Harcomo Lake Dam is an earth dam located in Harrison County, Missouri, built in 1978. It carries a Low hazard potential classification.
Dam profile
NID height · 20 ft20 ft tall. 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 Harcomo Lake Dam
The primary purpose of Harcomo 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 Harcomo (private). It impounds the Tr-polecat Creek near Pattonsburg.
The dam stands 20 feet tall, creates a reservoir covering 8 acres, has a maximum storage capacity of 86 acre-feet, and collects water from a drainage area of 110 square miles. Completed in 1978, the structure is 48 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 | Harrison |
| Nearest City | Pattonsburg |
| River/Stream | Tr-polecat Creek |
| Coordinates | 40.26929, -93.96367 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 20 ft |
| Dam Height | 20 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 86 acre-ft |
| Max Storage | 86 acre-ft |
| Normal Storage | 53 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 110 sq mi |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Harcomo |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO11959 |
| Federal ID | MO11959 |
| More Info | State Dam Safety Program |