Hendrickson Marsh Dam
Hendrickson Marsh Dam is an earth dam located in Marshall County, Iowa, built in 1967. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
About Hendrickson Marsh Dam
The primary purpose of Hendrickson Marsh 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 Marshall-story D.d. #2 near Mingo.
The dam stands 18 feet tall and stretches 321 feet across, creates a reservoir covering 264 acres, has a maximum storage capacity of 2,800 acre-feet, and collects water from a drainage area of 13 square miles. Completed in 1967, 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 satisfactory, indicating no existing or potential dam safety deficiencies are recognized. The most recent inspection on record was 06/05/2020.
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Location
| State | Iowa |
| County | Marshall |
| Nearest City | Mingo |
| River/Stream | Marshall-story D.d. #2 |
| Coordinates | 41.93840, -93.23150 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 18 ft |
| Dam Height | 18 ft |
| Dam Length | 321 ft |
| Year Completed | 1967 (59 years old) |
Storage & Hydraulics
| NID Storage | 2,800 acre-ft |
| Max Storage | 2,800 acre-ft |
| Normal Storage | 1,310 acre-ft |
| Surface Area | 264 acres |
| Drainage Area | 13 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 06/05/2020 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA00669 |
| Federal ID | IA00669 |
| More Info | State Dam Safety Program |