Image: Transmission lines across the sagebrush plateau

Image: Claret Cup Cactus

Image:  230-kV and 115-kV transmission lines

Image: Existing 115-kV transmission line and ROW

Image: West Needles Contiguous Area


Proposed Right-of-Way Amendment

Tri-State Transmission Line Rebuild


Environmental Assessment


The Bureau of Land Management (BLM) Colorado Southwest District has released a scoping report that documents and summarizes public input regarding a proposal by Tri-State Generation and Transmission Association (Tri-State) to upgrade an existing transmission line system across private, state, and federal lands in southwestern Colorado.  Tri-State is proposing to upgrade and rebuild the existing Montrose-Nucla-Cahone transmission line from 115 kilovolts (kV) to 230 kV.


The Tri-State Montrose-Nucla-Cahone Transmission Improvement Project area includes about 59 linear miles of public land in the BLM Uncompahgre and Tres Rios field offices and about 46 linear miles of public land in the Grand Mesa, Uncompahgre, Gunnison, and San Juan national forests.  An additional 20 miles of line crosses lands managed by the State of Colorado or private landowners.


As the designated Lead Federal Agency, the BLM Southwest District has determined that an Environmental Assessment (EA) is required before the BLM and U.S. Forest Service (FS) can render separate decisions regarding the proposal.

Public scoping was the first of several opportunities for public involvement. During public scoping, the BLM accepted input regarding potential project issues, impacts, and alternatives that should be addressed in the EA.


A Preliminary EA should be available for public review and comment in Fall 2015. Submitting comments during either comment period establishes standing for BLM appeals and Forest Service objections.

For additional project information, contact BLM NEPA Coordinator Gina Jones by phone at (970) 240-5381 or by email to Additional information about the FS objection process can be obtained by contacting Liz Mauch by phone at (970) 240-5405 or by email to


Project Maps

Click on Maps to link to a PDF

Tri-State Transmission Line EA Scoping Map

Map showing existing and proposed Dolores River Crossing

Proposed Montrose-Nucla-Cahone Transmission Line Rebuild

Existing and Proposed


Dolores River Crossing



Scoping Report (November 2014)

Scoping Notice


 Appendix A


U.S. Forest Service LogoGrand Mesa Uncompahgre and Gunnison National Forests



 Tri-State EA Timeline

BLM Colorado Southwest District
2465 South Townsend Ave
Montrose, Colorado 81401

Phone: 970.240.5300
FAX: 970.240.5367
Lori Armstrong, District Manager