Hobart Reservoir Report
Nearby: Ridling Oknoname 149029
Last Updated: December 19, 2025
Hobart, also known as Rocky Lake, is a water supply dam located in Washita County, Oklahoma.
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Summary
Constructed in 1933 by W.R. HOLWAY, this earth dam stands at a height of 29 feet and has a storage capacity of 6,340 acre-feet, serving as a vital source of water for the surrounding community. The dam is situated on Little Elk Creek and covers a surface area of 347 acres, with a drainage area of 55.94 square miles.
Despite its importance for water supply, Hobart has been flagged as having a high hazard potential and poor condition assessment, indicating a need for maintenance and potential safety improvements. The dam features a controlled spillway type with a width of 4 feet and outlet gates composed of two valves. The risk assessment for Hobart ranks at a very high level (1), highlighting the critical need for effective risk management measures to ensure the safety and stability of the structure.
Oklahoma Water Resources Board (OWRB) oversees the regulation, permitting, inspection, and enforcement of Hobart, working to ensure compliance with state jurisdiction requirements. With its strategic location and historical significance, Hobart serves as a key infrastructure asset in the region, emphasizing the importance of proactive maintenance and risk management to safeguard its functionality and the community it serves.
Year Completed |
1933 |
Dam Length |
1950 |
Dam Height |
29 |
River Or Stream |
LITTLE ELK CREEK |
Primary Dam Type |
Earth |
Surface Area |
347 |
Hydraulic Height |
29 |
Drainage Area |
55.94 |
Nid Storage |
6340 |
Structural Height |
29 |
Outlet Gates |
Valve - 2 |
Hazard Potential |
High |
Foundations |
Soil |
Nid Height |
29 |
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.
Hobart