Humboldt Milldam is a gravity dam located in Humboldt County, Iowa, built in 1912. It carries a Low hazard potential classification.
Dam profile
NID height · 13 ft13 ft tall and 460 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 Humboldt Milldam
The primary purpose of Humboldt Milldam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Humboldt County Conservation Board (local government). It impounds the West Fork Des Moines River near Humboldt.
The dam stands 13 feet tall and stretches 460 feet across, creates a reservoir covering 470 acres, has a maximum storage capacity of 3,071 acre-feet, and collects water from a drainage area of 2,256 square miles. Completed in 1912, the structure is over a century 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 01/20/2004. That was over 22 years ago.
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Location
| State | Iowa |
| County | Humboldt |
| Nearest City | Humboldt |
| River/Stream | West Fork Des Moines River |
| Coordinates | 42.72670, -94.22930 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 13 ft |
| Dam Height | 13 ft |
| Dam Length | 460 ft |
| Year Completed | 1912 (114 years old) |
Storage & Hydraulics
| NID Storage | 3,071 acre-ft |
| Max Storage | 3,071 acre-ft |
| Normal Storage | 3,071 acre-ft |
| Surface Area | 470 acres |
| Drainage Area | 2,256 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Humboldt County Conservation Board |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 01/20/2004 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01295 |
| Federal ID | IA01295 |
| More Info | State Dam Safety Program |