Rice #1 dam
Rice #1
Rice #1, also known as Jordan Pond, is a Federal-owned recreational facility located in Mariposa, California. Built in 1950, this earth dam stands at a height of 25 feet and stretches for 300 feet along Jordan Creek. While primarily used for recreation, the dam also serves as a fish and wildlife pond.
With a significant hazard potential and a moderate risk assessment score of 3, Rice #1 has not been rated for its condition assessment. The dam does not have a Emergency Action Plan (EAP) prepared, and its last inspection was conducted in October 2015. Despite these concerns, the dam has not been modified in recent years and is currently under the jurisdiction of the Forest Service.
Water resource and climate enthusiasts may find Rice #1 to be an intriguing case study, given its historical significance and potential risks associated with its operation. The dam's location in the San Francisco District, along with its unique design features such as an uncontrolled spillway, offer valuable insights into the management of water resources in the region. As efforts are made to address the dam's hazard potential and improve its risk management measures, Rice #1 continues to stand as a testament to the importance of maintaining and monitoring critical infrastructure for the benefit of both humans and wildlife.
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 Rice #1 -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Big C Ab Whites Gulch Nr Groveland Ca | · | → |
| Tuolumne R Bl Early Intake Nr Mather Ca | 136 cfs | → |
| Cherry C Bl Dion R Holm Ph | 80 cfs | → |
| Tuolumne R Ab Early Intake Nr Mather Ca | 119 cfs | → |
| Cherry C Nr Early Intake Ca | 40 cfs | → |
| Cherry C Bl Valley Dam Nr Hetch Hetchy Ca | 16 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Rice #1.
Boat launches
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Campgrounds
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Fishing spots
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River runs
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About Rice #1
Where does the data for Rice #1 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 Significant 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 below 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.
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.