Lake Hollyhill Dam
Lake Hollyhill Dam is an earth dam located in Grimes County, Texas, built in 1965. It carries a Significant hazard potential classification and has a fair condition assessment.
About Lake Hollyhill Dam
The primary purpose of Lake Hollyhill Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Hollyhill Poa (private). It impounds the Tr-mill Creek near Ventura.
The dam stands 19 feet tall and stretches 750 feet across, creates a reservoir covering 10 acres, has a maximum storage capacity of 113 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1965, 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. Its condition is rated fair — the dam has minor deficiencies that are being addressed or do not pose an immediate safety threat. An emergency action plan is in place for this dam. The most recent inspection on record was 11/08/2022.
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Location
| State | Texas |
| County | Grimes |
| Nearest City | Ventura |
| River/Stream | Tr-mill Creek |
| Coordinates | 30.25355, -95.81482 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 19 ft |
| Dam Height | 19 ft |
| Dam Length | 750 ft |
| Year Completed | 1965 (61 years old) |
Storage & Hydraulics
| NID Storage | 113 acre-ft |
| Max Storage | 113 acre-ft |
| Normal Storage | 52 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 2,540 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | LAKE HOLLYHILL POA |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Fair |
| Last Inspection | 11/08/2022 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | TX03052 |
| Federal ID | TX03052 |
| More Info | State Dam Safety Program |