Dennis No. 2 Dam
Dennis No. 2
Dennis No. 2 is a private earth dam located in Sonoma, California, specifically in the city of Windsor. Completed in 1997, this dam stands at a height of 60 feet and has a maximum storage capacity of 148 acre-feet. It serves primarily for water supply purposes, including irrigation and water supply to the surrounding area. The dam is regulated by the California Department of Water Resources and falls under the Safety of Dams jurisdiction.
Situated on Tr Dry Creek, Dennis No. 2 plays a crucial role in managing the water resources of the region. It has a low hazard potential and has been assessed as being in satisfactory condition as of September 2017. The dam has a drainage area of 0.25 square miles and a surface area of 9 acres. With its strategic location and design, Dennis No. 2 ensures the efficient utilization of water for various purposes while adhering to state regulatory guidelines.
With its reliable infrastructure and consistent inspection and enforcement measures, Dennis No. 2 exemplifies responsible water resource management in California. The dam's compliance with state permitting, inspection, and enforcement requirements underscores its commitment to safety and sustainability. As a vital component of the local water supply system, Dennis No. 2 continues to contribute to the resilience of the region's water resources and highlights the importance of proactive dam management in mitigating potential risks associated with climate variability and water scarcity.
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 Dennis No. 2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Dry C Blw Lambert Br Nr Geyserville Ca | 106 cfs | → |
| Russian R A Geyserville Ca | 79 cfs | → |
| Russian R A Digger Bend Nr Healdsburg Ca | 86 cfs | → |
| Dry C Nr Geyserville Ca | 200 cfs | → |
| Russian R A Jimtown Ca | 84 cfs | → |
| Russian R Nr Healdsburg Ca | 86 cfs | → |
About Dennis No. 2
Where does the data for Dennis No. 2 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 below 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.
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.