Trulson F Pond Reservoir Report

Last Updated: December 6, 2025

Trulson F Pond, also known as Trulson Dam, is a privately owned dam located in Isanti, Minnesota along the Sunrise River North Branch.


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Summary

Built in 1970 by the USDA NRCS, this earth dam stands at a height of 12 feet and has a length of 100 feet, with a primary purpose classified as 'Other'. The dam has a maximum storage capacity of 80 acre-feet and a normal storage capacity of 70 acre-feet, serving as a critical water resource for the area.

Managed by the Minnesota Department of Natural Resources, Trulson F Pond is regulated, permitted, inspected, and enforced by the state to ensure its safety and functionality. Despite being classified as having a low hazard potential with a satisfactory condition assessment, the dam is considered to have a moderate risk level. Emergency action plans and risk management measures are under review, highlighting the importance of ongoing monitoring and maintenance to mitigate potential risks related to the dam.

Located in a picturesque setting in Branch, Minnesota, Trulson F Pond offers a glimpse into the intersection of water resource management and climate resilience. With its unique design and historical significance, this dam serves as a reminder of the importance of sustainable infrastructure development to adapt to changing environmental conditions and safeguard water resources for future generations.

Year Completed

1970

Dam Length

100

Dam Height

12

River Or Stream

SUNRISE RIVER N BRANCH

Primary Dam Type

Earth

Drainage Area

0.7

Nid Storage

80

Structural Height

13

Outlet Gates

Uncontrolled

Hazard Potential

Low

Foundations

Unlisted/Unknown

Nid Height

13
       
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.