Oknoname 119001 Reservoir Report
Nearby: Willits Lake Oknoname 047001
Last Updated: December 16, 2025
Oknoname 119001 is a privately owned earth dam located in Garfield County, Oklahoma, specifically in the city of Morrison.
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Summary
Completed in 1960, this dam serves the primary purpose of flood risk reduction along the TR-LONG BRANCH CR river or stream. With a height of 35 feet and a length of 350 feet, the dam has a storage capacity of 235 acre-feet and a maximum discharge of 2645 cubic feet per second. The dam features a controlled spillway and is equipped with a single valve outlet gate.
Despite being classified as having a low hazard potential, Oknoname 119001 is identified as having a very high risk level, with a risk rating of 1. The dam's condition assessment is noted as "Not Rated", indicating a need for further evaluation. It is under the regulatory oversight of the Oklahoma Water Resources Board (OWRB), with state permitting, inspection, and enforcement in place. While the dam has not been modified in recent years, its last inspection was conducted in December 2003, with an inspection frequency of 5 years.
For water resource and climate enthusiasts, Oknoname 119001 presents an intriguing case study of a privately owned dam in Oklahoma that plays a crucial role in flood risk reduction. The dam's design and construction details, along with its storage capacity and discharge capabilities, offer valuable insights into the management of water resources in the region. With its low hazard potential but high risk level, the dam underscores the importance of regular inspections and maintenance to ensure public safety and the protection of downstream communities.
Year Completed |
1960 |
Dam Length |
350 |
Dam Height |
35 |
River Or Stream |
TR-LONG BRANCH CR |
Primary Dam Type |
Earth |
Surface Area |
8 |
Hydraulic Height |
35 |
Nid Storage |
235 |
Structural Height |
35 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
35 |
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.
Oknoname 119001