A drilled shaft goes where a spread footing cannot. We bore a round hole to the depth the engineer calls for, set a reinforcing cage, and fill it with concrete so the load is carried by deeper, firmer ground or by friction along the shaft. In Natrona County that approach comes up when surface soils are weak, when frost depth is a concern, when loads are concentrated, or when a building has to resist uplift from wind.
Ground here is varied. Casper Mountain rises to 8,130 feet at the north end of the Laramie Mountains, with an anticline and a fault line on its north side, and the Wind River Formation shows up in the eroded ravines at Hell's Half Acre about 40 miles west along US 20/26. Out on the Salt Creek Oil Field, a 2016 CO2 leak from an abandoned well reminded everyone that old wells and deep ground are not something to guess about. Pier design starts with a geotechnical report, and we do not drill without one. Where shallow footings make more sense, the concrete foundations trade partner builds those instead.
Our job is to turn a stamped pier schedule into holes that are plumb, clean, to depth and ready for concrete. That means equipment selection, casing when the hole will not stand open, groundwater control, cage placement and a pour method that keeps the concrete from segregating. Each step has a record, and the engineer or special inspector signs off before concrete goes in.
Piers make sense when the soil near the surface is soft, loose or variable, or when the bearing layer is deep enough that wide footings would cost more than shafts. They also help where frost can lift lightweight structures, where equipment loads or crane loads concentrate in a small footprint, and where wind uplift requires a deeper hold. On a hillside, the reach into stable ground can matter more than the width of a footing.
Some owners prefer shafts for speed. A rig can drill and pour dozens of piers while a crew for footings is still forming. On a metal building with light, spread-out column loads, spread footings are usually cheaper. On a building with heavy crane loads or an aircraft hangar door that catches a lot of wind, piers often win. We run both options in our estimates and let the numbers decide.
We read the soils report before we choose equipment, and we walk the site to see access, overhead lines and how a rig will move. We confirm utility locations before the first bite and plan for spoil handling, because cuttings from a hole can fill a lot of yard space fast. If the ground is wet or runs, we case it and tell the owner what the extra time and cost looks like.
When the drilled depth reaches groundwater or a caving layer, we do not push through and hope. We stop, call the engineer and agree on casing, slurry or a revised depth. That discipline is slower for an afternoon and cheaper for the life of the building. A shaft that is poured in a hole full of loose material is a shaft nobody can certify.
The City of Casper lists seismic design category B and a 3 foot frost line to top of footing, and it directs snow load to the 2024 International Building Code and the ASCE Hazard Tool. Shaft design sits inside those criteria, and plan review for commercial permits covers structural calculations, engineering reports and specifications. The engineer of record owns the pier design. We own the quality of the hole and the pour.
Wyoming does not have a single statewide building code, so criteria can change at a county line. We ask which jurisdiction reviews the project, which edition it is enforcing and whether it requires special inspection of drilled shafts. A special inspector is typically on site during drilling and placement, and we schedule rigs and concrete deliveries so that inspector is never waiting.
Pier cost is driven by diameter, depth and the number of shafts, plus casing, dewatering, rebar tonnage, concrete volume and rig mobilization. A few large shafts in poor ground can cost more than many small ones in good ground. Haul-off of cuttings and the condition of the access road also add to the number.
Owners reduce risk by paying for good geotechnical work early. A boring at each column line costs far less than a rig stuck on a boulder or a hole that will not hold water. Our preconstruction estimating work sets allowances for unknowns and shows what each depth change would do to cost, and we apply the same approach to structural steel erection where column loads drive the shaft design.
We plan the sequence so the rig works away from the crew behind it. Layout, drilling, cage placement and concrete follow in one continuous flow, and caps or grade beams start as soon as shaft concrete is strong enough. The ready-mix plant and the pour pump are booked ahead because a shaft cannot sit open overnight in a rainstorm.
Cold weather affects the pour, not the drilling. Wind and freezing temperatures call for protection on the top of the shaft and the cap, and the same Casper Mountain gusts that slow crane work also slow pump trucks. For industrial owners in the manufacturing sector, we line up shaft work with equipment delivery dates so a late rig does not become a late line start.
Send us the geotechnical report, the pier schedule and the date you need caps poured. We will review access, groundwater and sequence and tell you what the shaft scope looks like. Use the quote form or call us.
The geotechnical engineer makes that call from borings, lab testing and the building loads. If the report shows weak or variable soil at footing depth, or calls for deep bearing, piers come up. We help compare drilled shafts against deeper footings or helical systems on cost and schedule.
A typical shaft can be drilled and poured in a day, depending on diameter, depth and ground conditions. The overall schedule depends on rig availability, shaft count and access. We provide a day-by-day plan with the proposal and update it after the first few shafts show how the ground behaves.
We stop and call the engineer. Options include temporary casing, drilling slurry, pumping or changing depth, and each has cost and schedule effects. The decision belongs to the engineer, and we document the condition and the change.
Yes. Out near Salt Creek, abandoned wells and buried lines are a real concern, and the 2016 CO2 leak from an abandoned well at the field shows what can go wrong. We ask owners for well and pipeline maps, locate everything before we drill and stop work if anything unexpected appears.
Drilling can continue in cold weather if the ground is not frozen too deeply, but the concrete pour needs protection. We use heated materials and insulation, and we price it separately. For large projects it is often smarter to drill in winter and pour as the weather allows.