Texas well grid 66-12
A 7.5-minute quadrangle of the Texas state well grid, mostly in Colorado County and Fayette County. 434 reports, median depth 170 ft.
434Reports
170 ftMedian depth
85 ftWater at
38 gpmMedian yield
What you will drill through in grid 66-12
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Top Soil 65, Sand 53, Clay 45, Yellow Clay 50, Topsoil 44, Top-Soil 42 |
| 25–50 ft | Tan Clay 40, Sand 32, Sand & Rock 16, Rock 13, Tan & White Clay 14, Clay & Rock 9 |
| 50–100 ft | Sand 73, Rock 45, Tan Clay 34, Sand & Rock 31, Clay 21, Clay & Rock 18 |
| 100–200 ft | Sand 107, Rock 69, Tan Clay 63, Clay 38, Sand & Rock 41, Sand & Rock Streaks 14 |
| 200–300 ft | Sand 52, Clay 21, Shale 13, Rock 15, Gray Clay 5, Sand & Rock 7 |
| 300–500 ft | Sand 32, Shale 13, Clay 14, Sand & Rock 6, Rock 9, Clay & Rock 4 |
| 500–1000 ft | Shale 4, Sand 6, Sand & Rock 4, Shale & Rock 3, Clay 5, Shale & Clay 2 |
| 1000–5000 ft | Shale 1, Hard Clay 1 |
Who drills here
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Domestic | 311 | 71.7% | 170 |
| Stock | 38 | 8.8% | 150 |
| Irrigation | 30 | 6.9% | 490 |
| Monitor | 22 | 5.1% | 25 |
| Other | 14 | 3.2% | 165 |
| Rig Supply | 13 | 3.0% | 280 |
| Public Supply | 4 | 0.9% | 370 |
| Closed-Loop Geothermal | 1 | 0.2% | 300 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 141 | 152 | 80 |
| 2010s | 149 | 185 | 83 |
| 2020s | 144 | 180 | 93 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 594213 | 2021 | 1,090 | 120 | 140 | Irrigation |
| 604929 | 2022 | 1,030 | 123 | 150 | Irrigation |
| 707358 | 2025 | 1,010 | 130 | 145 | Other |
| 391244 | 2015 | 1,010 | 170 | 170 | Irrigation |
| 390913 | 2015 | 1,010 | 60 | 200 | Irrigation |
| 516865 | 2019 | 1,000 | 34 | 150 | Irrigation |
| 634279 | 2023 | 575 | 185 | — | Public Supply |
| 393895 | 2015 | 570 | 110 | 120 | Irrigation |
| 644657 | 2023 | 550 | 210 | 130 | Irrigation |
| 504994 | 2019 | 550 | 160 | 100 | Stock |
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 66-12?
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, Fayette County.