Johnson Dam (washington Co)
Johnson Dam (washington Co) is an earth dam located in Louisa County, Iowa, built in 2005. It carries a Low hazard potential classification.
About Johnson Dam (washington Co)
The primary purpose of Johnson Dam (washington Co) 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 Jackie Johnson (private). It impounds the Tr- Long Creek near Wapello.
The dam stands 25 feet tall and stretches 500 feet across, creates a reservoir covering 12 acres, has a maximum storage capacity of 159 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 | Louisa |
| Nearest City | Wapello |
| River/Stream | Tr- Long Creek |
| Coordinates | 41.27000, -91.48000 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 500 ft |
| Year Completed | 2005 (21 years old) |
Storage & Hydraulics
| NID Storage | 159 acre-ft |
| Max Storage | 159 acre-ft |
| Surface Area | 12 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 34 cfs |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Jackie Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04058 |
| Federal ID | IA04058 |
| More Info | State Dam Safety Program |