Niacc Dam Reservoir Report
Last Updated: March 10, 2026
Niacc Dam, located in Cerro Gordo County, Iowa, along the TR-IDEAL CREEK, was completed in 1973 and stands at a height of 24 feet and a length of 325 feet.
Summary
Owned and regulated by the state of Iowa, the dam serves multiple purposes including recreation, fire protection, stock, and small fish pond. With a storage capacity of 65 acre-feet, the dam covers a surface area of 4 acres and drains a 0.05 square mile watershed.
Managed by the Iowa Department of Natural Resources, Niacc Dam has a low hazard potential and a moderate risk assessment rating. The dam is primarily an earth structure with a soil foundation and an uncontrolled spillway. It is designed for recreational activities and is inspected, permitted, and enforced by state regulatory agencies. The dam's location in Portland, Iowa, makes it a valuable resource for water recreation enthusiasts and climate conservationists interested in the sustainable management of water resources.
Despite its low hazard potential, Niacc Dam plays a crucial role in providing recreational opportunities and supporting local ecosystems in the area. With its historical significance and environmental impact, the dam serves as a reminder of the importance of responsible stewardship of water resources and the need for ongoing monitoring and maintenance to ensure the safety and sustainability of our natural surroundings.
°F
°F
mph
Wind
%
Humidity
15-Day Weather Outlook
Year Completed |
1973 |
Dam Length |
325 |
Dam Height |
24 |
River Or Stream |
TR-IDEAL CREEK |
Primary Dam Type |
Earth |
Surface Area |
4 |
Drainage Area |
0.05 |
Nid Storage |
65 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
24 |
Seasonal Comparison
5-Day Hourly Forecast Detail
Nearby Streamflow Levels
Winnebago River At Mason City
|
738cfs |
Cedar River At Charles City
|
1330cfs |
Little Cedar River Near Ionia
|
366cfs |
Cedar River Near Austin
|
477cfs |
Iowa River Near Rowan
|
809cfs |
Shell Rock River At Shell Rock
|
3160cfs |
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.
Niacc Dam