H.k. Thatcher Lock And Dam
Significant HazardNot Available ConditionEmergency Action Plan: Yes
Location
| State | Arkansas |
| County | Union |
| Nearest City | MORO BAY |
| River/Stream | OUACHITA |
| Coordinates | 33.30665, -92.48316 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 80 ft |
| Dam Length | 698 ft |
| Year Completed | 1983 (43 years old) |
Storage & Hydraulics
| NID Storage | 108,000 acre-ft |
| Max Storage | 108,000 acre-ft |
| Normal Storage | 79,900 acre-ft |
| Surface Area | 12,200 acres |
| Drainage Area | 6,569 sq mi |
| Max Discharge | 250,000 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Navigation |
| Owner | USACE - Vicksburg District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not Available |
| Last Inspection | 09/04/2025 |
| Emergency Action Plan | Yes |