Collier Bertha is an earth dam located in Harper County, Oklahoma, built in 1988. It carries a Low hazard potential classification.
Dam profile
NID height · 33 ft33 ft tall and 164 ft long, taller than 76% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Collier Bertha
The primary purpose of Collier Bertha is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Twila Mae Eddins-worthy (private). It impounds the Tr Sleeping Bear Cr.
The dam stands 33 feet tall and stretches 164 feet across, creates a reservoir covering 1 acres, has a maximum storage capacity of 30 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1988, the structure is 38 years old.
This dam has a low hazard potential classification, meaning that failure would cause minimal damage, limited primarily to the dam owner's property, with no expected loss of life. The most recent inspection on record was 08/17/2011. That was over 15 years ago.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Oklahoma |
| County | Harper |
| River/Stream | Tr Sleeping Bear Cr |
| Coordinates | 36.61680, -99.33804 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 164 ft |
| Year Completed | 1988 (38 years old) |
Storage & Hydraulics
| NID Storage | 30 acre-ft |
| Max Storage | 30 acre-ft |
| Normal Storage | 8 acre-ft |
| Surface Area | 1 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 350 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Twila Mae Eddins-worthy |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/17/2011 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OK21914 |
| Federal ID | OK21914 |
| More Info | State Dam Safety Program |