Middle Br. Park River #6 Reservoir Report

Last Updated: December 7, 2025

Middle Br.


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Summary

Park River #6, also known as Sundvor Dam, is a vital structure owned by the local government in North Dakota. Designed by USDA NRCS, this earth dam stands at a height of 49.2 feet and was completed in 1974 for the primary purpose of flood risk reduction along the Middle Branch Park River. With a storage capacity of 724.7 acre-feet and a surface area of 6.5 acres, this dam plays a crucial role in safeguarding the surrounding area from potential flooding events.

Situated in Walsh County, North Dakota, this dam is regulated by the NDSWC and undergoes state inspections, permitting, and enforcement to ensure its structural integrity and functionality. With a spillway width of 200 feet and a significant hazard potential, Middle Br. Park River #6 is a key component in managing water flow and reducing flood risks in the region. Although the dam's condition assessment is not rated, it continues to serve its purpose effectively, with a moderate risk assessment rating of 3.

Overall, Middle Br. Park River #6 stands as a testament to successful collaboration between federal and local agencies in mitigating flood risks and protecting communities along the Middle Branch Park River. As water resource and climate enthusiasts, understanding the design, purpose, and regulatory oversight of such structures is crucial in appreciating the vital role they play in maintaining water security and resilience against natural disasters.

Year Completed

1974

Dam Length

500

Dam Height

49.2

River Or Stream

MIDDLE BRANCH PARK RIVER

Primary Dam Type

Earth

Surface Area

6.5

Drainage Area

4.2

Nid Storage

724.7

Structural Height

58

Outlet Gates

None

Hazard Potential

Significant

Foundations

Soil

Nid Height

58
       
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.