Clarence Cannon Re-regulation Dam is a concrete dam located in Ralls County, Missouri, built in 1979. It carries a Significant hazard potential classification.
Dam profile
NID height · 38 ft38 ft tall and 1,550 ft long, taller than 84% 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 concrete gravity section and the water level is illustrative.
About Clarence Cannon Re-regulation Dam
The primary purpose of Clarence Cannon Re-regulation 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 USACE - St. Louis District (federal). It impounds the Salt River near New London.
The dam stands 38 feet tall and stretches 1,550 feet across, creates a reservoir covering 110 acres, has a maximum storage capacity of 8,400 acre-feet, and collects water from a drainage area of 29 square miles. Completed in 1979, the structure is 47 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. An emergency action plan is in place for this dam. The most recent inspection on record was 06/23/2025.
At 38 feet, this dam is taller than 84% of dams nationwide.
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Location
| State | Missouri |
| County | Ralls |
| Nearest City | New London |
| River/Stream | Salt River |
| Coordinates | 39.56511, -91.57029 |
Physical Characteristics
| Dam Type | Concrete |
| NID Height | 38 ft |
| Dam Height | 38 ft |
| Dam Length | 1,550 ft |
| Year Completed | 1979 (47 years old) |
Storage & Hydraulics
| NID Storage | 8,400 acre-ft |
| Max Storage | 8,400 acre-ft |
| Normal Storage | 3,200 acre-ft |
| Surface Area | 110 acres |
| Drainage Area | 29 sq mi |
| Max Discharge | 12,200 cfs |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | USACE - St. Louis District |
| Owner Type | Federal |
| Hazard Classification | Significant |
| Condition Assessment | Not assessed |
| Last Inspection | 06/23/2025 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | MO12086 |
| Federal ID | MO12086 |
| More Info | State Dam Safety Program |