Leech Hollow Subwatershed Site C-5 Reservoir Report
Last Updated: December 15, 2025
Leech Hollow Subwatershed Site C-5 is a low hazard potential earth dam located in Monona, Iowa, specifically in the city of Castana.
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Summary
Completed in 1978, this dam stands at a height of 51 feet and spans a length of 380 feet, with a storage capacity of 36 acre-feet. The primary purpose of this structure is for fire protection, stock, or small fish pond, as well as flood risk reduction and recreation.
Managed by local government authorities, Leech Hollow Subwatershed Site C-5 is regulated, permitted, inspected, and enforced by the Iowa Department of Natural Resources. The dam is situated on TR-McClarey Creek and falls under the jurisdiction of the Rock Island District of the US Army Corps of Engineers. Despite its moderate risk assessment rating, the condition of the dam is currently not rated, and there are no emergency action plans or inundation maps prepared for this site.
Water resource and climate enthusiasts interested in the Leech Hollow Subwatershed Site C-5 will appreciate the detailed information provided about this earth dam, including its construction, purpose, location, and regulatory oversight. With a focus on safety and risk management, this summary highlights key data points such as storage capacity, drainage area, and hazard potential, giving insight into the importance of maintaining and monitoring critical infrastructure for water resource management in the region.
Year Completed |
1978 |
Dam Length |
380 |
Dam Height |
51 |
River Or Stream |
TR-MC CLAREY CREEK |
Primary Dam Type |
Earth |
Surface Area |
1.2 |
Drainage Area |
0.15 |
Nid Storage |
36 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
51 |
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 |
Little Sioux River At Correctionville
|
327cfs |
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.
Leech Hollow Subwatershed Site C-5