Koski Dam
Koski Dam is an earth dam located in Harrison County, Iowa, built in 2011. It carries a Low hazard potential classification.
About Koski Dam
The primary purpose of Koski Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by George Koski (private). It impounds the Trib To Willow Creek near Missouri Valley.
The dam stands 41 feet tall and stretches 500 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 48 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2011, the structure is relatively new.
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.
At 41 feet, this dam is taller than 88% of dams nationwide.
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Location
| State | Iowa |
| County | Harrison |
| Nearest City | Missouri Valley |
| River/Stream | Trib To Willow Creek |
| Coordinates | 41.85500, -95.71360 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 41 ft |
| Dam Height | 41 ft |
| Dam Length | 500 ft |
| Year Completed | 2011 (15 years old) |
Storage & Hydraulics
| NID Storage | 48 acre-ft |
| Max Storage | 48 acre-ft |
| Normal Storage | 15 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 13 cfs |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | George Koski |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04179 |
| Federal ID | IA04179 |
| More Info | State Dam Safety Program |