TLS Foundations · New Mexico
Most states have one soil story.
New Mexico has thirteen.
Every call we take starts with location. The geology under a home in Farmington is fundamentally different from the geology under a home in Albuquerque or Roswell. This is what we're thinking before we ever show up.
Find your region
New Mexico sits at the intersection of the Rio Grande Rift, the Colorado Plateau, the Great Plains, and the Basin and Range Province. No other state concentrates this many distinct geological systems in a single border. What that means for foundations is that the call we get from Farmington and the call we get from Albuquerque are different problems before we've asked a single question.
What follows is what we're working through on our end before we ever pull up in front of your house.
Albuquerque Basin
Albuquerque · Rio Rancho · Bernalillo · Corrales · Los Lunas
The Albuquerque Basin is the deepest sediment-filled rift valley in New Mexico — bedrock lies anywhere from 30 feet below surface in some East Mountain foothill areas to over 14,000 feet beneath downtown. That number matters because it means we're always working in sediments, not rock, and those sediments were deposited under very different conditions depending on where in the basin you are.
The Rio Grande laid down the valley floor alluvium over millions of years, but the West Mesa west of the river was shaped primarily by wind. Rio Rancho, Corrales, and the North Valley each sit on different deposit types from one neighborhood to the next — sometimes from one end of a street to the other.
The Huning Ranch neighborhood in Los Lunas is built over one of the deepest collapsible soil profiles documented in the state. Push piers installed to 60 feet lifted the structure before getting to depth, the mechanism was skin friction not end bearing — the load had never reached competent material. Helical piers found actual bearing. This is not an unusual story here.
Soil conditions we encounter
What this means when we come out
- We ask about landscaping changes, irrigation, and when problems first appeared — moisture history matters here more than in most basins
- Address alone tells us a lot: North Valley, West Mesa, and Four Hills each suggest different starting hypotheses
- Pier depth is not determined by street address — it's determined by what we find in the ground at that specific location
- We don't assume fill depth or compaction based on neighboring properties
Every home in this basin deserves its own story. The basin context explains why variability exists; site-specific investigation determines the approach.
NMDOT / published references
- Algodones collapsible soils documented by NMDOT, 1982 highway survey
- NMBGMR: Quaternary geology of the Albuquerque area (Connell et al.)
- USGS Open-File Report: Rio Grande rift sediment fill depth surveys
- ABCWUA hydrogeologic mapping: Four Hills area / Tijeras Arroyo corridor
San Juan Basin
Farmington · Aztec · Bloomfield · Gallup · Shiprock
The San Juan Basin is dominated by the Mancos Shale — a marine deposit laid down when a shallow inland sea covered this region roughly 90 million years ago. That shale is loaded with smectite clay minerals, which means the soil behavior here is essentially the opposite of what we encounter in most of the rest of New Mexico.
Where Albuquerque soils often collapse when wetted, San Juan Basin soils swell. The Mancos Shale and the soils derived from its weathering can exert uplift forces strong enough to lift slabs, crack foundations, and buckle basement walls — all without any loading from above. The damage here isn't from the house pushing down; it's from the ground pushing up.
Shiprock itself — the volcanic plug visible from 50 miles — is a useful reminder that this basin has seen more geologic drama than it appears. The surrounding plain is made of Mancos Shale badlands. The dikes radiating from Shiprock cut through formations that control where water moves and where it doesn't.
Soil conditions we encounter
What this means when we come out
- We're looking for heave indicators, not just settlement — cracks that open in spring and close in fall are a different story than cracks that progressively widen
- Irrigation and drainage management often matters as much as structural repair in this basin
- Helical piers into competent bearing below the active zone are typically required — shallow footings rarely solve Mancos Shale problems
- We ask about mine maps for older structures in coal measure areas before recommending any approach
San Juan Basin problems are almost always ongoing if moisture isn't managed. Repair without addressing drainage is a temporary solution here.
Published references
- NMBGMR: Mancos Shale distribution, San Juan Basin geologic map
- USGS Professional Paper: San Juan Basin structure and stratigraphy
- USGS Geologic Map: Navajo Volcanic Field (Shiprock dike system)
- NM Coal Mine Mapping Authority: abandoned mine records, San Juan County
Basin context is where we start. Your site is where we finish.
Everything above describes what we bring to the conversation when you call. What we find under your specific house — at your specific address, with your specific construction history — is what actually determines the path forward.
Talk to us about your situation