Pilot Knob Lake Dam
Pilot Knob Lake Dam is an earth dam located in Hancock County, Iowa, built in 1972. It carries a Low hazard potential classification and has a satisfactory condition assessment.
About Pilot Knob Lake Dam
The primary purpose of Pilot Knob Lake Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Iowa Department Of Natural Resources (state). It impounds the Tr-winnebago River near Fertile.
The dam stands 18 feet tall and stretches 210 feet across, creates a reservoir covering 24 acres, has a maximum storage capacity of 111 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1972, 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. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 06/04/2019.
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Location
| State | Iowa |
| County | Hancock |
| Nearest City | Fertile |
| River/Stream | Tr-winnebago River |
| Coordinates | 43.25300, -93.56480 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 210 ft |
| Year Completed | 1972 (54 years old) |
Storage & Hydraulics
| NID Storage | 111 acre-ft |
| Max Storage | 111 acre-ft |
| Normal Storage | 56 acre-ft |
| Surface Area | 24 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/04/2019 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00439 |
| Federal ID | IA00439 |
| More Info | State Dam Safety Program |