HIERHOLZER RETZLOFF-MCMAHON SA3
RRC oil lease 21723, district 01 · EAGLEVILLE (EAGLE FORD-1) field · Atascosa County · operated by MARATHON OIL EF LLC
HIERHOLZER RETZLOFF-MCMAHON SA3 at a glance
Oil output in Mar 2026–May 2026 was down 74% from the same three months a year earlier. Over the last 12 months it reported 164,866 BBL of oil and 262,157 MCF of gas. In May 2026, the latest month not marked provisional, it reported 10,919 BBL and 14,701 MCF.
Royalty = (10,919 BBL × $97.31 WTI, Sep 2026, EIA + 14,701 MCF × $2.95 Henry Hub, Sep 2026, EIA) × your decimal. 0.001 is only a placeholder: enter the decimal from your check stub or division order. Gross, before taxes and deductions. Full estimator →
Oil + condensate (BBL per month, last 36 months)
Gas (MCF per month, last 36 months)
Jun 2026 and Jul 2026 are provisional (lighter bars) and usually rise as late reports arrive.
HIERHOLZER RETZLOFF-MCMAHON SA3 production history in brief
By oil-equivalent volume over the last 12 months, HIERHOLZER RETZLOFF-MCMAHON SA3 ranks #20 of 1,245 reporting leases in Atascosa County. It reported production in 15 of the 34 non-provisional months shown, starting in our window in Mar 2025. Its peak oil month in that window was Mar 2025 at 45,413 BBL. The lease is in the EAGLEVILLE (EAGLE FORD-1) field and is operated by MARATHON OIL EF LLC; production is reported for the lease as a whole, not per well.
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New permits nearby
No new permits in this county in the current RRC daily file.
Monthly production
| Month | Oil (BBL) | Gas (MCF) |
|---|---|---|
| Jul 2026 (provisional) | 10,593 | 14,198 |
| Jun 2026 (provisional) | 11,897 | 18,653 |
| May 2026 | 10,919 | 14,701 |
| Apr 2026 | 9,535 | 15,479 |
| Mar 2026 | 9,922 | 22,124 |
| Feb 2026 | 9,621 | 15,911 |
| Jan 2026 | 11,986 | 19,226 |
| Dec 2025 | 13,412 | 25,167 |
| Nov 2025 | 17,855 | 26,612 |
| Oct 2025 | 18,622 | 28,194 |
| Sep 2025 | 18,248 | 28,673 |
| Aug 2025 | 22,256 | 33,219 |
| Jul 2025 | 23,149 | 29,184 |
| Jun 2025 | 24,037 | 25,737 |
| May 2025 | 32,797 | 33,556 |
| Apr 2025 | 39,210 | 40,014 |
| Mar 2025 | 45,413 | 39,523 |
Check these figures in the RRC Production Data Query (Specific Lease Query: district 01, lease 21723). Production is reported per lease, so a lease with several wells is not split by well.
Source: Texas Railroad Commission (data sets, Production Data Query). Data date: RRC Production Data Query dump, extract dated Sep 18, 2026; production through Jul 2026. Jun 2026 and Jul 2026 are provisional: operators file late and amend, so these months usually rise in later releases. Oil = crude oil + condensate (BBL); gas = gas-well gas + casinghead gas (MCF), as reported to RRC. Methodology.