Mayer Len
Operator of record for 7 catalogued wells across 3 states. Every well below links to its full registry page.
Filed as: MAYER LEN · MAYER, *LEN · Mayer, Len
At a glance
Mayer Len is the operator of record for 7 catalogued U.S. oil & gas wells in 3 states. None is listed as active, 7 (100%) are plugged & abandoned. Its largest concentration is in Colorado, with 3 wells (43% of its portfolio).
Wells operated
7
Active
0
Plugged
7
Orphaned
0
Portfolio by state
| State | Wells |
|---|---|
| Colorado | 3 |
| Wyoming | 3 |
| Montana | 1 |
Well mix
- Oil wells
- 3
- Gas wells
- 0
- Shut-in
- 0
- Active share
- 0%
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Claim Mayer Len to keep this portfolio accurate — verified operators can correct well statuses and add plugging documentation.
Claim your operator profileWhere does Mayer Len operate?
Mayer Len's catalogued wells are spread across 3 states: Colorado (3), Wyoming (3) and Montana (1). Its 3 Colorado wells are 0.0% of the 124,327 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 Mayer Len’s wells are active, plugged or orphaned?
0% of Mayer Len's catalogued wells are active, 29 percentage points below the national share of 29%. 100% are plugged & abandoned, against 47% nationally. None of the wells filed under this name is flagged as orphaned.
What kinds of wells does Mayer Len operate?
By product class, 3 (43%) 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 Esponda 1 in Johnson, WY at 11,959 ft. The wells listed below sit in Johnson (WY), Campbell (WY), Cheyenne (CO), Kiowa (CO), Logan (CO) and Musselshell (MT). State filings spell the name 3 ways; WellCensus merges exact-normalized spellings only, so subsidiaries and affiliates keep their own pages.
Notable wells operated by Mayer Len
| Well | API # / state ID | Status | Type | Location | Operator | Depth |
|---|---|---|---|---|---|---|
| Esponda 1 | 49-019-20205 | Plugged & abandoned | Oil | Johnson, WY | Mayer Len | 11,959 ft |
| Clabaugh 1 | 49-005-23419 | Plugged & abandoned | Oil | Campbell, WY | Mayer Len | 10,450 ft |
| Biggerstaff Fee 1 | 49-005-27011 | Plugged & abandoned | Oil | Campbell, WY | Mayer Len | 7,358 ft |
| 1 Uprr- Arthur Fritton | 05-017-06033 | Plugged & abandoned | Other type | Cheyenne, CO | Mayer, *len | 5,800 ft |
| 1 Uprr - David Mcbryde | 05-061-06059 | Plugged & abandoned | Other type | Kiowa, CO | Mayer, *len | 5,523 ft |
| 1 Pennington | 05-075-08370 | Plugged & abandoned | Other type | Logan, CO | Mayer, *len | 5,294 ft |
| Harold Hougen 1 | 25-065-21341 | Plugged & abandoned | Other type | Musselshell, MT | Mayer, Len | 4,234 ft |
Deepest first where depth is published. See all 7 wells →
Frequently asked questions
How many wells does Mayer Len operate?
Mayer Len is the operator of record for 7 catalogued oil & gas wells, with the largest concentration in Colorado (3). Only wells in states WellCensus has ingested are counted.
How many of Mayer Len's wells are still active?
0 of Mayer Len's catalogued wells are active; 7 are plugged & abandoned.
In which states does Mayer Len operate wells?
Mayer Len is the operator of record for wells in Colorado (3), Wyoming (3) and Montana (1).
Does Mayer Len operate mostly oil or gas wells?
3 of Mayer Len's catalogued wells are oil wells and 0 are gas wells; the rest are injection, service or unclassified wells.
What is Mayer Len's deepest well?
Among wells with a published depth, Esponda 1 in Johnson, WY is the deepest at 11,959 ft.
Where Mayer Len'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, “Mayer Len — well portfolio”, https://wellcensus.com/operators/mayer-len-6104 (data as of October 10, 2026).
Dataset updated . Operator portfolios are resolved from raw state registry filings (exact-normalized names; subsidiaries stay separate).