Mc Masters Subwatershed 2703 Reservoir Report
Last Updated: December 14, 2025
Mc Masters Subwatershed 2703, located in Monona, Iowa, is a crucial water resource managed by the local government and regulated by the Iowa Department of Natural Resources.
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Summary
This subwatershed is situated along the TR- Little Sioux River and serves multiple purposes including fire protection, stock maintenance, small fish pond, and flood risk reduction. The primary dam type in this subwatershed is earth, with a dam height of 32 feet and a storage capacity of 37 acre-feet.
Constructed in 1955, Mc Masters Subwatershed 2703 covers a drainage area of 0.21 square miles with a surface area of 3 acres. Despite its low hazard potential, the subwatershed has a moderate risk assessment rating. The condition assessment of this water resource is currently not rated, but it undergoes state inspection and enforcement regularly. The subwatershed also meets state permitting requirements, ensuring its compliance with environmental regulations and safety standards.
Overall, Mc Masters Subwatershed 2703 plays a vital role in water management and flood control in the region. With its strategic location and effective design by the USDA NRCS, this subwatershed serves as a valuable asset for the community while also addressing the need for water conservation and climate resilience in Monona, Iowa.
Year Completed |
1955 |
Dam Height |
32 |
River Or Stream |
TR- LITTLE SIOUX RIVER |
Primary Dam Type |
Earth |
Surface Area |
3 |
Drainage Area |
0.21 |
Nid Storage |
37 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
32 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
West Fork Ditch At Hornick
|
80cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
Missouri River At Decatur
|
14900cfs |
Soldier River At Pisgah
|
112cfs |
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.
Mc Masters Subwatershed 2703