Herzog Dam Reservoir Report

Last Updated: December 13, 2025

Herzog Dam, also known as Tongue River WS Dam T3-6, is a local government-owned structure in Pembina, North Dakota, designed by the USDA NRCS.


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Summary

Completed in 1957, this earth dam stands at a height of 38 feet with a structural height of 46 feet and a length of 794 feet. It serves the primary purpose of flood risk reduction along the Tongue River-TR, with a normal storage capacity of 80 acre-feet and a maximum storage of 2,430 acre-feet. The dam features an uncontrolled spillway with a width of 450 feet and a single slide (sluice gate) outlet gate.

Given its location in a significant hazard potential area, Herzog Dam has undergone a structural modification in 1985 to enhance its resilience. The dam is under the regulatory oversight of the North Dakota State Water Commission (NDSWC), ensuring regular inspections, permitting, and enforcement to maintain its safety and functionality. Although the condition assessment is not rated, the risk assessment categorizes the dam's risk level as moderate, indicating the need for ongoing risk management measures. While no Emergency Action Plan (EAP) details are provided, the dam's emergency preparedness and communication protocols are critical for effective response in case of potential inundation events. This dam serves as a vital infrastructure for flood control and water resource management in the region, highlighting the importance of sustainable dam operations and maintenance for climate resilience.

Years Modified

1985 - Structural

Year Completed

1957

Dam Length

794

Dam Height

38

River Or Stream

TONGUE RIVER-TR

Primary Dam Type

Earth

Surface Area

18.4

Drainage Area

16.65

Nid Storage

2430

Structural Height

46

Outlet Gates

Slide (sluice gate) - 1

Hazard Potential

Significant

Foundations

Rock, Soil

Nid Height

46
       
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.