Mononame 12 Reservoir Report
Nearby: Gard Lake Dam Keller Lake Dam
Last Updated: December 19, 2025
Mononame 12, located in Marion County, Missouri, is a privately owned earth dam constructed in 1966 primarily for irrigation purposes.
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Summary
The dam stands at a height of 20 feet and has a storage capacity of 54 acre-feet. With a surface area of 5 acres and a drainage area of 89 square miles, Mononame 12 plays a vital role in water resource management in the region.
Although the dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment, it has not been subjected to recent inspections or maintenance activities. Despite its lack of state regulation or permitting, the dam serves as a key infrastructure for irrigation and recreational activities in the area. With its strategic location along the TR North River, Mononame 12 contributes to the overall water management system in the region and highlights the importance of private ownership in water resource development and utilization.
As climate change continues to impact water availability and quality, the maintenance and monitoring of dams like Mononame 12 become increasingly important. With its historical significance and contribution to irrigation and recreation, the dam serves as a reminder of the need for ongoing investment in water infrastructure to ensure sustainable water management practices in the face of changing environmental conditions.
Year Completed |
1966 |
Dam Height |
20 |
River Or Stream |
TR NORTH RIVER |
Primary Dam Type |
Earth |
Surface Area |
5 |
Drainage Area |
89 |
Nid Storage |
54 |
Structural Height |
20 |
Hazard Potential |
Low |
Foundations |
Unlisted/Unknown |
Nid Height |
20 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North River At Palmyra
|
17cfs |
South Fabius River Near Taylor
|
12cfs |
Bear Creek At Hannibal
|
2cfs |
Salt River Near New London
|
106cfs |
Wyaconda River Above Canton
|
13cfs |
Salt River Near Center
|
57cfs |
Dam Data Reference
Condition Assessment
SatisfactoryNo 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. Note: Rare or extreme event is defined by the regulatory agency based on their minimum
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. Investigations and studies are necessary.
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.
Not Available
Dams for which the condition assessment is restricted to approved government users.
Hazard Potential Classification
HighDams 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, environment 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.
Not Available
Dams for which the downstream hazard potential is restricted to approved government users.
Mononame 12