Thorney Hill Dam
Thorney Hill Dam is an earth dam located in Montgomery County, Missouri, built in 1970. It carries a Low hazard potential classification.
About Thorney Hill Dam
The primary purpose of Thorney Hill 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 Margaret Daller (private). It impounds the Tr-loutre River near New Haven.
The dam stands 30 feet tall, creates a reservoir covering 8 acres, has a maximum storage capacity of 128 acre-feet, and collects water from a drainage area of 135 square miles. Completed in 1970, the structure is well into its service life at over 50 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 | Montgomery |
| Nearest City | New Haven |
| River/Stream | Tr-loutre River |
| Coordinates | 38.76338, -91.49880 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 128 acre-ft |
| Max Storage | 128 acre-ft |
| Normal Storage | 80 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 135 sq mi |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | MARGARET DALLER |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO30931 |
| Federal ID | MO30931 |
| More Info | State Dam Safety Program |