Hillside lots on sandstone and shale, lake homes on cut and fill pads, and an old railroad town by Bird Creek.
Skiatook calls itself the Gateway to the Osage, and the foundation work out here proves it. Cross the Tulsa County line heading west and the flat clay of the Owasso and Sperry side gives way to hills. Sandstone caps the ridges, shale makes up the slopes, and the lots get steeper toward the lake. Most Skiatook houses we work on share one problem: the two ends are sitting on two different kinds of ground.
We cover all of Skiatook on both sides of the county line. That's the original townsite around the Highway 11 and Highway 20 junction, where the Midland Valley Railroad laid out the town in 1905 and the older pier and beam houses still sit along the numbered streets. It's the 1970s and 1980s neighborhoods like Meadow Crest and Westwood Estates, the newer builds around Orchard Estates, Breton Ridge, and the Blue Bird streets on the south side, and the lots going in along 154th Street North. Out toward the lake we work Cross Oaks, The Estates at Crosstimbers, Big Bend Estates on the bluff above Bird Creek, and the acreage off the county roads toward the dam.
The ground west of town is interbedded shale, siltstone, and sandstone. The thick sandstone beds are hard and they hold up the ridge tops. The shale is soft and weathers into clay on the slopes. A USGS study near the lake found bedrock weathered 30 to 80 feet deep under the ridges, so what looks like rock on the surface can be rotten and crumbly a few feet down. That's the layer a lot of Skiatook slabs are sitting on.
Shale clay does what clay does everywhere in the Tulsa area. It swells when the spring storms come through and shrinks when we hit 100 degrees for three weeks in August. The sandstone next to it doesn't move at all. Put a house across the boundary and you get differential settlement every year. The 2022 and 2024 summers were dry enough that we had calls from hillside lots that had been fine for 30 years. Our post on why settling gets worse after drought years explains why the damage shows up late.
Down low it's a different problem. Bird Creek floods in heavy rain, and the bottomland soil along it is deep, wet, and slow to drain. Houses down there don't tilt as much as they rot. East of the county line toward Sperry the ground flattens into the heavier clay you'll find all over the north side of the metro.
The old town is pier and beam on brick or stacked sandstone piers with shallow crawl spaces. The 1970s and 1980s neighborhoods are early slab on grade with grade beams that don't reach past the active soil. The lake and hillside homes are mostly custom slabs poured on a pad cut into the hill, with the downhill side built up on fill. The uphill end sits on weathered rock and the downhill end sits on whatever got pushed over the edge. If that fill wasn't compacted in lifts, it settles, and the house follows it.
Downhill corner settlement on hillside lots around the lake, usually a diagonal crack from a window corner and a door that won't latch on the low side. Crawl space water and rotted sills in the older homes near Bird Creek. Sunken driveways poured over loose fill on sloped lots. And slab edge drops in the 1980s neighborhoods after the 2024 dry summer, where post oaks within 15 feet of the house pulled the moisture out of the shale clay.
Hillside lots are where helical piers earn their keep. They screw through the fill on the downhill side to a measured torque in the native shale or seat on the sandstone, and the depth can change from one pier to the next. On the ridge tops where sandstone is close, push piers hit refusal fast. Old town pier and beam homes get jacked level and reshimmed, with new pads where the sandstone piers have tipped, plus crawl space encapsulation on anything near the creek. Driveways, patios, and garage floors get polyurethane foam leveling. If drainage on a sloped lot is driving the problem, read our post on drainage fixes that prevent foundation damage.
Skiatook jobs typically run inside the same range as the rest of the Tulsa metro:
We give written quotes after a free inspection. No phone estimates.
Because the two sides of the house are sitting on different ground. On a sloped lot the uphill side is usually cut into weathered sandstone or shale and the downhill side is sitting on fill the builder pushed out to make a flat pad. The fill settles, the rock doesn't, and the house tilts toward the low side. Piers on the downhill side that reach solid ground stop it.
Yes. West of town the ground is interbedded sandstone, siltstone, and shale with thin rocky soil on the ridges and shale clay on the slopes. East toward Sperry and Owasso it flattens out into deeper clay. The county line roughly marks where rock problems turn into clay problems.
The lake itself isn't the issue. The lots around it are steep, rocky, and wooded, and most of the homes out there are custom builds on cut and fill pads with big post oaks close to the house. Fill settlement on the downhill side and tree roots drying out the soil are what we fix out there.
The low ground along Bird Creek floods in heavy rain, and the older pier and beam homes down there take on crawl space water every spring. Rotted sills, sagging joists, and tilted piers are the usual findings. We relevel the house and encapsulate the crawl space so it stays dry.
We don't need to. The sandstone under the ridges is the solid ground we're trying to reach. Push piers drive down and seat on it. On the shale slopes we use helical piers that screw to a measured torque. Either way the house ends up carried by something that doesn't move.
Other locations: Collinsville | Owasso | Claremore
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