Mountain Lake Dam

High HazardFair ConditionEmergency Action Plan: Yes

Location

StateWashington
CountySan Juan
Nearest CityOlga
River/StreamCascade Creek
Coordinates48.64991, -122.81250

Physical Characteristics

Dam TypeRockfill
NID Height17 ft
Dam Length172 ft
Year Completed1905 (121 years old)

Storage & Hydraulics

NID Storage3,010 acre-ft
Max Storage3,010 acre-ft
Normal Storage2,870 acre-ft
Surface Area180 acres
Drainage Area2 sq mi
Max Discharge200 cfs

Ownership & Safety

PurposeRecreation
OwnerWA PARKS
Owner TypeState
Hazard ClassificationHigh
Condition AssessmentFair
Last Inspection07/23/2024
Emergency Action PlanYes

Identifiers

NID IDWA00279
Federal IDWA00279
More InfoState Dam Safety Program

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