Old Rock Tank Dam is an earth dam located in McMullen County, Texas, built in 1968. It carries a Low hazard potential classification.
Dam profile
NID height · 15 ft15 ft tall and 860 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 Old Rock Tank Dam
The primary purpose of Old Rock Tank 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 Dick Horton (private). It impounds the Tr-elm Creek.
The dam stands 15 feet tall and stretches 860 feet across, creates a reservoir covering 18 acres, and has a maximum storage capacity of 265 acre-feet. Completed in 1968, 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.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Texas |
| County | McMullen |
| River/Stream | Tr-elm Creek |
| Coordinates | 28.54857, -98.41943 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 15 ft |
| Dam Height | 15 ft |
| Dam Length | 860 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 265 acre-ft |
| Max Storage | 265 acre-ft |
| Normal Storage | 72 acre-ft |
| Surface Area | 18 acres |
| Spillway Type | None |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Dick Horton |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | TX03015 |
| Federal ID | TX03015 |
| More Info | State Dam Safety Program |