Bob Dixon No.1 Reservoir Report
Nearby: Helen Dixon No. 2 Boggy
Last Updated: December 6, 2025
Bob Dixon No.1 is a privately owned irrigation dam located in Niobrara, Wyoming, along the S Snyder Creek.
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Summary
Built in 1959, this earth dam stands at 42 feet high and has a hydraulic height of 37 feet, serving the primary purpose of irrigation. Despite its low hazard potential, the dam is assessed to be in poor condition as of the last inspection in August 2019, with a moderate risk assessment rating.
The dam has a storage capacity of 989 acre-feet, with a surface area of 60 acres and a spillway width of 100 feet. While it has one slide gate for outlet control, the dam lacks drainage area and has not been modified in recent years. Managed by the Wyoming State Engineering Office, the dam is subject to regular state regulation, inspection, and enforcement to ensure its safety and compliance with standards.
Located in Edgemont, SD, this dam is under the jurisdiction of the Omaha District and falls within Congressional District 00 of Wyoming, represented by Liz Cheney. Despite its aging infrastructure and poor condition assessment, Bob Dixon No.1 remains a vital water resource for irrigation in the region, highlighting the importance of ongoing maintenance and risk management measures to safeguard its operations and surrounding community.
Year Completed |
1959 |
Dam Length |
580 |
Dam Height |
42 |
River Or Stream |
S SNYDER CREEK |
Primary Dam Type |
Earth |
Surface Area |
60 |
Hydraulic Height |
37 |
Nid Storage |
989 |
Structural Height |
42 |
Outlet Gates |
Slide (sluice gate) - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
42 |
Seasonal Comparison
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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.
Bob Dixon No.1