Hoherz Dam; Anna Reservoir Report

Last Updated: December 7, 2025

Hoherz Dam; Anna, located in Hettinger, North Dakota, is a privately owned earth dam designed by USFWS for the primary purpose of serving as a Fish and Wildlife Pond.


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Summary

Completed in 1960, this dam stands at a height of 11 feet and has a length of 382 feet, with a storage capacity of 70 acre-feet. The dam, situated on the Cannonball-Tr river, has a surface area of 8.5 acres and a drainage area of 16.3 square miles.

Despite its low hazard potential and moderate risk assessment, Hoherz Dam; Anna has not been rated for its condition. With a spillway width of 115 feet and an uncontrolled spillway type, this dam has a vertical lift outlet gate. It underwent structural modifications in 1992 to ensure its continued functionality. Although the dam is not under the jurisdiction of any federal agency, it is regulated by the NDSWC, with state inspections and enforcement in place to ensure its safety and compliance with regulations. Overall, Hoherz Dam; Anna serves as an important water resource for the Fish and Wildlife Pond, contributing to the conservation efforts in the area.

Years Modified

1992 - Structural

Year Completed

1960

Dam Length

382

Dam Height

11

River Or Stream

CANNONBALL-TR

Primary Dam Type

Earth

Surface Area

8.5

Drainage Area

16.3

Nid Storage

70

Outlet Gates

Vertical Lift - 1

Hazard Potential

Low

Foundations

Soil

Nid Height

11
       
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.