Phillips Subwatershed Site 3250 Reservoir Report
Last Updated: December 13, 2025
Phillips Subwatershed Site 3250 is a crucial water resource located in Monona County, Iowa, specifically in the city of Castana.
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Summary
This site, managed by the local government, serves multiple purposes including fire protection, stock watering, and small fish pond maintenance. The earth dam, constructed in 1956, stands at a height of 53 feet and has a storage capacity of 38 acre-feet. The dam primarily regulates the flow of the TR-Maple River, contributing to flood risk reduction in the area.
Despite being rated as having a low hazard potential, Phillips Subwatershed Site 3250 is deemed to have moderate risk, with the condition assessment currently labeled as not rated. The dam has not been inspected in recent times, raising concerns about its structural integrity and overall safety. While the site meets state regulatory requirements, there is a need for regular inspections and maintenance to ensure that it continues to serve its intended purposes effectively. Climate enthusiasts and water resource advocates can engage with local authorities to prioritize the safety and maintenance of this important infrastructure.
Year Completed |
1956 |
Dam Height |
53 |
River Or Stream |
TR- MAPLE RIVER |
Primary Dam Type |
Earth |
Surface Area |
1 |
Drainage Area |
0.12 |
Nid Storage |
38 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
53 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Maple River At Mapleton
|
323cfs |
Little Sioux River Near Turin
|
1040cfs |
Monona-Harrison Ditch Near Turin
|
158cfs |
West Fork Ditch At Hornick
|
80cfs |
Soldier River At Pisgah
|
112cfs |
Missouri River At Decatur
|
15500cfs |
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.
Phillips Subwatershed Site 3250