Johnston Dam is an earth dam located in Dallas County, Iowa, built in 1971. It carries a Low hazard potential classification.
Dam profile
NID height · 43 ft43 ft tall and 245 ft long, taller than 89% 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 Johnston Dam
The primary purpose of Johnston 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 Thomas R Johnston (private). It impounds the Tr-middle Raccoon River near Redfield.
The dam stands 43 feet tall and stretches 245 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 35 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1971, 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 06/08/1978. That was over 48 years ago.
At 43 feet, this dam is taller than 89% of dams nationwide.
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Location
| State | Iowa |
| County | Dallas |
| Nearest City | Redfield |
| River/Stream | Tr-middle Raccoon River |
| Coordinates | 41.62650, -94.21590 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 43 ft |
| Dam Height | 43 ft |
| Dam Length | 245 ft |
| Year Completed | 1971 (55 years old) |
Storage & Hydraulics
| NID Storage | 35 acre-ft |
| Max Storage | 35 acre-ft |
| Normal Storage | 23 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Thomas R Johnston |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 06/08/1978 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00294 |
| Federal ID | IA00294 |
| More Info | State Dam Safety Program |