Johnson Dam No 1
Key Takeaway
Johnson Dam No 1 is classified as low hazard in Texas. It was completed in 1904 and is 122 years old. Its primary use is irrigation.
Physical Details
| Dam Height | 9 ft (taller than 2.7% in TX) |
| Dam Length | 200 ft |
| Dam Type | Gravity |
| Max Storage | 106 acre-ft |
| Normal Storage | 241 acre-ft |
| Surface Area | 34 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 1 cfs |
| Year Completed | 1904 (122 years old) |
| NID ID | TX03132 |
Safety Information
No probable loss of human life and low economic/environmental losses expected.
Hazard potential describes downstream consequences of failure, not the dam's current condition. What does this mean?
Ownership
J MCGILL
Private
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High Hazard 24 ftFrequently Asked Questions
What is the hazard classification of Johnson Dam No 1?
Johnson Dam No 1 is classified as Low Hazard. No probable loss of human life and low economic/environmental losses expected. This classification refers to the potential downstream consequences of a failure, not the dam's current structural condition.
Who owns and operates Johnson Dam No 1?
Johnson Dam No 1 is owned by J MCGILL (Private). The owner is responsible for maintenance, inspections, and compliance with dam safety regulations.
When was Johnson Dam No 1 built?
Johnson Dam No 1 was completed in 1904, making it 122 years old. Many U.S. dams were built between the 1930s and 1970s during a period of major infrastructure investment.
What is the primary purpose of Johnson Dam No 1?
Johnson Dam No 1 serves the following purposes: Irrigation, Fire Protection, Stock, Or Small Fish Pond. Many dams in the U.S. are multi-purpose, supporting flood control, water supply, recreation, and other uses.
How tall is Johnson Dam No 1?
Johnson Dam No 1 has a dam height of 9 ft. Dam height is measured from the natural streambed at the downstream toe to the top of the dam, and may differ from the visible height.
When was Johnson Dam No 1 last inspected?
Johnson Dam No 1 was last inspected on April 24, 2014. Inspection dates indicate when a formal review occurred, not the results of that inspection.