Project update: WAPA began construction on this project in August 2022. To learn the latest on the rebuild, visit the project construction webpage. ​This page, which covers the project’s environmental review phase, will not be updated.
WAPA proposes to rebuild approximately 32 miles of double wood-pole structure 115-kilovolt transmission line that exists between Estes Park and Flatiron Reservoir in Larimer County, Colo. The proposal would remove 16 miles of transmission line, and modernize 16 miles to steel-pole double-circuit 115-kV transmission line. The reduction and modernizing of transmission lines will occur on Federal, state and private lands. The public parcels are administered by the Arapaho and Roosevelt National Forest, which is a cooperating agency in the project.

The proposed project would:​

  • Rebuild aging and deteriorating transmission lines
  • Reduce the number of linear miles of transmission corridors and the associated environmental footprint
  • Ensure that the transmission lines comply with applicable codes and requirements
  • Reduce potential for disruption of customer service due to wildfire hazards
  • Improve access for maintenance and emergencies


WAPA published its record of decision for the Estes-Flatiron Transmission Lines Rebuild Project in the Federal Register March 21, 2019. WAPA has decided to use the agency preferred alternative route to build a new double-circuit 115-kilovolt transmission line and remove two existing transmission lines between Estes Substation and Flatiron Substation, west of Loveland, Colorado. The agency preferred alternative was announced in December 2016 and described in detail in the Final Environmental Impact Statement published April 12, 2018.

Next steps: WAPA will finalize design and complete construction specifications. ​


  • Record of decision available for Estes-Flatiron Transmission Lines Rebuild Project, news release April 11, 2019
  • Final environmental review available for Estes-Flatiron Transmission Project​, news release April 13, 2018
  • Newsletter 4 (pdf), December 2016
  • WAPA selects agency preferred alternative for Estes-Flatiron Rebuild, news release Dec. 5, 2016
  • Estes-Flatiron project engages local citizens in environmental review, news feature Oct. 2, 2014
  • Sept. 23, 24: Western holding informal sessions for Estes-Flatiron draft EIS, media advisory Sept. 15, 2014
  • Newsletter 3 (pdf), August 2013
  • Scoping reports available, press release Dec. 10, 2012
  • Citizens share ideas at workshops, blog post Oct. 10, 2012
  • Newsletter 2 (pdf), Sept. 13, 2012
  • Estes-Flatiron project scoping extended to Oct. 19, press release Sept. 13, 2012
  • Newsletter 1 (pdf), July 2012
  • WAPA extends scoping period to Aug. 31, press release June 27, 2012
  • Notice of Intent to Conduct an EIS, April 17, 2012
  • Environmental Impact Statement process announced, press release March 29, 2012


Records of decision

Final EIS and appendices

Or download smaller sections of the Final EIS

Selected route – Agency Preferred Alternative

Draft EIS and appendices

Draft EIS drop-in learning session materials

Scoping materials and reports


Regional Environmental Manager, J0400
Rocky Mountain Region
Western Area Power Administration
5555 East Crossroads Avenue
Loveland, CO 80538

Last modified on May 7th, 2024