Johnson Dam No 1
Johnson Dam No 1 is a gravity dam located in Tom Green County, Texas, built in 1904. It carries a Low hazard potential classification.
About Johnson Dam No 1
The primary purpose of Johnson 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 J Mcgill (private). It impounds the Concho River.
The dam stands 9 feet tall and stretches 200 feet across, creates a reservoir covering 33 acres, and has a maximum storage capacity of 106 acre-feet. Completed in 1904, the structure is over a century 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. The most recent inspection on record was 04/24/2014. That was over 11 years ago.
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Location
| State | Texas |
| County | Tom Green |
| River/Stream | Concho River |
| Coordinates | 31.46442, -100.36642 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 9 ft |
| Dam Height | 9 ft |
| Dam Length | 200 ft |
| Year Completed | 1904 (122 years old) |
Storage & Hydraulics
| NID Storage | 241 acre-ft |
| Max Storage | 106 acre-ft |
| Normal Storage | 241 acre-ft |
| Surface Area | 33 acres |
| Max Discharge | 1 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Irrigation |
| Owner | J MCGILL |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 04/24/2014 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX03132 |
| Federal ID | TX03132 |
| More Info | State Dam Safety Program |