Johnson Dam 672 Reservoir Report
Nearby: Tallon Dam Glen Forney Dam
Last Updated: December 12, 2025
Johnson Dam 672, located in Sheridan, Nebraska, is a privately owned structure designed by the USDA NRCS for flood risk reduction along the TR-Whiteclay Creek.
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Summary
Completed in 1969, this earth dam stands at a height of 25.4 feet and has a storage capacity of 288.5 acre-feet, serving a drainage area of 5.74 square miles. Despite its low hazard potential, the dam's condition assessment is marked as poor as of May 2020.
Managed by the Nebraska Department of Natural Resources, Johnson Dam 672 is subject to state regulation, permitting, inspection, and enforcement to ensure its safety and functionality. While its primary purpose is flood risk reduction, the dam also serves as a crucial infrastructure for water resource management in the region. With a surface area of 19.2 acres and a normal storage capacity of 112.4 acre-feet, the dam plays a vital role in mitigating the impact of extreme weather events on the surrounding area.
Although Johnson Dam 672 has faced challenges in terms of its condition assessment, ongoing inspections and regulatory measures aim to address these issues and maintain the dam's integrity. As a key component of the flood risk reduction strategy in Sheridan, Nebraska, this structure highlights the importance of proactive management and investment in water resource infrastructure to safeguard communities and ecosystems against the impacts of climate change.
Year Completed |
1969 |
Dam Length |
360 |
Dam Height |
25.4 |
River Or Stream |
TR-WHITECLAY CREEK |
Primary Dam Type |
Earth |
Surface Area |
19.2 |
Hydraulic Height |
25.4 |
Drainage Area |
5.74 |
Nid Storage |
288.5 |
Structural Height |
25.4 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Johnson Dam 672