Johnson Lake Dam
Johnson Lake Dam is an earth dam located in Grimes County, Texas, built in 1955. It carries a Low hazard potential classification.
About Johnson Lake Dam
The primary purpose of Johnson Lake 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 Flora Johnson (private). It impounds the Tr-hog Creek.
The dam stands 20 feet tall and stretches 1,126 feet across, creates a reservoir covering 21 acres, and has a maximum storage capacity of 300 acre-feet. Completed in 1955, 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.
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Location
| State | Texas |
| County | Grimes |
| River/Stream | Tr-hog Creek |
| Coordinates | 30.67306, -96.09081 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Dam Length | 1,126 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 300 acre-ft |
| Max Storage | 300 acre-ft |
| Normal Storage | 180 acre-ft |
| Surface Area | 21 acres |
| Spillway Type | None |
Ownership & Safety
| Purpose | Water Supply |
| Owner | FLORA JOHNSON |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX03074 |
| Federal ID | TX03074 |
| More Info | State Dam Safety Program |