Jansma Dam
Jansma Dam is an earth dam located in Lyon County, Iowa, built in 1970. It carries a Low hazard potential classification.
About Jansma Dam
The primary purpose of Jansma 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 Floyd Jansma (private). It impounds the Tr-little Rock River near Doon.
The dam stands 22 feet tall and stretches 834 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 132 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1970, 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 04/09/1987. That was over 39 years ago.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Iowa |
| County | Lyon |
| Nearest City | Doon |
| River/Stream | Tr-little Rock River |
| Coordinates | 43.27030, -96.19460 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 22 ft |
| Dam Height | 22 ft |
| Dam Length | 834 ft |
| Year Completed | 1970 (56 years old) |
Storage & Hydraulics
| NID Storage | 132 acre-ft |
| Max Storage | 132 acre-ft |
| Normal Storage | 40 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Floyd Jansma |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 04/09/1987 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00605 |
| Federal ID | IA00605 |
| More Info | State Dam Safety Program |