Tiger Creek Afterbay dam
Tiger Creek Afterbay
Tiger Creek Afterbay, located in Pioneer, California, is a privately owned hydroelectric facility situated on the North Fork Mokelumne River. The dam, completed in 1931, stands at a height of 120 feet and has a storage capacity of 2,610 acre-feet. With a maximum discharge of 194,370 cubic feet per second, the controlled spillway, measuring 292 feet wide, ensures efficient water release during high flow events.
Managed by the Federal Energy Regulatory Commission, Tiger Creek Afterbay has a high hazard potential due to its structural height and proximity to populated areas. The facility boasts 10 radial Tainter gates for water control, ensuring the safety and stability of the dam. Despite its age, the dam's condition assessment is not currently available, highlighting the importance of regular inspections and maintenance to mitigate risks associated with its very high risk rating.
Water resource and climate enthusiasts will be fascinated by Tiger Creek Afterbay's historical significance and vital role in hydroelectric power generation. As a key component of California's water infrastructure, the facility's efficient design and regulated operation showcase the intersection of human ingenuity and environmental stewardship. With a strong emphasis on safety and risk management measures, Tiger Creek Afterbay stands as a testament to the ongoing efforts to balance water resource utilization with conservation and public safety 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 Tiger Creek Afterbay -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Deer C Nr Cameron Park Ca | 8 cfs | → |
| Cosumnes R A Michigan Bar Ca | 358 cfs | → |
| Pilot C Ab Stumpy Meadows Res Ca | 3 cfs | → |
| Black C Nr Copperopolis Ca | 1 cfs | → |
| Pilot C Bl Mutton Canyon Nr Georgetown Ca | 2 cfs | → |
| Upper Truckee R At S Upper Truckee Rd Nr Meyers Ca | 4 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Tiger Creek Afterbay .
Boat launches
- Sly Park Road, Pollock Pines
- Amador County
- Forebay Road El Dorado County
- Poho Ridge El Dorado County
- Rock Creek Road El Dorado County
- Junction Boat Ramp Road El Dorado County
Campgrounds
- Indian Grinding Rock State Park
- Indian Grinding Rock Campground
- Sly Guard Cabin
- Pipi Campground
- Pipi
- Frontier Adventure
Fishing spots
- Lake Tabeaud
- Lower Bear River Reservoir
- Bear River Reservoir
- Salt Springs Reservoir
- Pardee Reservoir
- Amador Lake
Track Tiger Creek Afterbay 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 Tiger Creek Afterbay
Where does the data for Tiger Creek Afterbay 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 Tiger Creek Afterbay .