Foundation Repair & House Leveling in Hidalgo, TX.

Hidalgo sits on the Rio Grande's active floodplain, mapped largely as the Matamoros and Camargo silty clay series with pockets of Rio Grande silt loam closer to the river.

These are recent (Holocene) alluvial deposits — fine-textured, smectite-rich, with PI in the 30–50 range and a seasonal high water table that can reach within 3 ft of the surface during wet years.

Because the river recharges the shallow aquifer year-round, moisture under slabs near the bridge and the old pumphouse never fully equilibrates: the top 3–4 ft of soil cycles wet/dry with rainfall while the deeper profile stays saturated.

That vertical moisture gradient produces edge-lift along perimeter beams and center-doming in interior slabs — the classic 'dish' pattern we see in older Hidalgo homes.

Pore-water chemistry also carries chlorides from upstream irrigation return flow, which is why we drive reinforced concrete piers past the active zone (typically 8–12 ft) to load-bearing strata rather than relying on shallow steel that would sit in the corrosive saturated layer.