Mallard Marsh Dam No 1 is an earth dam located in Cerro Gordo County, Iowa, built in 1967. It carries a Low hazard potential classification.
Dam profile
NID height · 8 ft8 ft tall and 650 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Mallard Marsh Dam No 1
The primary purpose of Mallard Marsh Dam No 1 is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Cerro Gordo County Conservation Board (local government). It impounds the Tr-winnebago River near Fertile.
The dam stands 8 feet tall and stretches 650 feet across, creates a reservoir covering 26 acres, has a maximum storage capacity of 156 acre-feet, and collects water from a drainage area of 2 square miles. Completed in 1967, 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.
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Location
| State | Iowa |
| County | Cerro Gordo |
| Nearest City | Fertile |
| River/Stream | Tr-winnebago River |
| Coordinates | 43.24350, -93.45900 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 650 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 156 acre-ft |
| Max Storage | 156 acre-ft |
| Normal Storage | 52 acre-ft |
| Surface Area | 26 acres |
| Drainage Area | 2 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Cerro Gordo County Conservation Board |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00177 |
| Federal ID | IA00177 |
| More Info | State Dam Safety Program |