Duncan Lake Dam is an earth dam located in Franklin County, Missouri, built in 1956. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall, taller than 68% 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 Duncan Lake Dam
The primary purpose of Duncan Lake Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Leon L Duncan (private). It impounds the Tr to Spring Creek near Union.
The dam stands 30 feet tall, creates a reservoir covering 10 acres, has a maximum storage capacity of 160 acre-feet, and collects water from a drainage area of 220 square miles. Completed in 1956, 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 | Franklin |
| Nearest City | Union |
| River/Stream | Tr to Spring Creek |
| Coordinates | 38.29938, -91.18760 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Year Completed | 1956 (70 years old) |
Storage & Hydraulics
| NID Storage | 160 acre-ft |
| Max Storage | 160 acre-ft |
| Normal Storage | 85 acre-ft |
| Surface Area | 10 acres |
| Drainage Area | 220 sq mi |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Leon L Duncan |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO30582 |
| Federal ID | MO30582 |
| More Info | State Dam Safety Program |