Texas well grid 77-08
A 7.5-minute quadrangle of the Texas state well grid, mostly in Frio County and Kerr County. 273 reports, median depth 25 ft.
273Reports
25 ftMedian depth
40 ftWater at
25 gpmMedian yield
What you will drill through in grid 77-08
| Depth, ft | What was logged there |
|---|---|
| 0–25 ft | Surface 36, Clay 22, Yellow Clay 14, Caliche 12, Gravel 11, Sand 10 |
| 25–50 ft | Shale 8, Blue Shale 6, Sand 6, Gravel 3, Yellow Sand 3, Clay 3 |
| 50–100 ft | Shale 12, Blue Shale 12, Sand 11, Gray Sand 7, Blue Clay 4, Sandy Shale 3 |
| 100–200 ft | Shale 13, Sand 13, Sandy Shale 10, Blue Shale 6, Grey Sand 4, Gray Sand 3 |
| 200–300 ft | Sand 14, Shale 10, Gray Sand 6, Sandy Shale 5, Blue Shale 3, Sandy 2 |
| 300–500 ft | Shale 15, Sand 10, Sandy Shale 6, Blue Shale 4, Gray Sand 4, Clay 4 |
| 500–1000 ft | Sand 12, Shale 11, Sandy Shale 4, Sand, Shale Layers 3, Grey Sand 2, Sand + Shale 2 |
| 1000–5000 ft | Carrizo Sand 6, Sandy Shale 3, Shale 3, Sand 2, Carrizo 2, Hard Blue Shale 1 |
Who drills here
What the wells are for
| Purpose | Wells | Share | Median depth, ft |
|---|---|---|---|
| Environmental Soil Boring | 106 | 38.8% | 10 |
| Monitor | 81 | 29.7% | 25 |
| Domestic | 58 | 21.2% | 160 |
| Stock | 13 | 4.8% | 420 |
| Irrigation | 11 | 4.0% | 1,280 |
| Industrial | 2 | 0.7% | 1,441 |
| Public Supply | 2 | 0.7% | 1,424 |
| Decade | Reports | Median depth, ft | Water at, ft |
|---|---|---|---|
| 2000s | 71 | 80 | 30 |
| 2010s | 145 | 20 | 50 |
| 2020s | 57 | 105 | 172 |
The deepest reports on file
| Report | Year | Depth, ft | Water at, ft | Yield, gpm | Purpose |
|---|---|---|---|---|---|
| 710938 | 2025 | 1,533 | 481 | 1,050 | Irrigation |
| 258781 | 2011 | 1,530 | 400 | 1,200 | Irrigation |
| 639001 | 2022 | 1,487 | 454 | 1,000 | Irrigation |
| 664379 | 2024 | 1,441 | 447 | 600 | Industrial |
| 597263 | 2021 | 1,440 | 301 | 300 | Irrigation |
| 347624 | 2013 | 1,424 | 506 | 598 | Public Supply |
| 295787 | 2012 | 1,396 | 412 | 1,100 | Irrigation |
| 286474 | 2012 | 1,377 | 400 | 300 | Public Supply |
| 710648 | 2023 | 1,280 | 471 | 150 | Irrigation |
| 99643 | 2006 | 1,245 | 428 | 180 | Irrigation |
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 77-08?
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 Frio County, Kerr County.