Lynnville Dam Reservoir Report
Nearby: Van Zante Dam Vander Molen Dam
Last Updated: December 14, 2025
Lynnville Dam, located in Jasper County, Iowa, serves as a recreational site along the North Skunk River.
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Summary
Constructed in 1918, this gravity dam stands at 12 feet high and stretches 84 feet in length, with a storage capacity of 200 acre-feet. The dam's primary purpose is for recreation, offering visitors a scenic spot to enjoy outdoor activities such as boating, fishing, and picnicking.
Managed by the Iowa Department of Natural Resources, Lynnville Dam is regulated, inspected, and enforced by state agencies to ensure its safety and functionality. Despite its low hazard potential, the dam is classified as having a moderate risk level, indicating the need for ongoing risk management measures. While not currently rated for its condition, the dam remains a popular destination for water resource and climate enthusiasts seeking a picturesque setting to appreciate the intersection of human infrastructure and natural landscapes.
Year Completed |
1918 |
Dam Length |
84 |
Dam Height |
12 |
River Or Stream |
NORTH SKUNK RIVER |
Primary Dam Type |
Gravity |
Surface Area |
33 |
Drainage Area |
287 |
Nid Storage |
200 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
12 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
South Skunk River Near Oskaloosa
|
485cfs |
Des Moines River Near Pella
|
2440cfs |
Des Moines River Near Tracy
|
1400cfs |
English Creek Near Knoxville
|
2cfs |
South Skunk River At Colfax
|
211cfs |
Cedar Creek Near Bussey
|
11cfs |
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.
Lynnville Dam