A And C dam
A And C
A and C, also known as Avanzino, is a privately owned dam located in Avanzino Ranch, California. Constructed in 1923, this earth dam stands at a height of 13 feet with a hydraulic height of 7.1 feet and a length of 1200 feet. Its primary purpose is for water supply, specifically for irrigation and water supply. The dam has a storage capacity of 800 acre-feet and covers a surface area of 210 acres, serving the surrounding area with water from the Sfk Willow Creek.
Despite being classified with a low hazard potential, A and C has undergone regular state inspections and enforcement to ensure its safety and functionality. The dam is regulated by the California Department of Water Resources under the Safety of Dams program, with permits, inspections, and enforcement mechanisms in place. Its condition was assessed as satisfactory as of September 2017, with the last inspection conducted in June 2020. This structure plays a crucial role in water resource management in the region, highlighting the importance of maintaining and monitoring such infrastructure in the face of changing climate conditions.
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 A And C -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pit R Nr Canby Ca | 2 cfs | → |
| Sf Pit R Nr Likely Ca | 119 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near A And C.
Boat launches
- Green Springs Boating Site
- Logan Slough Boating Site
- Big Sage Road Modoc County
- Duncan North Boating Site
- Duncan South Boating Site
- Dog Lake Campground
Campgrounds
- Janes Reservoir
- Jane's Reservoir Campground
- Reservoir C Campground
- Reservoir C
- Reservoir F
- Reservoir F Campground
Paddle runs
- Sally's Camp To Confluence With Willow Creek
- Wilcox Spring To Clear Lake National Wildlife Refuge Boundary
- Deep Creek
- Headwaters To Sw1/4 Of Sec 29, T40s, R22e
- Twelvemile Creek
More reservoirs
Track A And C 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 A And C
Where does the data for A And C 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 A And C.