New Hogan Dam dam
New Hogan Dam
New Hogan Dam, located in California along the Calaveras River, serves as a crucial flood risk reduction structure that provides multiple benefits to the surrounding communities. Completed in 1963 by the US Army Corps of Engineers, this rockfill dam stands at a height of 210 feet and has a storage capacity of up to 348,598 acre-feet. While the dam has historically performed well in reducing the risk of flooding to downstream areas, a 2006 risk assessment highlighted potential concerns, such as the lack of spillway adequacy and the possibility of dam deformations during a major earthquake.
To manage these risks, USACE closely collaborates with local emergency managers, regularly updates emergency action plans, and conducts drills to enhance preparedness. The full-time staff at New Hogan Dam ensures regular maintenance and immediate inspections in case of any unusual events. By incorporating weather forecasts and monitoring localized flows, USACE can make informed decisions on dam operations to mitigate potential threats to downstream communities. While the scenarios of dam failure are considered extremely unlikely, the emergency action plan for New Hogan Dam is in place to lower the risk of life loss and protect the surrounding infrastructure from significant flooding impacts.
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 New Hogan Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Black C Nr Copperopolis Ca | 1 cfs | → |
| Cosumnes R A Michigan Bar Ca | 168 cfs | → |
| Stanislaus R A Ripon Ca | 1,330 cfs | → |
| Deer C Nr Cameron Park Ca | 8 cfs | → |
| Laguna C Nr Elk Grove Ca | 1 cfs | → |
| Little Potato Slough A Terminous Ca | 7,590 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near New Hogan Dam.
Campgrounds
- Acorn - New Hogan Lake
- Acorn Campground
- Oak Knoll - New Hogan Lake
- Gold Strike Village Campers
- Frogtown Rv Park
- Gloryhole Rec Area- Ironhorse - Usbr
Fishing spots
Paddle runs
- Mokelumne River
- North Fork Mokelumne River
- Confluence With North Fork And Middle Fork Stanislaus To Clark Flat
- Sandbar To Confluence With North Fork Stanislaus River
More reservoirs
Track New Hogan Dam 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 New Hogan Dam
Where does the data for New Hogan Dam 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 New Hogan Dam.