Johnston Dam No 1
Johnston Dam No 1 is an earth dam located in Harrison County, Texas, built in 1950. It carries a Low hazard potential classification.
About Johnston Dam No 1
The primary purpose of Johnston Dam No 1 is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by R Byron Roach Et Ux (private). It impounds the Tr-big Mason Creek.
The dam stands 20 feet tall and stretches 700 feet across, and has a maximum storage capacity of 260 acre-feet. Completed in 1950, the structure is well-established, with more than 75 years of service.
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.
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Location
| State | Texas |
| County | Harrison |
| River/Stream | Tr-big Mason Creek |
| Coordinates | 32.48280, -94.67460 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 700 ft |
| Year Completed | 1950 (76 years old) |
Storage & Hydraulics
| NID Storage | 260 acre-ft |
| Max Storage | 260 acre-ft |
| Normal Storage | 160 acre-ft |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | R BYRON ROACH ET UX |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX03558 |
| Federal ID | TX03558 |
| More Info | State Dam Safety Program |