Catahoula Formation

Operator-reported tops from 7,802 wells across 30 counties, median tops running 700–6,720 ft by county.

Top depth: 300 ft 4,480 ft

1,920 wells shown (sampled from 7,802)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Refugio	1,671	3,600 ft	3,300–4,100	↓
Victoria	856	3,300 ft	2,440–4,068	↓
Jackson	836	4,261 ft	2,853–4,320	↓
Mcmullen	640	1,590 ft	300–1,590	↓
De Witt	479	700 ft	202–1,450	↓
Goliad	444	2,845 ft	2,292–3,245	↓
Lavaca	404	1,400 ft	200–2,520	↓
Wharton	398	3,270 ft	2,880–4,423	↓
San Patricio	305	4,000 ft	3,084–4,735	↓
Nueces	234	4,030 ft	3,126–4,900	↓
Webb	226	1,500 ft	970–1,500	↓
Bee	202	2,815 ft	1,007–3,250	↓
Waller	193	2,312 ft	2,192–2,462	↓
Colorado	126	2,700 ft	2,100–2,853	↓
Starr	110	2,985 ft	1,170–4,107	↓
Duval	102	1,181 ft	439–3,694	↓
Kenedy	102	4,498 ft	3,346–5,885	↓
Jim Wells	92	3,150 ft	2,124–4,268	↓
Hidalgo	74	4,545 ft	1,468–6,156	↓
Calhoun	65	4,055 ft	2,958–6,193	↓
Brooks	58	3,945 ft	2,450–7,058	↓
Kleberg	45	5,440 ft	3,769–14,050	↓
Fort Bend	30	3,677 ft	3,000–4,600	↓
Polk	29	2,700 ft	1,977–3,154	↓
Jim Hogg	23	2,185 ft	1–4,062	↓
Aransas	20	6,720 ft	5,175–7,902	↓
Matagorda	13	5,120 ft	3,366–5,820	↓
Chambers	9	2,381 ft	2,288–7,406	↓
Brazoria	8	6,080 ft	5,128–6,437	↓
Willacy	8	6,720 ft	5,035–7,935	↓

Counties with fewer than 5 wells omitted. Depths are measured depth as filed; typical range is the 10th–90th percentile of reported tops — raw filings contain occasional typo depths, so extremes are not shown.