Longhorn Lake Dam is an earth dam located in Gillespie County, Texas, built in 1967. It carries a Significant hazard potential classification.
Dam profile
NID height · 37 ft37 ft tall and 445 ft long, taller than 83% 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 Longhorn Lake Dam
The primary purpose of Longhorn Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Tx 77 Boot Ranch Circle LLC (private). It impounds the Palo Alto Creek.
The dam stands 37 feet tall and stretches 445 feet across, creates a reservoir covering 13 acres, has a maximum storage capacity of 260 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1967, 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. The most recent inspection on record was 11/04/2010. That was over 15 years ago.
At 37 feet, this dam is taller than 83% of dams nationwide.
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Location
| State | Texas |
| County | Gillespie |
| River/Stream | Palo Alto Creek |
| Coordinates | 30.35480, -98.88766 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 37 ft |
| Dam Height | 37 ft |
| Dam Length | 445 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 260 acre-ft |
| Max Storage | 260 acre-ft |
| Normal Storage | 158 acre-ft |
| Surface Area | 13 acres |
| Drainage Area | 1 sq mi |
| Max Discharge | 5,400 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Tx 77 Boot Ranch Circle LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 11/04/2010 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX02549 |
| Federal ID | TX02549 |
| More Info | State Dam Safety Program |