Twin Lakes Dam is an earth dam located in Tyler County, Texas, built in 1915. It carries a Significant hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 900 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 Twin Lakes Dam
The primary purpose of Twin Lakes 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 Bailey Four Canyon Ranch (private). It impounds the Mangus Branch near Hillister.
The dam stands 10 feet tall and stretches 900 feet across, creates a reservoir covering 25 acres, and has a maximum storage capacity of 125 acre-feet. Completed in 1915, the structure is over a century old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. The most recent inspection on record was 09/29/2009. That was over 17 years ago.
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Location
| State | Texas |
| County | Tyler |
| Nearest City | Hillister |
| River/Stream | Mangus Branch |
| Coordinates | 30.71469, -94.45137 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 900 ft |
| Year Completed | 1915 (111 years old) |
Storage & Hydraulics
| NID Storage | 125 acre-ft |
| Max Storage | 125 acre-ft |
| Normal Storage | 75 acre-ft |
| Surface Area | 25 acres |
| Spillway Type | None |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Bailey Four Canyon Ranch |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 09/29/2009 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX03766 |
| Federal ID | TX03766 |
| More Info | State Dam Safety Program |