Mountain Lake
Area: 198 acres
Volume: 8800 acre ft
altitude: 922 ft asl

Mountain Lake Dam License Agreement

Raw water to Doe Bay Water Users
179 acre ft/yr

Valve to control discharge
into Cascade Creek

Raw water to Olga Water Users
94 acre ft/yr

Cascade Lake
Area: 172 acres
Volume: 4600 acre ft
altitude: 354 ft asl

Unnamed
creek
no fish

Cascade Creek
Native trout
sea run cut throat
natural and enhanced salmon run

Cascade Lake Dam
Rosario Hydro penstock
water rights

Diversion from Cascade Creek
to Cascade Lake
1206 acre ft/yr         return flow
V notch weir control
Altitude 385 ft asl

Rosario, on Puget Sound                   Buck Bay, on Puget Sound                         


Estuarine wetland damaged
due to “temporary” fix to culvert

Cascade Creek
Native trout

Details of the Mountain Lake
Conservation Plan
Last updated 8/20/05

Useful Links:
Details of the Mountain Lake Conservation Plan
East Orcas Watershed Planning
Olga Water Users home page

Water Rights in Mountain Lake,
Cascade Creek
and Cascade Lake