Lake Johnson City Dam
Lake Johnson City Dam is a buttress dam located in Blanco County, Texas, built in 1967. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Lake Johnson City Dam
The primary purpose of Lake Johnson City Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City Of Johnson City (local government). It impounds the Pedernales River.
The dam stands 15 feet tall and stretches 590 feet across, creates a reservoir covering 42 acres, and has a maximum storage capacity of 345 acre-feet. Completed in 1967, 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 03/25/2021.
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Location
| State | Texas |
| County | Blanco |
| River/Stream | Pedernales River |
| Coordinates | 30.28752, -98.39614 |
Physical Characteristics
| Dam Type | Buttress |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 590 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 345 acre-ft |
| Max Storage | 345 acre-ft |
| Normal Storage | 345 acre-ft |
| Surface Area | 42 acres |
| Max Discharge | 4,280 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | CITY OF JOHNSON CITY |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 03/25/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX01569 |
| Federal ID | TX01569 |
| More Info | State Dam Safety Program |