Colorado · Area of Critical Environmental Concern

Gypsum Valley ACEC

BLM found a natural system here, and its plan calls for special management. BLM's records place at least 2 active mining claims (and 9 more BLM lists as Filed), 1 oil and gas lease and 3 rights of way inside the line today, and three grazing allotments cover part of it. It covers 6,171 acres and was designated January 29, 2020, in the 2020 TRFO ACEC RMP Amendment. In the plan's name, TRFO stands for BLM's Tres Rios Field Office and RMP for resource management plan.

The line

Ground: USGS The National Map, topographic tiles. Boundaries: BLM's own, read Oct 20, 2026. 12 marks are where BLM's own maps draw them; 2 claims are placed at the middle of the section their land description names, not at the stakes on the ground. Hover or tap one for its holder. The lease and 3 grazing allotments below aren't marked.

Who holds the claims

At least 11 claims sit inside this line: 2 active and 9 filed and pending, 11 with a claimant BLM withholds under the Privacy Act. BLM lists 9 as Filed and 2 as Active.

• Names withheld by BLM (private individuals)11claims

BLM's mining rules list designated ACECs among the places where mining that disturbs the surface beyond casual use needs a plan of operations BLM approves. Exploration of five acres or less can go ahead on a notice instead.

The rights of way

3 rights of way sit inside the line. BLM files 2 under non-energy facilities and 1 under other energy facilities.

• CO DEPT OF TRANS2rights of way
• PAR PACIFIC HOLDINGS INC1right of way

The oil and gas leases

1 active oil and gas lease sits inside the line. 1 of it took effect before the area was designated on January 29, 2020.

• Holder not listed by BLM1lease

Grazing allotments

3 grazing allotments cover part of this line. Their permittees aren't named here yet.

• Gypsum Valleys45,261acres
• Gyp Ridge4,240acres
• Gypsum Gap3,781acres

The nearest areas

• Dry Creek Basin ACECColorado · 10,917 acres · 2 rights of way, a grazing allotment covering part of it5miles
• Paradox Rock Art ACECColorado · 1,083 acres · at least 3 active mining claims, 3 grazing allotments covering part of it12miles
• Biological Soil Crust ACECColorado · 385 acres · 2 grazing allotments covering part of it14miles
• Sinbad Valley ACECColorado · 6,388 acres · 1 right of way, 4 grazing allotments covering part of it32miles
• Dolores River Riparian ACECColorado · 7,428 acres · at least 2 active mining claims and 3 more BLM lists as Filed, 3 rights of way, 11 grazing allotments covering part of it32miles

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