South Magnolia Watershed Site 1 is an earth dam located in Harrison County, Iowa, built in 1958. It carries a Low hazard potential classification.
Dam profile
NID height · 57 ft57 ft tall and 390 ft long, taller than 94% 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 South Magnolia Watershed Site 1
The primary purpose of South Magnolia Watershed Site 1 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 Harrison County Swcd (local government). It impounds the Tr-willow Creek near Missouri Valley.
The dam stands 57 feet tall and stretches 390 feet across, creates a reservoir covering 7 acres, has a maximum storage capacity of 209 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1958, 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 11/18/1965. That was over 60 years ago.
At 57 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Iowa |
| County | Harrison |
| Nearest City | Missouri Valley |
| River/Stream | Tr-willow Creek |
| Coordinates | 41.66190, -95.86680 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 57 ft |
| Dam Height | 57 ft |
| Dam Length | 390 ft |
| Year Completed | 1958 (68 years old) |
Storage & Hydraulics
| NID Storage | 209 acre-ft |
| Max Storage | 209 acre-ft |
| Normal Storage | 128 acre-ft |
| Surface Area | 7 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Harrison County Swcd |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/18/1965 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00480 |
| Federal ID | IA00480 |
| More Info | State Dam Safety Program |