The Beavers and The Steep Gullies

Information about A-Basin's Terrain Expansion

Arapahoe Basin Ski Area welcomes its latest terrain expansion into The Beavers & The Steep Gullies. The commencement of this plan follows a comprehensive Master Planning Process and Environmental Review. Located to the west of the current ski area boundary, the new terrain will add approximately 468 acres of skiable terrain to Arapahoe Basin, bringing the ski area’s total acreage to 1,428 acres upon completion of the project. The new terrain will accommodate a wide range of skiers, from intermediates to experts. 

About the Terrain

The Beavers

Terrain in The Beavers runs the gamut from intermediate (blue square) groomed runs to most difficult (black diamond) tree skiing. The terrain is rolling and varied, with open bowl skiing at the top and flowy glades on the west side and the lower 2/3 of the terrain.

The Steep Gullies

Numbered 1 through 7, The Steep Gullies will be the most challenging skiing at Arapahoe Basin. These steep, narrow chutes vary in pitch and width, and will be rated as "extreme" (double-black diamond). All terrain in The Steep Gullies will be designated as "hike back," meaning that guests will hike or skin back to the bottom of the Pallavicini Lift upon completion of their run.

Fast Facts

  • Acreage
    • 468 total acres
    • 339 lift-served acres in The Beavers
    • 129 hike-back acres in The Steep Gullies
  • Chairlift stats
    • The Beavers chair will be a fixed-grip quad (4 people per chair)
    • Lift manufacturer TBD
  • About the hike back trail
    • The hike back trail will lead from the bottom of The Beavers & The Steep Gullies terrain to the bottom terminal of the Pallavicini Lift
    • Hike time is approximately 15-30 minutes, depending on equipment and fitness level
    • Guests may use skins to make their way back to the lift

Construction Timeline

Proposed DateProposed Action
Summer 2017Construction will begin on 468 acres in The Beavers & The Steep Gullies, including egress routes, glading and cutting of groomed trails
2017-18 ski seasonThe Steep Gullies & a portion of The Beavers will open to skiing and riding as in-bounds hike-back terrain*
Summer 2018Installation of a fixed-grip quad chairlift in The Beavers commences
2018-19 ski seasonThe Beavers opens as lift-served terrain (339 acres)
The Steep Gullies will remain hike-back terrain*
* skiers will hike along an egress route to the bottom of the Pallavicini Lift

Trail Map: The Beavers & The Steep Gullies

Master Development Plan documents

The U.S. Forest Service conducted a thorough Environmental Review and public commenting process. To read U.S. Forest Service documentation related to The Beavers & The Steep Gullies expansion, click here.

November 2016: The USFS released the Final Record of Decision approving expansion into The Beavers & The Steep Gullies.

August 2016: The USFS released the Final Environmental Impact Statement and Draft Record of Decision.

February 2016: The USFS released the Draft Environment Impact Statement (EIS), commencing a 45-day public comment period.

October 2013: On October 3, we hosted a guided hike of the proposed Beavers expansion area. Click here to read the Summit Daily News recap of the hike.

For information on our projects and process of our Master Development Plan, read this document:
Public Notice - Arapahoe Basin Proposed Projects (U.S. Forest Service)

The 2012 Master Development Plan is available to the public. Click here to download the PDF (9MB). Please note: the file is large and may take a moment to download.

Have questions about the expansion? Contact us!

For media inquiries or questions about the expansion into The Beavers & The Steep Gullies, email us at

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