Hendrickson Dam; Alan 2 Reservoir Report
Last Updated: December 6, 2025
Hendrickson Dam; Alan 2, also known as Wetland 1, is a privately owned structure located in Dunn, North Dakota.
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Summary
Constructed in 1998, this Earth-type dam serves primarily as a Fish and Wildlife Pond with a storage capacity of 81 acre-feet. The dam stands at a height of 10 feet and stretches 365 feet in length, covering a surface area of 13 acres and draining an area of 4.3 square miles.
Managed by the North Dakota State Water Commission (NDSWC), Hendrickson Dam; Alan 2 has a low hazard potential and a moderate risk rating. The dam features an uncontrolled spillway with a width of 75 feet and is equipped with a single vertical lift outlet gate. Despite its condition being labeled as 'Not Rated' in terms of assessment, the structure is subject to regular state inspection, permitting, and enforcement to ensure its safety and compliance with regulatory standards.
For water resource and climate enthusiasts, Hendrickson Dam; Alan 2 offers a fascinating example of how private initiatives contribute to wildlife conservation and habitat preservation. The dam's role as a Fish and Wildlife Pond not only provides essential water storage but also creates a thriving ecosystem for local flora and fauna in the Knife-TR river basin. With proper management and oversight, this structure serves as a valuable asset in maintaining ecological balance and supporting biodiversity in the region.
Year Completed |
1998 |
Dam Length |
365 |
Dam Height |
10 |
River Or Stream |
KNIFE-TR |
Primary Dam Type |
Earth |
Surface Area |
13 |
Drainage Area |
4.3 |
Nid Storage |
81 |
Outlet Gates |
Vertical Lift - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
10 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
Knife River At Manning
|
2cfs |
Knife River Nr Golden Valley
|
27cfs |
Spring Creek At Zap
|
5cfs |
Green River Nr New Hradec
|
1cfs |
Heart River Nr South Heart
|
6cfs |
Heart River Nr Richardton
|
17cfs |
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.
Hendrickson Dam; Alan 2