Mark Edson dam
Mark Edson
Mark Edson, also known as Stumpy Meadows Reservoir, is a key water resource located in El Dorado County, California. Managed by a public utility, this dam serves various purposes including irrigation, recreation, and water supply. With a height of 162 feet and a hydraulic height of 152 feet, the dam was completed in 1962 and holds a storage capacity of 20,000 acre-feet.
Situated on Pilot Creek, Mark Edson plays a crucial role in the water supply infrastructure of the region. With a surface area of 330 acres and a drainage area of 15.6 square miles, the reservoir is regulated and inspected by the California Department of Water Resources for safety and enforcement. Despite its high hazard potential, the dam has been assessed as satisfactory in condition as of September 2017.
With its strategic location in Folsom, California, Mark Edson serves as a vital component in ensuring water supply reliability for the surrounding communities. The dam's emergency action plan was last revised in March 2021 to meet guidelines for risk management and preparedness in case of any unforeseen events. For water resource and climate enthusiasts, Mark Edson represents a fascinating case study in dam infrastructure and water management practices.
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 Mark Edson -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Pilot C Ab Stumpy Meadows Res Ca | 3 cfs | → |
| Pilot C Bl Mutton Canyon Nr Georgetown Ca | 2 cfs | → |
| Nf American R A North Fork Dam Ca | 773 cfs | → |
| Blackwood C Nr Tahoe City Ca | 87 cfs | → |
| General C Nr Meeks Bay Ca | 16 cfs | → |
| Deer C Nr Cameron Park Ca | 8 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Mark Edson.
Boat launches
- Poho Ridge El Dorado County
- Forebay Road El Dorado County
- Junction Boat Ramp Road El Dorado County
- Oxbow Raft Put-In Site
- Dry Lakes Trail El Dorado County
- Sly Park Road, Pollock Pines
Campgrounds
- Ponderosa Cove
- Ponderosa Cove Group Campground
- Stumpy Meadows Campground
- Stumpy Meadows
- Black Oak Group Campground
- Black Oak Campground
Fishing spots
- Stumpy Meadows Lake
- Union Valley Reservoir
- Ice House Reservoir
- French Meadows Reservoir
- Loon Lake
- Buck Island Lake
Paddle runs
- Big Grizzly Canyon To Oxbow Reservoir
- Ellicots Bridge To Big Grizzly Canyon
- Interbay To Oxbow (End Of The World)
- Tunnel Run (Ralston Powerhouse To Greenwood)
- Hell Hole Dam To Ellicotts Bridge
- South Fork American River
More reservoirs
Track Mark Edson 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 Mark Edson
Where does the data for Mark Edson 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 Mark Edson.