Colorado · Area of Critical Environmental Concern
Glenwood Springs Debris Flow Hazard Zones ACEC
BLM found a fish resource and a natural hazard here, and its plan calls for special management. BLM's records place at least 3 active mining claims and 18 rights of way inside the line today, and four grazing allotments cover part of it. It covers 6,101 acres and was designated October 17, 2024, in the 2024 Colorado River Valley RMP (Supplemental EIS). In the plan's name, RMP stands for resource management plan and EIS for environmental impact statement.
One of the 1,120 places the Bureau of Land Management has designated an Area of Critical Environmental Concern. This page shows its line, what BLM found there and what sits inside it.
The line
Who holds the claims
At least 3 claims sit inside this line: 3 active, 3 with a holder BLM names. BLM lists 3 as Active.
- RMR AGGREGATES INC3claims
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
18 rights of way sit inside the line. BLM files 16 under non-energy facilities, 1 under other energy facilities and 1 under oil & gas facilities.
- GLENWOOD SPRINGS, CITY OF (Colorado)5rights of way
- A private individual, name withheld by this site2rights of way
- QWEST CORP DBA CENTURYLINK QC2rights of way
- RAD DEVELOPMENT GLENWOOD LLC1right of way
- GARFIELD COUNTY (Colorado)1right of way
- GARFIELD COUNTY (Colorado) - EMERGENCY COMMUNICATIONS AUTHORITY1right of way
- USFS (R2 ROCKY MOUNTAIN REGION)1right of way
- Holder not listed by BLM1right of way
- CO DEPT OF TRANS1right of way
- ROCKY MOUNTAIN NATURAL GAS LLC1right of way
- QWEST CORPORATION D/B/A/ CENTURYLINK QC1right of way
- PUBLIC SERVICE COMPANY OF COLORADO1right of way
Grazing allotments
4 grazing allotments cover part of this line. Their permittees aren't named here yet.
- Allotment USFS-GRZ-149917.01060216,830acres
- Lookout Mtn6,251acres
- Storm King5,899acres
- Paradise Cr2,980acres
The nearest areas
- Deep Creek ACECColorado · 4,422 acres · at least 46 active mining claims, 3 rights of way, 6 grazing allotments covering part of it15miles
- Thompson Creek ACECColorado · 3,541 acres · 3 grazing allotments covering part of it16miles
- Lyons Gulch ACECColorado · 429 acres · 2 grazing allotments covering part of it18miles
- Grand Hogback ACECColorado · 4,306 acres · 3 rights of way, 3 grazing allotments covering part of it20miles
- Sheep Creek Uplands ACECColorado · 3,905 acres · 3 grazing allotments covering part of it21miles
More from BLM's Colorado office
Every area BLM's Colorado office holdsThe proposed rule
A proposed rule, RIN 1004-AF53, would change how BLM drafts every land use plan, and how it designates ACECs like Glenwood Springs Debris Flow Hazard Zones ACEC. The comment window hasn't opened: the proposed rule wasn't in the Federal Register at our last check. The Watch sends one email the day it prints.
The rule's abstract
The purpose of this rulemaking is to establish in regulations an updated process for the approval of the development, revision, amendment, and maintenance of land use plans, as provided for by the Federal Land Policy and Management Act of 1976, for public lands administered by the Bureau of Land Management (BLM). Additionally, this rulemaking will provide clarification of the process the BLM uses for designating Areas of Critical Environmental Concern.Unified Agenda entry for RIN 1004-AF53, Publication ID 2026, reginfo.gov (OMB OIRA), read Oct 18, 2026