Lake Delhi Dam
Lake Delhi Dam is a gravity dam located in Delaware County, Iowa, built in 1922. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Lake Delhi Dam
The primary purpose of Lake Delhi Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Lake Delhi Recreation Association (private). It impounds the Maquoketa River near Hopkinton.
The dam stands 55 feet tall and stretches 750 feet across, creates a reservoir covering 440 acres, has a maximum storage capacity of 9,920 acre-feet, and collects water from a drainage area of 347 square miles. Completed in 1922, the structure is over a century 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 07/09/2020.
At 55 feet, this dam is taller than 94% of dams nationwide.
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Location
| State | Iowa |
| County | Delaware |
| Nearest City | Hopkinton |
| River/Stream | Maquoketa River |
| Coordinates | 42.40810, -91.34540 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 55 ft |
| Dam Height | 55 ft |
| Dam Length | 750 ft |
| Year Completed | 1922 (104 years old) |
Storage & Hydraulics
| NID Storage | 9,920 acre-ft |
| Max Storage | 9,920 acre-ft |
| Normal Storage | 3,790 acre-ft |
| Surface Area | 440 acres |
| Drainage Area | 347 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Lake Delhi Recreation Association |
| Owner Type | Private |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 07/09/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01297 |
| Federal ID | IA01297 |
| More Info | State Dam Safety Program |