Tank Johnson Dam is an earth dam located in Nacogdoches County, Texas, built in 1925. It carries a Low hazard potential classification.
Dam profile
NID height · 16 ft16 ft tall and 345 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 Tank Johnson Dam
The primary purpose of Tank Johnson Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by John Mast (private). It impounds the Alazan Bayou.
The dam stands 16 feet tall and stretches 345 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 87 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1925, 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.
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Location
| State | Texas |
| County | Nacogdoches |
| River/Stream | Alazan Bayou |
| Coordinates | 31.59454, -94.75933 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 16 ft |
| Dam Height | 16 ft |
| Dam Length | 345 ft |
| Year Completed | 1925 (101 years old) |
Storage & Hydraulics
| NID Storage | 87 acre-ft |
| Max Storage | 87 acre-ft |
| Normal Storage | 8 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | None |
Ownership & Safety
| Purpose | Recreation |
| Owner | John Mast |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX03871 |
| Federal ID | TX03871 |
| More Info | State Dam Safety Program |