Johnson Dam
Johnson Dam is an earth dam located in Decatur County, Iowa, built in 1974. It carries a Low hazard potential classification.
About Johnson Dam
The primary purpose of Johnson Dam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by Da Johnson (private). It impounds the Tr-weldon River near Princeton, Mo.
The dam stands 32 feet tall and stretches 370 feet across, creates a reservoir covering 4 acres, has a maximum storage capacity of 59 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1974, 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.
At 32 feet, this dam is taller than 76% of dams nationwide.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Iowa |
| County | Decatur |
| Nearest City | Princeton, Mo |
| River/Stream | Tr-weldon River |
| Coordinates | 40.81550, -93.62900 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 32 ft |
| Dam Height | 32 ft |
| Dam Length | 370 ft |
| Year Completed | 1974 (52 years old) |
Storage & Hydraulics
| NID Storage | 59 acre-ft |
| Max Storage | 59 acre-ft |
| Normal Storage | 41 acre-ft |
| Surface Area | 4 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | DA Johnson |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01892 |
| Federal ID | IA01892 |
| More Info | State Dam Safety Program |