Arnot Lake Dam is an earth dam located in St. Charles County, Missouri, built in 1960. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall, taller than 50% 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 Arnot Lake Dam
The primary purpose of Arnot Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Dr John Arnot (private). It impounds the Tr Cunningham Branch near St Peters.
The dam stands 25 feet tall, creates a reservoir covering 6 acres, has a maximum storage capacity of 80 acre-feet, and collects water from a drainage area of 110 square miles. Completed in 1960, 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 | St. Charles |
| Nearest City | St Peters |
| River/Stream | Tr Cunningham Branch |
| Coordinates | 38.71456, -90.86235 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 80 acre-ft |
| Max Storage | 80 acre-ft |
| Normal Storage | 45 acre-ft |
| Surface Area | 6 acres |
| Drainage Area | 110 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Dr John Arnot |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO30637 |
| Federal ID | MO30637 |
| More Info | State Dam Safety Program |