Jeffrey No. 4 Lake Dam Reservoir Report
Nearby: Day No 1 Jeffries Ma
Last Updated: January 11, 2026
Jeffrey No.
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Summary
4 Lake Dam, located in Dewey, Oklahoma, is a privately owned earth dam constructed in 1978 by the USDA NRCS. The dam stands at a height of 30 feet, with a hydraulic height of 27 feet and a length of 186 feet. It serves as a critical structure on Gypsum Creek, with a primary purpose designated as "Other" and a low hazard potential.
The dam has a normal storage capacity of 98 acre-feet and a maximum storage capacity of 160 acre-feet, covering a surface area of 6.5 acres. It features a controlled spillway type with a width of 1 foot and a maximum discharge rate of 340 cubic feet per second. The dam is equipped with a single valve outlet gate for water release. Although the condition assessment is currently not rated, the dam is subject to regular inspections every five years to ensure its structural integrity.
Despite its low hazard potential, Jeffrey No. 4 Lake Dam is considered to have a very high risk level, ranked at the highest risk score of 1. The dam is under the regulatory oversight of the Oklahoma Water Resources Board (OWRB), with state jurisdiction, permitting, inspection, and enforcement in place to ensure proper management and safety measures are implemented for this vital water resource infrastructure.
Year Completed |
1978 |
Dam Length |
186 |
Dam Height |
30 |
River Or Stream |
GYPSUM CREEK |
Primary Dam Type |
Earth |
Surface Area |
6.5 |
Hydraulic Height |
27 |
Nid Storage |
160 |
Structural Height |
30 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
30 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Canadian River Near Seiling
|
105cfs |
North Canadian River At Woodward
|
80cfs |
Washita River Near Hammon
|
13cfs |
Washita River Near Cheyenne
|
11cfs |
Washita River Near Foss
|
6cfs |
Cimarron River Near Waynoka
|
150cfs |
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.
Jeffrey No. 4 Lake Dam