Lake Margery Dam is an earth dam located in San Saba County, Texas, built in 1975. It carries a Significant hazard potential classification and has a fair condition assessment.
Dam profile
NID height · 33 ft33 ft tall and 1,440 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 Lake Margery Dam
The primary purpose of Lake Margery Dam is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Leonard Farms (private). It impounds the Tr-bonnett Creek.
The dam stands 33 feet tall and stretches 1,440 feet across, creates a reservoir covering 54 acres, has a maximum storage capacity of 1,215 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1975, the structure is well into its service life at over 50 years old.
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. An emergency action plan is in place for this dam. The most recent inspection on record was 10/20/2020.
At 33 feet, this dam is taller than 76% of dams nationwide.
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Location
| State | Texas |
| County | San Saba |
| River/Stream | Tr-bonnett Creek |
| Coordinates | 31.19690, -98.91052 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 33 ft |
| Dam Height | 33 ft |
| Dam Length | 1,440 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 1,215 acre-ft |
| Max Storage | 1,215 acre-ft |
| Normal Storage | 485 acre-ft |
| Surface Area | 54 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 5,002 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Leonard Farms |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 10/20/2020 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX04811 |
| Federal ID | TX04811 |
| More Info | State Dam Safety Program |