Fertile Mill Dam is a gravity dam located in Worth County, Iowa, built in 1929. It carries a Low hazard potential classification.
Dam profile
NID height · 11 ft11 ft tall and 414 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 Fertile Mill Dam
The primary purpose of Fertile Mill Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Worth County Conservation Board (local government). It impounds the Winnebago River near Fertile.
The dam stands 11 feet tall and stretches 414 feet across, creates a reservoir covering 260 acres, has a maximum storage capacity of 116 acre-feet, and collects water from a drainage area of 376 square miles. Completed in 1929, 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.
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Location
| State | Iowa |
| County | Worth |
| Nearest City | Fertile |
| River/Stream | Winnebago River |
| Coordinates | 43.26360, -93.42170 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 11 ft |
| Dam Height | 11 ft |
| Dam Length | 414 ft |
| Year Completed | 1929 (97 years old) |
Storage & Hydraulics
| NID Storage | 116 acre-ft |
| Max Storage | 116 acre-ft |
| Normal Storage | 116 acre-ft |
| Surface Area | 260 acres |
| Drainage Area | 376 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Worth County Conservation Board |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01967 |
| Federal ID | IA01967 |
| More Info | State Dam Safety Program |