Usibelli No. 2 dam
Usibelli No. 2
Usibelli No. 2 is a privately owned earth dam located in Pope Valley, California, specifically on the Tr Maxwell Cr river. Completed in 1973, this dam serves primarily for water supply purposes such as irrigation and water storage. With a height of 26 feet and a storage capacity of 900 acre-feet, it covers a surface area of 56 acres and has a drainage area of 0.23 square miles. The dam is regulated, inspected, and enforced by the California Department of Water Resources, Safety of Dams division.
Despite its satisfactory condition assessment as of September 2017, Usibelli No. 2 has a high hazard potential, highlighting the importance of regular inspections and maintenance. The dam has a designated emergency action plan (EAP) and a one-year inspection frequency to ensure its safety and functionality. The surrounding area, including Napa County, relies on this dam for crucial water supply needs, making it a vital infrastructure for the region's agricultural and environmental sustainability.
Owned by a private entity, Usibelli No. 2 plays a significant role in water resource management within the San Francisco District. Located in a picturesque setting, this dam not only supports local water supply but also showcases the intersection of engineering, water conservation, and climate resilience. As water resource and climate enthusiasts continue to monitor and advocate for sustainable practices, Usibelli No. 2 stands as a prominent example of infrastructure crucial for supporting communities and ecosystems in an ever-changing climate.
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 Usibelli No. 2 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Napa R Nr St Helena Ca | 15 cfs | → |
| Putah C Nr Guenoc Ca | 51 cfs | → |
| Sonoma Creek A Kenwood Ca | 3 cfs | → |
| Napa R Nr Napa Ca | 41 cfs | → |
| Putah C Nr Winters Ca | 362 cfs | → |
| Sonoma C A Agua Caliente Ca | 14 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Usibelli No. 2.
⚓ Boat launches
- Chaparral Cove Napa County
- Knoxville Road 1601, Napa County
- Napa Valley Vine Trail, Napa
- Cuttings Wharf Road 3175-3337, Napa
- Cuttings Wharf Road 3270, Napa
- Ball Park Avenue 14775, Clearlake
⛺ Campgrounds
- Chaparral Cove - Lake Berryessa - Usbr
- Camp Site 36-55
- Camp Site 1-35
- Camp Site 56-72
- Camp Site 73-100
- Manzanita Canyon - Lake Berryessa - Usbr
🎣 Fishing spots
More fishing →🛶 Paddle runs
- Cache Creek
- North Fork Cache Creek
- Olema Ranch Campground To Caltrans Corporation Yard At Point Reyes Station
🛡 More reservoirs
More reservoirs →Track Usibelli 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 Usibelli No. 2
Where does the data for Usibelli 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 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 Usibelli No. 2.