Arrowhead Lake Dam is an earth dam located in Pottawattamie County, Iowa, built in 1959. It carries a Low hazard potential classification.
Dam profile
NID height · 47 ft47 ft tall and 615 ft long, taller than 91% 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 Arrowhead Lake Dam
The primary purpose of Arrowhead 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 Pottawattamie County Conservation Board (local government). It impounds the Tr-mosquito Creek near Underwood.
The dam stands 47 feet tall and stretches 615 feet across, creates a reservoir covering 15 acres, has a maximum storage capacity of 348 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1959, 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 11/06/1964. That was over 61 years ago.
At 47 feet, this dam is taller than 91% of dams nationwide.
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Location
| State | Iowa |
| County | Pottawattamie |
| Nearest City | Underwood |
| River/Stream | Tr-mosquito Creek |
| Coordinates | 41.43620, -95.59370 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 47 ft |
| Dam Height | 47 ft |
| Dam Length | 615 ft |
| Year Completed | 1959 (67 years old) |
Storage & Hydraulics
| NID Storage | 348 acre-ft |
| Max Storage | 348 acre-ft |
| Normal Storage | 139 acre-ft |
| Surface Area | 15 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Fire Protection, Stock, Or Small Fish Pond |
| Owner | Pottawattamie County Conservation Board |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 11/06/1964 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00955 |
| Federal ID | IA00955 |
| More Info | State Dam Safety Program |