Mononame 558 is an earth dam located in Washington County, Missouri, built in 1961. It carries a Low hazard potential classification.
Dam profile
NID height · 26 ft26 ft tall, 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 Mononame 558
The primary purpose of Mononame 558 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Unknown (private). It impounds the Tr Little Indian Creek near Richwoods.
The dam stands 26 feet tall, creates a reservoir covering 3 acres, has a maximum storage capacity of 42 acre-feet, and collects water from a drainage area of 44 square miles. Completed in 1961, 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 | Washington |
| Nearest City | Richwoods |
| River/Stream | Tr Little Indian Creek |
| Coordinates | 38.12991, -90.81960 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 26 ft |
| Dam Height | 26 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 42 acre-ft |
| Max Storage | 42 acre-ft |
| Normal Storage | 21 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 44 sq mi |
Ownership & Safety
| Purpose | Recreation |
| Owner | Unknown |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MO30724 |
| Federal ID | MO30724 |
| More Info | State Dam Safety Program |