Texas well grid 66-23
A 7.5-minute quadrangle of the Texas state well grid, mostly in Austin County and Colorado County. 269 reports, median depth 170 ft.
269Reports
170 ftMedian depth
50 ftWater at
50 gpmMedian yield
What you will drill through in grid 66-23
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Clay 68, Top Soil 57, Red Clay 39, Yellow Clay 26, Sand 23, Topsoil 16 |
| 25–50 ft | Sand 55, Clay 13, Tan Clay 9, Red Clay 7, Brown/Tan Clay 6, Rock 6 |
| 50–100 ft | Sand 77, Clay 29, Rock 17, Sandstone 14, Clay & Rock 9, Tan Clay 7 |
| 100–200 ft | Sand 91, Clay 45, Rock 49, Tan Clay 26, White Clay 13, Sand & Rock 6 |
| 200–300 ft | Sand 48, Clay 20, Sandstone 14, Rock & Sand 7, Rock 6, Tan Clay 6 |
| 300–500 ft | Clay 6, Tan Clay 3, Sand 3, Rock 2, Blue Clay 1, Solid Rock 1 |
Who drills here
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 228 | 84.8% | 165 |
| Rig Supply | 17 | 6.3% | 220 |
| Stock | 8 | 3.0% | 213 |
| Industrial | 8 | 3.0% | 200 |
| Irrigation | 3 | 1.1% | 330 |
| Monitor | 3 | 1.1% | 25 |
| Public Supply | 2 | 0.7% | 435 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 80 | 173 | 45 |
| 2010s | 52 | 185 | 45 |
| 2020s | 137 | 165 | 56 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 58692 | 2005 | 435 | 70 | 70 | Public Supply |
| 5442 | 2001 | 430 | 80 | 100 | Domestic |
| 180868 | 2009 | 400 | 35 | — | Irrigation |
| 346894 | 2013 | 330 | — | 600 | Irrigation |
| 676680 | 2024 | 315 | 71 | 70 | Domestic |
| 654660 | 2023 | 315 | 73 | 60 | Domestic |
| 698136 | 2025 | 310 | 84 | 50 | Domestic |
| 686952 | 2025 | 310 | 70 | 45 | Domestic |
| 682632 | 2024 | 310 | 70 | 50 | Domestic |
| 679457 | 2024 | 310 | 70 | 50 | Domestic |
Every figure here comes from a report a licensed driller filed on the day the work ended — sometimes decades ago. It describes what was found then, not what a well yields today, and it is not a statement that any well is sound, potable or still in use.
Drilling a well near grid 66-23?
Depth is only half the quote. What it costs depends on the rock, the casing and the pump. Tell us where and we pass the request to licensed Texas drillers.
We are nobody's agent and have no arrangement with any firm today. What we do with this.
This grid falls in Austin County, Colorado County, Harris County, Fort Bend County, Wharton County.