Mcmahon Cl
Operator of record for 7 catalogued wells across 1 state. Every well below links to its full registry page.
Filed as: McMahon, C. L. Inc. · McMahon, C. L., Inc.
At a glance
Mcmahon Cl is the operator of record for 7 catalogued U.S. oil & gas wells in 1 state. None is listed as active, 6 (86%) are plugged & abandoned. Its largest concentration is in Illinois, with 7 wells (100% of its portfolio).
Wells operated
7
Active
0
Plugged
6
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Illinois | 7 |
Well mix
- Oil wells
- 4
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 0%
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Claim Mcmahon Cl to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Mcmahon Cl operate?
Mcmahon Cl's catalogued wells are spread across 1 state: Illinois (7). Its 7 Illinois wells are 0.0% of the 174,478 catalogued in that state — its largest share of any state. Counts cover only states whose registries WellCensus has ingested with operator names; wells in Nebraska and Texas (location indexes) and in states without a registry ingest are not yet attributed to any operator.
How many of Mcmahon Cl’s wells are active, plugged or orphaned?
0% of Mcmahon Cl's catalogued wells are active, 29 percentage points below the national share of 29%. 86% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Mcmahon Cl operate?
By product class, 4 (57%) are oil wells and 0 (0%) gas wells; nationally the shares are 43% and 17%. The deepest of its wells with a published depth is McGill R R 1 in Hamilton, IL at 3,237 ft. The wells listed below sit in Hamilton (IL), White (IL) and Clark (IL). State filings spell the name 2 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Mcmahon Cl
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| McGill R R 1 | 12-065-02558 | Plugged & abandoned | Oil | Hamilton, IL | McMahon, C. L. Inc. | 3,237 ft |
| Barbre Frank 1 | 12-193-02575 | Plugged & abandoned | Other type | White, IL | McMahon, C. L. Inc. | 2,936 ft |
| Thompson A D 1 | 12-193-05833 | Plugged & abandoned | Other type | White, IL | McMahon, C. L., Inc. | 2,865 ft |
| Lamb, Oveta 2 | 12-023-02616 | Plugged & abandoned | Oil | Clark, IL | McMahon, C. L., Inc. | 1,700 ft |
| Grant, H.M. 1 | 12-023-00408 | Plugged & abandoned | Other type | Clark, IL | McMahon, C. L. Inc. | 567 ft |
| Smith, Emma 30 | 12-023-02533 | Plugged & abandoned | Oil | Clark, IL | McMahon, C. L., Inc. | 563 ft |
| McFarland, O. 1 | 12-023-00676 | Other status | Oil | Clark, IL | McMahon, C. L., Inc. | 412 ft |
Deepest first where depth is published. See all 7 wells →
Frequently asked questions
How many wells does Mcmahon Cl operate?
Mcmahon Cl is the operator of record for 7 catalogued oil & gas wells, with the largest concentration in Illinois (7). Only wells in states WellCensus has ingested are counted.
How many of Mcmahon Cl's wells are still active?
0 of Mcmahon Cl's catalogued wells are active; 6 are plugged & abandoned.
In which states does Mcmahon Cl operate wells?
Mcmahon Cl is the operator of record for wells in Illinois (7).
Does Mcmahon Cl operate mostly oil or gas wells?
4 of Mcmahon Cl's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Mcmahon Cl's deepest well?
Among wells with a published depth, McGill R R 1 in Hamilton, IL is the deepest at 3,237 ft.
Where Mcmahon Cl's wells are
About this data
Source: State oil & gas regulator registries (operator of record as filed, exact-normalized across states) plus the USGS United States Documented Orphaned Well Database (2026), as published October 10, 2026 — WellCensus refreshes it monthly. See the methodology for how records are matched, cleaned and scored.
Cite as: WellCensus, “Mcmahon Cl — well portfolio”, https://wellcensus.com/operators/mcmahon-cl-66093 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).