Hog Flat dam
Hog Flat
Hog Flat, located in Susanville, California, is a private water supply dam on the Tr Susan River, completed in 1891. With a height of 15 feet and a hydraulic height of 11 feet, this earth dam has a storage capacity of 8,000 acre-feet and serves the purposes of irrigation and water supply. The dam has a high hazard potential but was deemed to be in satisfactory condition during its last assessment in September 2017.
Managed by the California Department of Water Resources (DWR) under the Safety of Dams program, Hog Flat undergoes regular inspections, with the last one taking place in September 2020. Despite its age, the dam continues to play a crucial role in water resource management in the region, providing essential water supply for agricultural and domestic use. The structure has a spillway type and width, but further details on its design and construction are not provided in the data.
Hog Flat's historical significance as a water storage facility underscores its importance in the local ecosystem and highlights the ongoing efforts to maintain its integrity in the face of changing climate conditions. As a key infrastructure supporting the community's water needs, this dam serves as a reminder of the delicate balance between water resource management and environmental conservation in the face of evolving climate challenges.
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 Hog Flat -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Spanish C Ab Blackhawk C At Keddie Ca | 118 cfs | → |
| Hat C Nr Hat Creek Ca | 186 cfs | → |
| Spanish C A Quincy Ca | 58 cfs | → |
| Pit R Bl Pit No 1 Ph Nr Fall River Mills Ca | 1,210 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Hog Flat.
Boat launches
Campgrounds
Fishing spots
Paddle runs
- Susan River
- 1 Mile West Of Devil's Corral To To Susanville
- Willow Creek
- Within Tunnison Wsa To Within Tunnison Wsa
- Pond In Sec 35, T26n, R9e To Confluence With Spanish Creek
More reservoirs
Track Hog Flat 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 Hog Flat
Where does the data for Hog Flat 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 Hog Flat.