Texas well grid 66-20
A 7.5-minute quadrangle of the Texas state well grid, mostly in Colorado County. 381 reports, median depth 165 ft.
381Reports
165 ftMedian depth
62 ftWater at
45 gpmMedian yield
What you will drill through in grid 66-20
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Topsoil 66, Top Soil 60, Sand 45, Sand & Gravel 43, Red Clay 42, Top-Soil 33 |
| 25–50 ft | Sand 40, Red Clay 21, White Clay 20, Gravel 20, Sand & Gravel 20, Tan Clay 16 |
| 50–100 ft | Sand 84, Rock 33, Tan Clay 28, White Clay 23, Clay 21, Red Clay 18 |
| 100–200 ft | Sand 97, Rock 66, Tan Clay 41, Clay 31, Sand & Rock 33, White Clay 22 |
| 200–300 ft | Sand 47, Rock 31, Clay 14, Tan Clay 9, White Clay 8, Sand & Rock 8 |
| 300–500 ft | Clay 7, Sand 4, Shale 3, Gray Clay 2, Sand & Rocks 2, Hard Blue Shale 1 |
| 500–1000 ft | Hard Shale 1, Shale 2, Rock & Sand Streaks 1, Hard Rock & Lignite 1, Shale & Rock 1, Coarse Gray Sand With Some Shale Streaks 1 |
Who drills here
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 257 | 67.5% | 169 |
| Monitor | 37 | 9.7% | 35 |
| Stock | 22 | 5.8% | 170 |
| Rig Supply | 14 | 3.7% | 320 |
| Industrial | 12 | 3.1% | 158 |
| Environmental Soil Boring | 11 | 2.9% | 15 |
| Public Supply | 9 | 2.4% | 350 |
| Irrigation | 9 | 2.4% | 260 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 121 | 165 | 58 |
| 2010s | 140 | 160 | 66 |
| 2020s | 120 | 165 | 63 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 165278 | 2008 | 2,098 | 78 | — | Domestic |
| 191940 | 2007 | 1,030 | 51 | 413 | Public Supply |
| 448247 | 2017 | 750 | 50 | 100 | Rig Supply |
| 327108 | 2012 | 525 | 86 | 150 | Public Supply |
| 318311 | 2012 | 525 | 66 | 465 | Public Supply |
| 726457 | 2026 | 401 | 71 | 65 | Domestic |
| 236802 | 2010 | 380 | — | — | Rig Supply |
| 217364 | 2010 | 380 | — | — | Rig Supply |
| 645162 | 2023 | 350 | 48 | 70 | Domestic |
| 642963 | 2023 | 350 | 45 | 75 | 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 66-20?
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.