John Cowan Dam
John Cowan Dam is an earth dam located in Stoddard County, Missouri, built in 1980. It carries a Low hazard potential classification.
About John Cowan Dam
The primary purpose of John Cowan 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 John A Cowan (private). It impounds the Tr-poplar Branch near Avert.
The dam stands 27 feet tall and stretches 400 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 36 acre-feet, and collects water from a drainage area of 96 square miles. Completed in 1980, the structure is 46 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.
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Location
| State | Missouri |
| County | Stoddard |
| Nearest City | Avert |
| River/Stream | Tr-poplar Branch |
| Coordinates | 36.92724, -89.87541 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 27 ft |
| Dam Height | 27 ft |
| Dam Length | 400 ft |
| Year Completed | 1980 (46 years old) |
Storage & Hydraulics
| NID Storage | 36 acre-ft |
| Max Storage | 36 acre-ft |
| Normal Storage | 36 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 96 sq mi |
| Max Discharge | 380 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | JOHN A COWAN |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO40108 |
| Federal ID | MO40108 |
| More Info | State Dam Safety Program |