Collier Bertha Reservoir Report
Nearby: Collier Anderson #5
Last Updated: December 16, 2025
Collier Bertha, located in Harper, Oklahoma, is a privately owned dam designed by USDA NRCS for flood risk reduction on TR SLEEPING BEAR CR.
°F
°F
mph
Wind
%
Humidity
Summary
Constructed in 1988, this earth dam stands at 33 feet tall and spans 164 feet in length, with a capacity of 30 acre-feet for storage. The dam features a controlled spillway and a single valve outlet gate for water release, with a maximum discharge capacity of 350 cubic feet per second.
Managed by the Oklahoma Water Resources Board, Collier Bertha has a low hazard potential and is classified as having a very high risk level. Although the dam's condition is currently not rated, it undergoes inspection every 5 years to ensure its structural integrity and safety. While no emergency action plan or inundation maps are currently in place, the dam remains an essential asset for flood control in the region, providing critical protection for the surrounding area.
With its strategic location and purposeful design, Collier Bertha serves as a vital infrastructure for flood risk reduction in Harper, Oklahoma. As climate change continues to impact water resources and climate patterns, dams like Collier Bertha play a crucial role in safeguarding communities and protecting against potential flooding events. As enthusiasts of water resources and climate resilience, understanding the importance and function of structures like Collier Bertha is key to ensuring the sustainable management of our natural resources in the face of a changing climate.
Year Completed |
1988 |
Dam Length |
164 |
Dam Height |
33 |
River Or Stream |
TR SLEEPING BEAR CR |
Primary Dam Type |
Earth |
Surface Area |
1 |
Hydraulic Height |
33 |
Drainage Area |
0.1 |
Nid Storage |
30 |
Structural Height |
33 |
Outlet Gates |
Valve - 1 |
Hazard Potential |
Low |
Foundations |
Soil |
Nid Height |
33 |
Seasonal Comparison
Weather Forecast
Nearby Streamflow Levels
North Canadian River At Woodward
|
68cfs |
Cimarron River Near Buffalo
|
75cfs |
Cimarron River Near Waynoka
|
118cfs |
Cimarron R Near Buttermilk
|
44cfs |
Bluff Creek Nr Buttermilk
|
40cfs |
North Canadian River Near Seiling
|
102cfs |
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.
Collier Bertha