CLIFF Field Activity and Well Summary

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Total wells

46
CLIFF field

Drill activity

—
drill dates not in our copy of this source

The CLIFF oil & gas field in Colorado contains 46 wells on file.

Top operators: MONAHAN* REX FAMILY TRUST, SINCLAIR OIL & GAS COMPANY, and others.

Most recent well: UPRR-AYRES, operated by ROUNDS CO* DON M — last updated March 2026.

CLIFF field coverage

Counties the CLIFF field intersects.

Saguache CountySedgwick CountyCheyenne CountyCuster CountyLa Plata CountySan Juan CountyPitkin CountyPark CountyAlamosa CountyProwers CountyMoffat CountyJefferson CountySummit CountyPueblo CountyBoulder CountyDenver CountyMontrose CountyEagle CountySan Miguel CountyCostilla CountyBroomfield CountyChaffee CountyCrowley CountyFremont CountyHuerfano CountyDelta CountyGarfield CountyRio Blanco CountyMorgan CountyLincoln CountyMontezuma CountyAdams CountyMineral CountyOtero CountyPhillips CountyOuray CountyBent CountyArchuleta CountyRoutt CountyHinsdale CountyWeld CountyLarimer CountyLake CountyRio Grande CountyGilpin CountyYuma CountyJackson CountyKit Carson CountyClear Creek CountyLogan — 46 wellsWashington CountyDouglas CountyConejos CountyEl Paso CountyKiowa CountyTeller CountyGunnison CountyBaca CountyElbert CountyMesa CountyDolores CountyArapahoe CountyLas Animas CountyGrand County
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Recent wells

Well Name County Last activity Updates Operator API
UPRR-AYRES Logan 2026-03-18 ROUNDS CO* DON M 05-075-07258
UPRR-CASEMENT Logan 2026-03-18 T & T OIL COMPANY, UPRR, ET AL 05-075-07205
CASEMENT 'C' Logan 2026-03-18 BRITISH AMERICAN OIL PROD CO 05-075-07215
H.S. AYRES Logan 2026-03-18 SINCLAIR OIL & GAS COMPANY 05-075-07245
AYRES Logan 2026-03-18 EXETER DRILLING CO 05-075-07313
HISCOCK Logan 2026-03-18 UNION TEXAS PETROLEUM 05-075-07219
UPRR-AYRES Logan 2026-03-18 ROUNDS CO* DON M 05-075-07244
RICE Logan 2026-03-18 ANDERSON-PRICHARD OIL CORP 05-075-07230
L HISCOCK Logan 2026-03-18 SINCLAIR OIL & GAS COMPANY 05-075-07220
CASEMENT 'A' Logan 2026-03-18 BRITISH AMERICAN OIL PROD CO 05-075-07206

Top Operators in the CLIFF field by total wells

MONAHAN* REX FAMILY TRUST7SINCLAIR OIL & GAS COMPANY7BRITISH AMERICAN OIL PROD CO6ROUNDS CO* DON M6MCCARTNEY ENGINEERING LLC3BROWN OIL & GAS LLC3UNION TEXAS PETROLEUM2ANDERSON-PRICHARD OIL CORP2SNOWDEN OIL CO1T & T OIL COMPANY, UPRR, ET AL1

Operators: Monahan* Rex Family Trust, Sinclair Oil & Gas Company, British American Oil Prod Co, Rounds Co* Don M, Mccartney Engineering Llc, Brown Oil & Gas Llc, Union Texas Petroleum, Anderson-Prichard Oil Corp, Snowden Oil Co, T & T Oil Company, Uprr, Et Al.

Counties Intersected by the CLIFF field

Logan46
Logan

Other Major Fields in Colorado most active by total wells

Compare the CLIFF field against the other busiest oil and gas fields in Colorado: