Johnston Dam
Johnston Dam is an earth dam located in Van Buren County, Iowa, built in 2005. It carries a Low hazard potential classification.
About Johnston Dam
The primary purpose of Johnston Dam is grade stabilization. Grade stabilization dams prevent erosion by reducing the slope and velocity of water flowing through a channel. They're commonly used to stop gullies from deepening and to protect downstream land and infrastructure. The dam is owned by Mike Johnston (private). It impounds the Trib To Des Moines River near Keosauqua.
The dam stands 29 feet tall and stretches 220 feet across, creates a reservoir covering 2 acres, has a maximum storage capacity of 29 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2005, the structure is relatively new.
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 | Iowa |
| County | Van Buren |
| Nearest City | Keosauqua |
| River/Stream | Trib To Des Moines River |
| Coordinates | 40.72360, -92.01170 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 29 ft |
| Dam Height | 29 ft |
| Dam Length | 220 ft |
| Year Completed | 2005 (21 years old) |
Storage & Hydraulics
| NID Storage | 29 acre-ft |
| Max Storage | 29 acre-ft |
| Normal Storage | 18 acre-ft |
| Surface Area | 2 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 137 cfs |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Mike Johnston |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04059 |
| Federal ID | IA04059 |
| More Info | State Dam Safety Program |