Tyann
Tyann is an earth dam located in Tulsa County, Oklahoma, built in 1950. It carries a Significant hazard potential classification and has a fair condition assessment.
About Tyann
Tyann is a dam in Tulsa, Oklahoma. The dam is owned by Tyann Development Co (private). It impounds the Tr-bird Cr near Owasso.
The dam stands 27 feet tall and stretches 450 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 114 acre-feet, and collects water from a drainage area of 330 square miles. Completed in 1950, the structure is well-established, with more than 75 years of service.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. The most recent inspection on record was 12/01/2021.
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Location
| State | Oklahoma |
| County | Tulsa |
| Nearest City | Owasso |
| River/Stream | Tr-bird Cr |
| Coordinates | 36.28846, -95.83384 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 450 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 114 acre-ft |
| Max Storage | 114 acre-ft |
| Normal Storage | 67 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 330 sq mi |
| Max Discharge | 1,780 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Other |
| Owner | TYANN DEVELOPMENT CO |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 12/01/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | OK12634 |
| Federal ID | OK12634 |
| More Info | State Dam Safety Program |