Tannahill Winnie G.
Tannahill Winnie G. is an earth dam located in Harper County, Oklahoma, built in 1960. It carries a Low hazard potential classification.
About Tannahill Winnie G.
Tannahill Winnie G. is a dam in Harper, Oklahoma. The dam is owned by Mcallister Ranch Llc (private). It impounds the Tr-traders Cr near Freedom.
The dam stands 28 feet tall and stretches 500 feet across, creates a reservoir covering 3 acres, and has a maximum storage capacity of 110 acre-feet. Completed in 1960, the structure is well into its service life at over 50 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 08/12/2011. That was over 14 years ago.
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Location
| State | Oklahoma |
| County | Harper |
| Nearest City | Freedom |
| River/Stream | Tr-traders Cr |
| Coordinates | 36.68983, -99.29654 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 500 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 110 acre-ft |
| Max Storage | 110 acre-ft |
| Normal Storage | 50 acre-ft |
| Surface Area | 3 acres |
| Max Discharge | 790 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Other |
| Owner | MCALLISTER RANCH LLC |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 08/12/2011 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OK12260 |
| Federal ID | OK12260 |
| More Info | State Dam Safety Program |