Clear Lake dam
Clear Lake
Clear Lake, also known as Cache Creek, is a captivating water resource nestled in Lake County, California. Owned by the local government, this reservoir is regulated by the Department of Water Resources and the Safety of Dams. Completed in 1914, Clear Lake serves primarily for irrigation purposes but also plays a role in flood risk reduction, hydroelectric power generation, and providing water supply to the region.
This concrete gravity dam stands at a height of 35 feet with a hydraulic height of 35 feet and a structural height of 42.5 feet. With a storage capacity of 378,000 acre-feet and a surface area of 43,900 acres, Clear Lake has a normal storage of 320,000 acre-feet. The spillway, controlled and 118 feet wide, ensures controlled water release during high flow events. Despite its low hazard potential, Clear Lake has a very high risk assessment rating, emphasizing the importance of proper risk management measures for this critical water resource.
As an enthusiast of water resources and climate, Clear Lake offers a fascinating landscape to explore the intricate balance between human needs and environmental conservation. With its rich history, diverse purposes, and unique characteristics, this reservoir serves as a valuable asset in sustaining the water needs of the community while facing the challenges posed by climate change and water resource management.
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 Clear Lake -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Cache C Nr Lower Lake Ca | 628 cfs | → |
| Putah C Nr Guenoc Ca | 39 cfs | → |
| Nf Cache C Nr Clearlake Oaks Ca | 42 cfs | → |
| Bear C Ab Holsten Chimney Cyn Nr Rumsey Ca | 20 cfs | → |
| Kelsey C Nr Kelseyville Ca | 13 cfs | → |
| Big Sulphur C A G Resort Nr Cloverdale Ca | 10 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Clear Lake .
Boat launches
- Ball Park Avenue 14775, Clearlake
- Island Drive Lake County
- Walker Ridge Road Lake County
- Lake County
- Lucerne Harbor Park
- 3rd Street 20, Lakeport
Campgrounds
Fishing spots
Track Clear 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 Clear Lake
Where does the data for Clear 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 Low 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 Clear Lake .