L Sullivan Reservoir Report
Nearby: Oknoname 013007 Elmer Williams
Last Updated: December 5, 2025
L Sullivan is a private earth dam located in Bryan, Oklahoma, with a primary purpose of irrigation.
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Summary
Built in 1976 by the USDA NRCS, this structure stands at a height of 29 feet and has a length of 399 feet. The dam has a storage capacity of 80 acre-feet, with a normal storage level of 60 acre-feet and a surface area of 12 acres.
Despite being categorized as having a low hazard potential, L Sullivan is considered to have a moderate risk level. The spillway type is uncontrolled, with a width of 45 feet, and the maximum discharge capacity is 252 cubic feet per second. Although the condition assessment is currently rated as "Not Rated", the risk management measures and emergency action plans for the dam are not documented.
Located in the Fort Worth District and overseen by the Natural Resources Conservation Service, L Sullivan is a key component for irrigation in the area. With a rich history dating back to the 1970s, this earth dam continues to play a vital role in water resource management for the surrounding community in Oklahoma.
Year Completed |
1976 |
Dam Length |
399 |
Dam Height |
29 |
Primary Dam Type |
Earth |
Surface Area |
12 |
Hydraulic Height |
29 |
Drainage Area |
0.23 |
Nid Storage |
80 |
Hazard Potential |
Low |
Nid Height |
29 |
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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.
L Sullivan