Clark No. 1 Reservoir Report
Nearby: Amelia No. 1 Leonard Degering
Last Updated: December 6, 2025
Clark No.
°F
°F
mph
Wind
%
Humidity
Summary
1, located in Niobrara, Wyoming, is a privately-owned earth dam constructed in 1959 for irrigation purposes along ALUM CREEK. Standing at 25 feet high with a spillway width of 250 feet, this structure has a storage capacity of 496 acre-feet and a surface area of 39 acres. Despite its low hazard potential, the dam's condition assessment in 2019 rated as poor, highlighting the need for maintenance and potential improvements to ensure its long-term stability.
Managed by the SEO agency in Wyoming, Clark No. 1 is subject to state regulation, permitting, inspection, and enforcement. The dam's last inspection in November 2019 revealed its poor condition, prompting a moderate risk assessment and raising concerns about its structural integrity. The presence of an uncontrolled spillway and a single valve for outlet gates further underscores the importance of regular monitoring and maintenance to mitigate potential risks associated with the dam.
With Liz Cheney (R) representing the Congressional District 00 in Wyoming, stakeholders involved in water resource management and climate adaptation should closely monitor the condition of Clark No. 1. As climate change continues to impact water availability and infrastructure resilience, ensuring the safety and functionality of dams like Clark No. 1 is crucial for sustainable water management and agricultural practices in the region. Collaborative efforts between private owners, regulatory agencies, and local communities will be essential in addressing the dam's poor condition and implementing risk management measures to protect surrounding areas from potential hazards.
Year Completed |
1959 |
Dam Length |
956 |
Dam Height |
25 |
River Or Stream |
ALUM CREEK |
Primary Dam Type |
Earth |
Surface Area |
39 |
Hydraulic Height |
20 |
Nid Storage |
496 |
Structural Height |
25 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
25 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
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.
Clark No. 1