Lake Roslyn dam
Lake Roslyn
Lake Roslyn in Clackamas, Oregon, is a fascinating hydroelectric reservoir managed by a public utility. The dam, completed in 1959, stands at a height of 45 feet and spans a length of 8000 feet, creating a storage capacity of 2011 acre-feet. With a surface area of 152 acres and a drainage area of 4.5 square miles, the reservoir is fed by the Big and Little Sandy Rivers and boasts a maximum discharge of 800 cubic feet per second.
Situated in a picturesque location in Troutdale, Lake Roslyn not only serves as a source of hydroelectric power but also provides recreational opportunities and supports wildlife habitats. The dam, primarily made of earth, features a slide gate for outlet control and is regulated by the Oregon Water Resources Department. Despite its significant hazard potential, the dam's condition is currently not rated, highlighting the importance of regular inspections and risk management measures to ensure its structural integrity and the safety of surrounding communities.
As a key water resource in the region, Lake Roslyn plays a vital role in water management and climate resilience efforts. Its strategic location and design make it a valuable asset for sustainable energy production and flood control. With proper maintenance and monitoring, this reservoir continues to contribute to the state's renewable energy goals while safeguarding against potential risks associated with dam infrastructure.
Dam data reference
Condition Assessment
- Satisfactory
- No existing or potential dam safety deficiencies are recognized. Acceptable performance is expected under all loading conditions (static, hydrologic, seismic) in accordance with the minimum applicable state or federal regulatory criteria or tolerable risk guidelines.
- Fair
- No existing dam safety deficiencies are recognized for normal operating conditions. Rare or extreme hydrologic and/or seismic events may result in a dam safety deficiency. Risk may be in the range to take further action.
- Poor
- A dam safety deficiency is recognized for normal operating conditions which may realistically occur. Remedial action is necessary. POOR may also be used when uncertainties exist as to critical analysis parameters which identify a potential dam safety deficiency.
- Unsatisfactory
- A dam safety deficiency is recognized that requires immediate or emergency remedial action for problem resolution.
- Not Rated
- The dam has not been inspected, is not under state or federal jurisdiction, or has been inspected but, for whatever reason, has not been rated.
Hazard Potential Classification
- High
- Dams assigned the high hazard potential classification are those where failure or mis-operation will probably cause loss of human life.
- Significant
- Dams assigned the significant hazard potential classification are those dams where failure or mis-operation results in no probable loss of human life but can cause economic loss, environmental damage, disruption of lifeline facilities, or impact other concerns. Significant hazard potential classification dams are often located in predominantly rural or agricultural areas but could be in areas with population and significant infrastructure.
- Low
- Dams assigned the low hazard potential classification are those where failure or mis-operation results in no probable loss of human life and low economic and/or environmental losses. Losses are principally limited to the owner's property.
- Undetermined
- Dams for which a downstream hazard potential has not been designated or is not provided.
Plan around the weather
Same NOAA / yr.no feed Snoflo's iOS app uses. Watch the precipitation column on the meteogram -- rain on the basin upstream typically lifts inflow 24-72 hours later.
Next 5 days, hour by hour
Temperature line with weather symbols on top, snow + rain accumulation as columns, humidity as a dotted line.
5-day forecast table
Every 3 hours, broken out across temperature, snow, rain, humidity, and wind. Each cell is colour-coded relative to the column min/max.
| Time | Condition | Temp (°F) | Snow (in) | Rain (in) | Humidity (%) | Wind (mps) | Wind dir |
|---|---|---|---|---|---|---|---|
| Loading detailed forecast… | |||||||
15-day temperature & precipitation
Daily temperatures, snow, and rain projected over the next two weeks.
Nearby streamflow gauges
USGS streamgauges around Lake Roslyn -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Sandy River Blw Bull Run River | 1,150 cfs | → |
| Bull Run River Near Bull Run | 130 cfs | → |
| Little Sandy River Near Bull Run | 44 cfs | → |
| Sandy River Near Marmot | 665 cfs | → |
| South Fork Bull Run River Near Bull Run | 49 cfs | → |
| Beaver Creek At Troutdale | 1 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Lake Roslyn.
Boat launches
- Interstate 84, Corbett
- Feldheimer Park
- Lewis And Clark State Park
- Dalton Point, Bridal Veil
- A-1 Moorage
- North Shore Hand Launch
Campgrounds
- Oxbow Regional Park
- Barton Park
- Barton Park Camping
- Hiker/Biker Sites
- Kingfisher Group Camp
- Chinook Group Camp
Track Lake Roslyn in the Snoflo app
Save this dam as a favorite and get the local NOAA / yr.no forecast plus regional flow context wherever you are.
About Lake Roslyn
Where does the data for Lake Roslyn come from?
Structural and regulatory data come from the U.S. Army Corps of Engineers' National Inventory of Dams (NID). Weather forecast comes from NOAA / yr.no -- the same feed Snoflo's iOS app uses.
How often is the report updated?
NID structural data refreshes annually as the Corps publishes updated assessments. The weather forecast refreshes throughout the day.
What does the Significant hazard rating mean?
The Corps of Engineers' hazard potential classification grades probable consequences if the dam fails: High = probable loss of human life; Significant = no probable loss of human life but possible economic loss / environmental damage; Low = no probable loss of human life, only minor economic / environmental losses. See the Dam Data Reference card above for the full definitions.
What's "% of normal"?
The current storage value compared to the historical average storage on this calendar day. 100% = right on average; values above 100% mean above-normal storage (wet year); values below mean below-normal (dry year or drought).
Can I get alerts when storage crosses a threshold?
Yes -- alerts are managed in the Snoflo iOS app. Favorite this dam, set a threshold, and you'll get a push the moment conditions cross.
Other water bodies near here
Snoflo-tracked reservoirs and dams within driving distance of Lake Roslyn.