the dense lacustrine clays further south near Davies High School. The alluvial deposits along the river corridor hold groundwater just a few feet below the surface, while the southern benches sit on stiffer, overconsolidated glacial Lake Agassiz sediments that can stand almost vertical for days—until they don't. We have instrumented shoring systems within 50 feet of the historic Fargo Theatre, tracking lateral deflection in real-time as the contractor stepped down through interbedded silts. That kind of proximity to sensitive masonry demands monitoring arrays that update every 15 minutes, because the window between stable and problematic in Fargo's swelling clays is narrower than what standard specifications acknowledge. Combining our excavation monitoring program with a prior grain size analysis helps predict drainage behavior before shoring design even begins.
The window between stable and problematic in Fargo's swelling Lake Agassiz clays is narrower than standard specifications acknowledge—15-minute monitoring intervals become essential.
