Johnson Dam is an earth dam located in Davis County, Iowa, built in 1972. It carries a Low hazard potential classification.
Dam profile
NID height · 32 ft32 ft tall and 328 ft long, taller than 74% 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 Johnson Dam
The primary purpose of Johnson Dam is fire protection, stock, or small fish pond. The dam maintains a small impoundment used for fire suppression, livestock watering, or as a fish pond. The dam is owned by Richard Johnson (private). It impounds the Tr-north Fork North Fabius R near State of Missouri.
The dam stands 32 feet tall and stretches 328 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 34 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1972, 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. The most recent inspection on record was 10/04/1960. That was over 66 years ago.
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Location
| State | Iowa |
| County | Davis |
| Nearest City | State of Missouri |
| River/Stream | Tr-north Fork North Fabius R |
| Coordinates | 40.64210, -92.49520 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 328 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 34 acre-ft |
| Max Storage | 34 acre-ft |
| Normal Storage | 24 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Richard Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/04/1960 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00299 |
| Federal ID | IA00299 |
| More Info | State Dam Safety Program |