Lake Lashane Dam
Lake Lashane Dam is an earth dam located in Decatur County, Iowa, built in 1954. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Lake Lashane Dam
The primary purpose of Lake Lashane 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 Lamoni Municipal Utilities (local government). It impounds the Tr- Shane Creek near Lamoni.
The dam stands 30 feet tall and stretches 1,000 feet across, creates a reservoir covering 100 acres, has a maximum storage capacity of 1,830 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1954, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 07/02/2020.
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Location
| State | Iowa |
| County | Decatur |
| Nearest City | Lamoni |
| River/Stream | Tr- Shane Creek |
| Coordinates | 40.62790, -93.97560 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 1,000 ft |
| Year Completed | 1954 (72 years old) |
Storage & Hydraulics
| NID Storage | 1,830 acre-ft |
| Max Storage | 1,830 acre-ft |
| Normal Storage | 559 acre-ft |
| Surface Area | 100 acres |
| Drainage Area | 4 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | Lamoni Municipal Utilities |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/02/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01341 |
| Federal ID | IA01341 |
| More Info | State Dam Safety Program |