Pierz Lake is a gravity dam located in Morrison County, Minnesota, built in 1955. It carries a Low hazard potential classification.
Dam profile
NID height · 8 ft8 ft tall and 118 ft long. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic concrete gravity section and the water level is illustrative.
About Pierz Lake
The primary purpose of Pierz Lake is fish and wildlife pond. The dam creates habitat for fish and wildlife, supporting local ecosystems and potentially serving conservation goals. The dam is owned by Mndnr-fisheries (state). It impounds the Platte River-tr near Royalton.
The dam stands 8 feet tall and stretches 118 feet across, creates a reservoir covering 189 acres, has a maximum storage capacity of 3,900 acre-feet, and collects water from a drainage area of 4 square miles. Completed in 1955, 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. The most recent inspection on record was 08/28/2024.
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Location
| State | Minnesota |
| County | Morrison |
| Nearest City | Royalton |
| River/Stream | Platte River-tr |
| Coordinates | 45.96165, -94.16462 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 6 ft |
| Dam Length | 118 ft |
| Year Completed | 1955 (71 years old) |
Storage & Hydraulics
| NID Storage | 3,900 acre-ft |
| Max Storage | 3,900 acre-ft |
| Normal Storage | 3,200 acre-ft |
| Surface Area | 189 acres |
| Drainage Area | 4 sq mi |
Ownership & Safety
| Purpose | Fish and Wildlife Pond |
| Owner | Mndnr-fisheries |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 08/28/2024 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | MN00715 |
| Federal ID | MN00715 |
| More Info | State Dam Safety Program |