Koban Lake Dam is an earth dam located in Pulaski County, Arkansas, built in 1961. It carries a Significant hazard potential classification and has a poor condition assessment.
Dam profile
NID height · 31 ft31 ft tall and 360 ft long, taller than 72% of U.S. dams with a recorded height. 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 Koban Lake Dam
The primary purpose of Koban 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 Koban Family, LLC (private). It impounds the Mc Henry Creek-os near Little Rock.
The dam stands 31 feet tall and stretches 360 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 223 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1961, 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 poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 08/16/2025.
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Location
| State | Arkansas |
| County | Pulaski |
| Nearest City | Little Rock |
| River/Stream | Mc Henry Creek-os |
| Coordinates | 34.70333, -92.43333 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 31 ft |
| Dam Height | 29 ft |
| Dam Length | 360 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 223 acre-ft |
| Max Storage | 223 acre-ft |
| Normal Storage | 156 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 587 cfs |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Koban Family, LLC |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 08/16/2025 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | AR00126 |
| Federal ID | AR00126 |
| More Info | State Dam Safety Program |