Texas well grid 66-21
A 7.5-minute quadrangle of the Texas state well grid, mostly in Colorado County. 312 reports, median depth 148 ft.
312Reports
148 ftMedian depth
60 ftWater at
50 gpmMedian yield
What you will drill through in grid 66-21
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Topsoil 62, Top Soil 48, Sand 43, Top-Soil 42, Red Clay 39, Clay 34 |
| 25–50 ft | Sand 69, White Clay 18, Red Clay 15, Clay 11, Tan & White Clay 13, Gravel 11 |
| 50–100 ft | Sand 104, White Clay 47, Clay 17, Red Clay 18, Rock 17, Red & White Clay 10 |
| 100–200 ft | Sand 127, White Clay 54, Rock 51, Tan Clay 34, Clay 23, Red Clay 15 |
| 200–300 ft | Sand 14, Tan Clay 7, Clay 5, Rock 6, Sand & Rock 3, Shale 2 |
| 300–500 ft | Sand 8, Clay 2, Sand & Rock Strks 1, Yellow & Brown Clay 1, Rock 2, Sand & Rock Streaked 1 |
| 500–1000 ft | Clay 2, Sand 2, Sand And Shale Seam 1, Shale 1 |
Who drills here
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 258 | 82.7% | 145 |
| Stock | 21 | 6.7% | 165 |
| Industrial | 8 | 2.6% | 325 |
| Rig Supply | 8 | 2.6% | 180 |
| Irrigation | 8 | 2.6% | 380 |
| Other | 6 | 1.9% | 275 |
| Public Supply | 3 | 1.0% | 300 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 94 | 146 | 57 |
| 2010s | 95 | 155 | 62 |
| 2020s | 123 | 145 | 58 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 64860 | 2005 | 1,183 | 106 | — | Domestic |
| 61683 | 2003 | 607 | 28 | 200 | Public Supply |
| 433040 | 2016 | 560 | 42 | 2,000 | Irrigation |
| 380097 | 2014 | 450 | 80 | 70 | Irrigation |
| 315694 | 2013 | 430 | 40 | 216 | Industrial |
| 534019 | 2020 | 385 | 19 | 1,500 | Other |
| 486044 | 2018 | 380 | 85 | 810 | Irrigation |
| 238929 | 2006 | 371 | 55 | — | Domestic |
| 707543 | 2025 | 360 | 113 | — | Domestic |
| 333644 | 2011 | 350 | 110 | 40 | 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 66-21?
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 Colorado County.