Cotton Valley Formation

Operator-reported tops from 14,984 wells across 30 counties, median tops running 4,727–13,879 ft by county.

Top depth: 7,843 ft 12,712 ft

2,001 wells shown (sampled from 14,984)

Depth by County

County	Wells	Median Top	Typical Range	CSV
Panola	4,733	8,330 ft	8,070–8,816	↓
Harrison	2,290	8,538 ft	7,944–9,349	↓
Freestone	2,109	11,047 ft	10,232–12,720	↓
Rusk	1,659	9,304 ft	8,794–10,356	↓
Limestone	830	10,602 ft	9,102–13,144	↓
Robertson	589	12,170 ft	9,968–13,821	↓
Gregg	509	9,200 ft	8,866–10,630	↓
Upshur	429	9,980 ft	9,250–11,631	↓
Smith	293	10,324 ft	9,769–11,278	↓
Leon	256	13,228 ft	11,943–14,900	↓
Nacogdoches	225	11,180 ft	9,897–12,011	↓
Shelby	213	9,768 ft	8,642–10,944	↓
Cass	184	9,225 ft	8,500–10,484	↓
Henderson	114	10,316 ft	9,136–10,673	↓
Marion	82	9,150 ft	8,160–11,890	↓
Red River	80	4,727 ft	4,605–5,322	↓
San Augustine	75	11,664 ft	11,244–13,099	↓
Cherokee	63	10,620 ft	10,263–11,725	↓
Angelina	39	13,879 ft	13,526–14,384	↓
Navarro	39	9,380 ft	8,312–10,526	↓
Franklin	37	9,621 ft	9,240–11,269	↓
Wood	29	11,574 ft	9,508–12,487	↓
Anderson	21	10,038 ft	9,795–13,424	↓
Van Zandt	19	10,250 ft	9,647–12,199	↓
Morris	17	10,251 ft	9,842–11,933	↓
Rains	15	10,065 ft	9,552–12,211	↓
Sabine	11	11,018 ft	10,817–11,193	↓
Bowie	11	6,252 ft	6,142–7,158	↓
Hopkins	8	9,865 ft	7,320–11,660	↓
Camp	5	11,381 ft	10,546–11,549	↓

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.