Oswego Lake Dam

Significant HazardNot Rated ConditionEmergency Action Plan: Not Required

Location

StateOregon
CountyClackamas
Nearest CityLAKE OSWEGO
River/StreamTUALATIN RIVER (OFFSTREAM)
Coordinates45.41025, -122.66795

Physical Characteristics

Dam TypeConcrete
NID Height34 ft
Dam Height32 ft
Dam Length120 ft
Year Completed1921 (105 years old)

Storage & Hydraulics

NID Storage9,800 acre-ft
Max Storage7,000 acre-ft
Normal Storage9,800 acre-ft
Surface Area433 acres
Drainage Area6 sq mi
Max Discharge1,400 cfs

Ownership & Safety

PurposeHydroelectric
OwnerLAKE OSWEGO CORPORATION
Owner TypePrivate
Hazard ClassificationSignificant
Condition AssessmentNot Rated
Last Inspection11/19/2020
Emergency Action PlanNot Required

Identifiers

NID IDOR00237
Federal IDOR00237
More InfoState Dam Safety Program

Nearby Dams

Three Creeks Natural Area 3.9 mi Significant Crown Zellerbach (lagoon) 4.7 mi Low Willamette Falls 4.7 mi Significant Hershiser Reservoir 5.5 mi Low Tualatin Park 6.5 mi Significant Veterans Reservoir 6.7 mi Significant Portland #1 (mt.tabor) 7.7 mi High Portland #6 (mt.tabor) 7.7 mi High Portland #3 (washington Park) 7.8 mi High Portland #5 (mt.tabor) 7.8 mi High