Rosa Dam Reservoir Report

Last Updated: December 8, 2025

Rosa Dam, located in Harvey, Iowa, is a private earth dam constructed in 2001 by the NRCS for fire protection, stock, and small fish pond purposes.


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Summary

With a height of 33 feet and a length of 300 feet, this dam has a storage capacity of 37 acre-feet and serves the TR- English Creek. It is regulated by the Iowa DNR and has a low hazard potential, rated as moderate risk (3).

Despite being a privately owned structure, Rosa Dam is subject to state jurisdiction, permitting, inspection, and enforcement. It has a spillway width of 1 foot and is designed for uncontrolled spillway discharge. The dam's condition is currently not rated, and there is no Emergency Action Plan (EAP) in place. With a surface area of 2.7 acres and a drainage area of 0.06 square miles, the dam plays a crucial role in water resource management in Lucas County, Iowa.

Water resource and climate enthusiasts will find Rosa Dam intriguing for its design, purpose, and risk assessment. As a vital infrastructure for fire protection and livestock management, this earth dam contributes to the local ecosystem while also posing a moderate risk that requires ongoing management measures. Its location on TR- English Creek and association with the NRCS make it a significant feature in the water management landscape of Iowa, highlighting the intersection of human development and environmental conservation.

Year Completed

2001

Dam Length

300

Dam Height

33

River Or Stream

TR- ENGLISH CREEK

Primary Dam Type

Earth

Surface Area

2.7

Drainage Area

0.06

Nid Storage

37

Hazard Potential

Low

Foundations

Soil

Nid Height

33
       
Seasonal Comparison

Weather Forecast

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. 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

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, 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.