Alter Dam is an earth dam located in Howell County, Missouri, built in 1974. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall and 500 ft long, taller than 55% 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 Alter Dam
The primary purpose of Alter Dam is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Robert N Alter (private). It impounds the Tr-south Fork Spring River near Hardy Ark.
The dam stands 26 feet tall and stretches 500 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 127 acre-feet, and collects water from a drainage area of 300 square miles. Completed in 1974, 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 | Howell |
| Nearest City | Hardy Ark |
| River/Stream | Tr-south Fork Spring River |
| Coordinates | 36.55205, -91.80376 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 25 ft |
| Dam Length | 500 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 127 acre-ft |
| Max Storage | 127 acre-ft |
| Normal Storage | 78 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 300 sq mi |
| Max Discharge | 330 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Robert N Alter |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO30634 |
| Federal ID | MO30634 |
| More Info | State Dam Safety Program |