Alden Milldam is a gravity dam located in Hardin County, Iowa, built in 1932. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 375 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Alden Milldam
The primary purpose of Alden Milldam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by City of Alden (local government). It impounds the Iowa River near Alden.
The dam stands 11 feet tall and stretches 375 feet across, creates a reservoir covering 140 acres, has a maximum storage capacity of 762 acre-feet, and collects water from a drainage area of 638 square miles. Completed in 1932, the structure is well-established, with more than 75 years of service.
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 10/11/1989. That was over 37 years ago.
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Location
| State | Iowa |
| County | Hardin |
| Nearest City | Alden |
| River/Stream | Iowa River |
| Coordinates | 42.52140, -93.37660 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 375 ft |
| Year Completed | 1932 (94 years old) |
Storage & Hydraulics
| NID Storage | 762 acre-ft |
| Max Storage | 762 acre-ft |
| Normal Storage | 762 acre-ft |
| Surface Area | 140 acres |
| Drainage Area | 638 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | City of Alden |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 10/11/1989 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01268 |
| Federal ID | IA01268 |
| More Info | State Dam Safety Program |