Happy Hollow Lake Dam is an earth dam located in Platte County, Missouri, built in 1963. It carries a Low hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall, taller than 62% 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 Happy Hollow Lake Dam
The primary purpose of Happy Hollow 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 James F Porter (private). It impounds the Tr-platte River near Farley.
The dam stands 28 feet tall, creates a reservoir covering 3 acres, has a maximum storage capacity of 45 acre-feet, and collects water from a drainage area of 140 square miles. Completed in 1963, 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 | Platte |
| Nearest City | Farley |
| River/Stream | Tr-platte River |
| Coordinates | 39.28870, -94.82881 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 45 acre-ft |
| Max Storage | 45 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 140 sq mi |
Ownership & Safety
| Purpose | Debris Control |
| Owner | James F Porter |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO10647 |
| Federal ID | MO10647 |
| More Info | State Dam Safety Program |