Lake Roslyn
Lake Roslyn is an earth dam located in Clackamas County, Oregon, built in 1959. It carries a Significant hazard potential classification.
About Lake Roslyn
The primary purpose of Lake Roslyn is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by Pge (public utility). It impounds the Big And Little Sandy Rivers near Troutdale.
The dam stands 49 feet tall and stretches 8,000 feet across, creates a reservoir covering 152 acres, has a maximum storage capacity of 2,011 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1959, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life.
At 49 feet, this dam is taller than 92% of dams nationwide.
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Location
| State | Oregon |
| County | Clackamas |
| Nearest City | Troutdale |
| River/Stream | Big And Little Sandy Rivers |
| Coordinates | 45.42878, -122.24175 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 49 ft |
| Dam Height | 45 ft |
| Dam Length | 8,000 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 2,011 acre-ft |
| Max Storage | 2,011 acre-ft |
| Normal Storage | 2,011 acre-ft |
| Surface Area | 152 acres |
| Drainage Area | 4 sq mi |
| Max Discharge | 800 cfs |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | PGE |
| Owner Type | Public Utility |
| Hazard Classification | Significant |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OR00543 |
| Federal ID | OR00543 |
| More Info | State Dam Safety Program |