Timothy Lake dam
Timothy Lake
Timothy Lake, located in Clackamas County, Oregon, is a captivating reservoir with a primary purpose of hydroelectric power generation. This private-owned lake, managed by the Federal Energy Regulatory Commission, holds a significant storage capacity of 66,000 acre-feet and covers an expansive surface area of 1,430 acres. The dam, completed in 1956, stands at a height of 100 feet and has a controlled spillway to manage water flow.
The Oak Grove River feeds into Timothy Lake, providing a vital water source for the surrounding area. The lake is not only essential for hydroelectric power but also serves as a recreational destination for visitors seeking outdoor activities such as fishing, boating, and hiking. With a maximum discharge capacity of 16,000 cubic feet per second, the dam plays a crucial role in regulating water flow and ensuring safety for downstream areas.
Despite its high hazard potential, Timothy Lake has not undergone a recent condition assessment. However, emergency preparedness measures are in place, with an Emergency Action Plan last revised in May 2021. With its strategic location and impressive infrastructure, Timothy Lake continues to be a significant contributor to water resource management and climate resilience efforts in the region.
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 Timothy Lake -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Oak Grove Fork Near Government Camp | 71 cfs | → |
| Oak Grove Fork Above Powerplant Intake | 296 cfs | → |
| Oak Grove Fork At Ripplebrook Campground | 111 cfs | → |
| Clackamas River Above Three Lynx Creek | 931 cfs | → |
| Beaver Creek | 35 cfs | → |
| Blazed Alder Creek Near Rhododendron | 18 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Timothy Lake.
Boat launches
- Hoodview Campground
- Gone Creek Campground
- Clear Lake Campground
- Harriet Lake
- Sandstone Bridge Boat Access Day Use
- Hole In The Wall Boat Access Day Site
Campgrounds
- Timothy Lake- Pine Point Campground
- Pine View Campgound
- Tim
- Timothy Lake
- Hood View Campgound
- Timothy Lake- Stone Creek Campground
Paddle runs
- Timothy Lake Dam To Slackwater Of Harriet Lake
- Salmon River Canyon (Split Falls To Road Access)
- Welches Run
- North Fork Clackamas River
- Mt. Hood Wilderness Boundary To Confluence With Sandy River
- Sandy River
More reservoirs
Track Timothy Lake 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 Timothy Lake
Where does the data for Timothy Lake 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 High 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 Timothy Lake.