Ah Johnson Reservoir Levee is an earth dam located in Matagorda County, Texas, built in 1971. It carries a Low hazard potential classification.
Dam profile
NID height · 19 ft19 ft tall and 14,450 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Ah Johnson Reservoir Levee
The primary purpose of Ah Johnson Reservoir Levee is irrigation. The dam stores and diverts water for agricultural irrigation, supporting farming operations in the surrounding area. The dam is owned by Ah Johnson (private). It impounds the Tres Palacios Creek.
The dam stands 19 feet tall and stretches 14,450 feet across, creates a reservoir covering 74 acres, and has a maximum storage capacity of 562 acre-feet. Completed in 1971, 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. The most recent inspection on record was 12/07/1973. That was over 52 years ago.
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Location
| State | Texas |
| County | Matagorda |
| River/Stream | Tres Palacios Creek |
| Coordinates | 29.01615, -96.15150 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 14,450 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 562 acre-ft |
| Max Storage | 562 acre-ft |
| Normal Storage | 178 acre-ft |
| Surface Area | 74 acres |
| Spillway Type | None |
Ownership & Safety
| Purpose | Irrigation |
| Owner | Ah Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 12/07/1973 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX04824 |
| Federal ID | TX04824 |
| More Info | State Dam Safety Program |