Jansen Dam Reservoir Report

Last Updated: December 13, 2025

Jansen Dam, located in Lynnville, Iowa, is a privately owned earth dam completed in 2006 with a primary purpose of fire protection, stock, or small fish pond.


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Summary

With a height of 24 feet and a length of 312 feet, the dam has a storage capacity of 57 acre-feet and serves the North Skunk River. The dam is regulated by the Iowa Department of Natural Resources and undergoes regular inspections, enforcement, and permitting to ensure its safety and compliance with state regulations.

Despite being classified as having low hazard potential, Jansen Dam is considered to have a moderate risk level with a risk assessment rating of 3. The dam features an uncontrolled spillway with a width of 1 foot and is situated in a drainage area of 0.24 square miles. While the dam does not have outlet gates or associated structures, it plays a crucial role in providing fire protection and supporting local agriculture by serving as a stock or small fish pond. With its strategic location and function, Jansen Dam contributes to water resource management efforts in the region and showcases the importance of sustainable infrastructure development in mitigating climate impacts.

Year Completed

2006

Dam Length

312

Dam Height

24

River Or Stream

TR-NORTH SKUNK RIVER

Primary Dam Type

Earth

Surface Area

4

Drainage Area

0.24

Nid Storage

57

Hazard Potential

Low

Foundations

Soil

Nid Height

24
       
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.
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