Lake Hendricks Dam
Lake Hendricks Dam is an earth dam located in Howard County, Iowa, built in 1960. It carries a Significant hazard potential classification and has a poor condition assessment.
About Lake Hendricks Dam
The primary purpose of Lake Hendricks Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Howard County Conservation Board (local government). It impounds the Tr-wapsipinicon River near Riceville.
The dam stands 30 feet tall and stretches 2,375 feet across, creates a reservoir covering 50 acres, has a maximum storage capacity of 960 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1960, the structure is well into its service life at over 50 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated poor, meaning the dam has recognized safety deficiencies that require remediation to address risks. The most recent inspection on record was 07/16/2024.
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Location
| State | Iowa |
| County | Howard |
| Nearest City | Riceville |
| River/Stream | Tr-wapsipinicon River |
| Coordinates | 43.36990, -92.54950 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 2,375 ft |
| Year Completed | 1960 (66 years old) |
Storage & Hydraulics
| NID Storage | 960 acre-ft |
| Max Storage | 960 acre-ft |
| Normal Storage | 500 acre-ft |
| Surface Area | 50 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Howard County Conservation Board |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Poor |
| Last Inspection | 07/16/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00495 |
| Federal ID | IA00495 |
| More Info | State Dam Safety Program |