Hein Lake Dam is an earth dam located in Grundy County, Missouri, built in 1975. It carries a Low hazard potential classification.
Dam profile
NID height · 29 ft29 ft tall, taller than 65% 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 Hein Lake Dam
The primary purpose of Hein 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 William Hein (private). It impounds the Tr-middle Creek near Trenton.
The dam stands 29 feet tall, creates a reservoir covering 28 acres, has a maximum storage capacity of 434 acre-feet, and collects water from a drainage area of 140 square miles. Completed in 1975, 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 | Grundy |
| Nearest City | Trenton |
| River/Stream | Tr-middle Creek |
| Coordinates | 40.19251, -93.66744 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Year Completed | 1975 (51 years old) |
Storage & Hydraulics
| NID Storage | 434 acre-ft |
| Max Storage | 434 acre-ft |
| Normal Storage | 123 acre-ft |
| Surface Area | 28 acres |
| Drainage Area | 140 sq mi |
Ownership & Safety
| Purpose | Debris Control |
| Owner | William Hein |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO10615 |
| Federal ID | MO10615 |
| More Info | State Dam Safety Program |