Coen C-3 dam
Coen C-3
Coen C-3 is a privately owned earth dam located in Healdsburg, California, along the Tr Dry Creek. Built in 1982, this dam stands at a height of 97 feet and has a storage capacity of 480 acre-feet, primarily serving the purpose of water supply for irrigation and other uses in the area. With a low hazard potential and a satisfactory condition assessment as of September 2017, Coen C-3 is regulated by the California Department of Water Resources (DWR) and undergoes regular inspections to ensure its safety and functionality.
Situated in Sonoma County, Coen C-3 boasts a surface area of 16 acres and a drainage area of 0.32 square miles. Despite its relatively small size, this dam plays a crucial role in providing water resources for the surrounding community. Managed by a private entity, Coen C-3 is subject to state jurisdiction, permitting, inspection, and enforcement to meet regulatory standards set by the DWR. The dam's location within the San Francisco District and its proximity to Healdsburg highlight its significance in water management and supply for the region.
With its efficient design and satisfactory condition, Coen C-3 stands as a testament to effective water resource management in California. The dam's low hazard potential, along with its regular inspections and state regulatory oversight, ensures the safety and reliability of its water supply operations. As climate change continues to impact water resources, structures like Coen C-3 play a vital role in securing and managing water supplies for the future, making it a key asset for water resource and climate enthusiasts alike.
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 Coen C-3 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Dry C Blw Lambert Br Nr Geyserville Ca | 70 cfs | → |
| Russian R A Geyserville Ca | 169 cfs | → |
| Dry C Nr Geyserville Ca | 200 cfs | → |
| Russian R A Digger Bend Nr Healdsburg Ca | 249 cfs | → |
| Russian R A Jimtown Ca | 179 cfs | → |
| Russian R Nr Healdsburg Ca | 247 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Coen C-3.
Boat launches
- Public Boat Ramp Spur Sonoma County
- Fisherman's Trail Sonoma County
- Ball Park Avenue 14775, Clearlake
- Lake County
- 3rd Street 20, Lakeport
- Doran Beach Road 355, Bodega Bay
Campgrounds
Fishing spots
Paddle runs
- Cache Creek
- North Fork Cache Creek
- Olema Ranch Campground To Caltrans Corporation Yard At Point Reyes Station
More reservoirs
Track Coen C-3 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 Coen C-3
Where does the data for Coen C-3 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 Coen C-3.