Anderson Dam 809 Reservoir Report

Last Updated: December 13, 2025

Anderson Dam 809 is a privately owned earth dam located in Valentine, Nebraska, along the TR-NIOBRARA RIVER.


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Summary

Built in 1950 by the USDA NRCS, this dam primarily serves the purpose of irrigation, with a storage capacity of 373 acre-feet and a drainage area of 21.4 square miles. The dam stands at a height of 33 feet and spans a length of 700 feet, making it a crucial water resource infrastructure in the region.

Managed by the Nebraska Department of Natural Resources, Anderson Dam 809 has a low hazard potential and is currently rated as 'Not Rated' in terms of its condition assessment. The dam undergoes regular inspections every five years, with the last inspection conducted in September 2019. Although the dam has not been modified in recent years, it remains a key component of the local water management system, ensuring water availability for irrigation purposes while mitigating flood risks in the area. With its strategic location and design, Anderson Dam 809 plays a vital role in sustaining water resources and supporting agricultural activities in Dawes County, Nebraska.

Year Completed

1950

Dam Length

700

Dam Height

23

River Or Stream

TR-NIOBRARA RIVER

Primary Dam Type

Earth

Surface Area

28

Hydraulic Height

21

Drainage Area

21.4

Nid Storage

373

Structural Height

33

Hazard Potential

Low

Foundations

Soil

Nid Height

33
       
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.
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Area Campgrounds