Horse Lake Dam is an earth dam located in Plymouth County, Iowa, built in 1963. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 67 ft67 ft tall and 730 ft long, taller than 96% of U.S. dams with a recorded height. Height is drawn to scale against a ten-story building, about 100 ft; the profile is a generic embankment section and the water level is illustrative.
About Horse Lake Dam
The primary purpose of Horse Lake 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 Plymouth County Board of Supervisors (local government). It impounds the Tr-perry Creek near Sioux City.
The dam stands 67 feet tall and stretches 730 feet across, creates a reservoir covering 18 acres, has a maximum storage capacity of 391 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1963, 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 10/12/2021.
At 67 feet, this dam is taller than 96% of all dams in the United States.
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Location
| State | Iowa |
| County | Plymouth |
| Nearest City | Sioux City |
| River/Stream | Tr-perry Creek |
| Coordinates | 42.59370, -96.43270 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 67 ft |
| Dam Height | 67 ft |
| Dam Length | 730 ft |
| Year Completed | 1963 (63 years old) |
Storage & Hydraulics
| NID Storage | 391 acre-ft |
| Max Storage | 391 acre-ft |
| Normal Storage | 216 acre-ft |
| Surface Area | 18 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Plymouth County Board of Supervisors |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 10/12/2021 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00893 |
| Federal ID | IA00893 |
| More Info | State Dam Safety Program |