Clarence Cannon Dam - Saddle Dam dam
Clarence Cannon Dam - Saddle Dam
The Clarence Cannon Dam - Saddle Dam, also known as Mark Twain Lake, is a key federal infrastructure designed for flood risk reduction in Ralls, Missouri. Completed in 1983 by the US Army Corps of Engineers, this earth dam stands at a height of 14 feet and spans a length of 2200 feet along the Salt River. With a storage capacity of 1,862,000 acre-feet, the dam plays a crucial role in managing water levels and mitigating flood risks in the region.
Despite its high hazard potential, the US Army Corps of Engineers implements rigorous risk management measures to ensure the dam's safety and functionality. This includes regular inspections, monitoring the dam's condition, and engaging with local emergency managers and the public to raise awareness and preparedness for potential dam-related emergencies. The agency continually updates the emergency action plan and conducts maintenance and repairs as needed to uphold the dam's structural integrity. As climate change brings increased variability in weather patterns, the importance of effective dam management and risk mitigation strategies becomes ever more critical in safeguarding communities and water resources.
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 Clarence Cannon Dam - Saddle Dam -- inflows here typically show up in storage 24-72 hours later.
| Streamgauge | Discharge | View |
|---|---|---|
| Salt River Near Center | 1,620 cfs | → |
| Lick Creek At Perry | 18 cfs | → |
| Salt River Near New London | 1,340 cfs | → |
| Bear Creek At Hannibal | 1 cfs | → |
| Long Branch Near Santa Fe | 13 cfs | → |
| Spencer Cr. Bl Plum Cr. Nr Frankford | 44 cfs | → |
Make a day of it
Boat launches, lakeside camping, fishing access, and other reservoirs near Clarence Cannon Dam - Saddle Dam.
Track Clarence Cannon Dam - Saddle 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 Clarence Cannon Dam - Saddle Dam
Where does the data for Clarence Cannon Dam - Saddle 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 Clarence Cannon Dam - Saddle Dam.