When water is diverted from Colorado's West Slope through the Alva B. Adams Tunnel to Colorado's East Slope, it is first deposited in East Portal, a small afterbay enclosed by East Portal Dam. East Portal sits to the southwest of Estes Park, Colorado on the boundary of Rocky Mountain National Park.
Water can exit East Portal through the spillway, depositing into Wind River, but it is almost always diverted via the Rams Horn Tunnel to Marys Lake and the Marys Lake Power Plant.
General
Project
Colorado-Big Thompson
Longitude
-105.57857
Latitude
40.32788
Watercourse
Wind River
Original Construction
1947
Dimensions
Crest Elevation
8265.0 ft
Structural Height
76 ft
Hydraulic Height (Normal Operating Depth at Dam)
10 ft
Crest Length
245 ft
Hydraulics & Hydrology
Spillway Capacity at Elevation
550 cfs at 8265.0
Contact
Owner
Title: Area Office Manager Organization: Eastern Colorado Area Office Address: 11056 W. County Rd 18E City: Loveland, CO 80537-9711 Fax: 970-663-3212 Phone: 970-667-4410
Operator
Title: Area Office Manager Organization: Eastern Colorado Area Office Address: 11056 W. County Rd 18E City: Loveland, CO 80537-9711 Fax: 970-663-3212 Phone: 970-667-4410
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