Long Valley West No. 2 dam
Long Valley West No. 2
Long Valley West No. 2 is a privately owned earth dam located in Napa, California, along the Tr Pope Creek. Completed in 1982, this dam stands at a height of 35 feet and has a storage capacity of 177 acre-feet, primarily used for irrigation and water supply purposes. With a low hazard potential and a satisfactory condition assessment, this dam has been regulated by the California Department of Water Resources (DWR) under the Safety of Dams program, ensuring regular inspections and enforcement to maintain its safety and integrity.
Situated within the San Francisco District, Long Valley West No. 2 serves as a crucial water resource infrastructure, supporting the local agricultural activities in the region. The dam's design and construction reflect its importance in providing reliable water supply to the surrounding areas. Despite its modest size, the dam plays a significant role in managing water resources and ensuring sustainable usage for irrigation and other purposes. With state jurisdiction and regulatory oversight, Long Valley West No. 2 exemplifies the commitment to maintaining water infrastructure standards and safety in California.
As a key component of the water supply system in Napa County, Long Valley West No. 2 has been integral in meeting the agricultural and irrigation needs of the region. With a history of satisfactory condition assessments and regular inspections, this dam showcases the importance of proactive management and maintenance in ensuring the resilience of water infrastructure against the backdrop of changing climate conditions. Its strategic location and purposeful design underscore the essential role that dams play in supporting water resource management efforts and climate resilience initiatives in California.
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 Long Valley West No. 2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Putah C Nr Guenoc Ca | 30 cfs | → |
| Napa R Nr St Helena Ca | 8 cfs | → |
| Sonoma Creek A Kenwood Ca | 2 cfs | → |
| Maacama C Nr Kellogg Ca | 14 cfs | → |
| Matanzas C A Santa Rosa Ca | 3 cfs | → |
| Cache C A Rumsey Ca | 737 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Long Valley West No. 2.
Boat launches
- Chaparral Cove Napa County
- Knoxville Road 1601, Napa County
- Ball Park Avenue 14775, Clearlake
- Napa Valley Vine Trail, Napa
- Island Drive Lake County
- Cuttings Wharf Road 3175-3337, Napa
Campgrounds
- Camp Site 1-35
- Camp Site 36-55
- Camp Site 73-100
- Chaparral Cove - Lake Berryessa - Usbr
- Camp Site 56-72
- Bothe - Napa Valley State Park
Fishing spots
Track Long Valley West No. 2 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 Long Valley West No. 2
Where does the data for Long Valley West 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 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 Long Valley West No. 2.