Ewing dam
Ewing
Ewing Reservoir, located in Trinity County, California, is a critical water supply infrastructure owned by the local government and regulated by the Department of Water Resources (DWR) for dam safety. Completed in 1972, this earth dam stands at a height of 63 feet, with a hydraulic height of 58 feet, and a length of 550 feet. The reservoir has a storage capacity of 887 acre-feet, serving as a vital water source for the surrounding community in Hayfork.
Despite its high hazard potential, Ewing Reservoir is currently in satisfactory condition, with the last inspection conducted in May 2020. The dam is designed to withstand potential risks, and emergency action plans are in place to ensure the safety of the area in case of any unforeseen events. The reservoir is situated along Ewing Gulch, with a drainage area of 0.69 square miles, providing a surface area of 43 acres for water storage. Congressman Jared Huffman represents the area in the Sacramento District, where Ewing Reservoir plays a crucial role in water management and supply.
As a significant water supply source in the region, Ewing Reservoir serves as a lifeline for the community, ensuring water security and sustainability in Trinity County, California. With state-regulated oversight and regular inspections, the dam continues to provide essential services while adhering to safety standards set by the DWR. Climate enthusiasts and water resource experts can appreciate the critical role that Ewing Reservoir plays in managing water resources and mitigating potential risks in the face of changing environmental 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 Ewing -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Trinity R A Douglas City Ca | 972 cfs | → |
| Trinity R A Junction City Ca | 960 cfs | → |
| Trinity R Ab Nf Trinity R Nr Helena Ca | 1,100 cfs | → |
| Indian C Nr Douglas City Ca | 20 cfs | → |
| Trinity R Bl Limekiln Gulch Nr Douglas City Ca | 973 cfs | → |
| Nf Trinity R A Helena Ca | 47 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Ewing.
Boat launches
- Last Chance Trinity River Access
- Dump Hole
- Bagdad
- Bucktail Hole
- Rush Creek Road 7542, Trinity County
- Trinity Dam Boulevard Trinity County
Campgrounds
Fishing spots
Paddle runs
- Nine Mile Bridge To Confluence With South Fork Trinity River
- Four Tenths Mile Upstream With The Confluence Of Foley Creek Four Tenths Mile Upstream With Confluence With Foley Creek To Trinity Wsr
- Confluence With Smoky Creek To Four Tenths Of A Mile West And Downstream Of Double Cabins Site
- Middle Fork Cottonwood Creek
- Two Tenth Mile West And Downstream Of Double Cabins Site To Confluence With Smoky Creek
More reservoirs
Track Ewing 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 Ewing
Where does the data for Ewing 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 Ewing.