Thompson Mg is an earth dam located in Okmulgee County, Oklahoma, built in 1940. It carries a Low hazard potential classification.
Dam profile
NID height · 21 ft21 ft tall and 470 ft long. 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 Thompson Mg
The primary purpose of Thompson Mg 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 Jack Or Mary Jamison (private). It impounds the Tr-browns Creek near Edna.
The dam stands 21 feet tall and stretches 470 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 50 acre-feet. Completed in 1940, the structure is well-established, with more than 75 years of service.
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 08/25/2011. That was over 15 years ago.
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Location
| State | Oklahoma |
| County | Okmulgee |
| Nearest City | Edna |
| River/Stream | Tr-browns Creek |
| Coordinates | 35.77842, -96.18368 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 21 ft |
| Dam Height | 21 ft |
| Dam Length | 470 ft |
| Year Completed | 1940 (86 years old) |
Storage & Hydraulics
| NID Storage | 50 acre-ft |
| Max Storage | 50 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 3 acres |
| Max Discharge | 90 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Jack Or Mary Jamison |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/25/2011 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OK12804 |
| Federal ID | OK12804 |
| More Info | State Dam Safety Program |