Olsen Dam is an earth dam located in Harrison County, Iowa, built in 1961. It carries a Low hazard potential classification.
Dam profile
NID height · 52 ft52 ft tall and 671 ft long, taller than 93% 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 Olsen Dam
The primary purpose of Olsen 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 Ec Olsen (private). It impounds the Tr-willow Creek near Missouri Valley.
The dam stands 52 feet tall and stretches 671 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 165 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1961, 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 52 feet, this dam is taller than 93% of dams nationwide.
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Location
| State | Iowa |
| County | Harrison |
| Nearest City | Missouri Valley |
| River/Stream | Tr-willow Creek |
| Coordinates | 41.64250, -95.87980 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 52 ft |
| Dam Height | 52 ft |
| Dam Length | 671 ft |
| Year Completed | 1961 (65 years old) |
Storage & Hydraulics
| NID Storage | 165 acre-ft |
| Max Storage | 165 acre-ft |
| Normal Storage | 75 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Ec Olsen |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00470 |
| Federal ID | IA00470 |
| More Info | State Dam Safety Program |