Koa Lake Dam is an earth dam located in La Salle County, Texas, built in 1971. It carries a Significant hazard potential classification.
Dam profile
NID height · 10 ft10 ft tall and 882 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 Koa Lake Dam
The primary purpose of Koa 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 Jose Villarreal (private). It impounds the Tr-nueces River.
The dam stands 10 feet tall and stretches 882 feet across, creates a reservoir covering 14 acres, has a maximum storage capacity of 122 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1971, the structure is well into its service life at over 50 years 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 02/10/2016. That was over 10 years ago.
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Location
| State | Texas |
| County | La Salle |
| River/Stream | Tr-nueces River |
| Coordinates | 28.43193, -99.25194 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 10 ft |
| Dam Height | 10 ft |
| Dam Length | 882 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 122 acre-ft |
| Max Storage | 122 acre-ft |
| Normal Storage | 108 acre-ft |
| Surface Area | 14 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Jose Villarreal |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 02/10/2016 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX04604 |
| Federal ID | TX04604 |
| More Info | State Dam Safety Program |