Plotz Dam is an earth dam located in Johnson County, Iowa, built in 1968. It carries a Low hazard potential classification.
Dam profile
NID height · 28 ft28 ft tall and 287 ft long, taller than 62% of U.S. dams with a recorded height. Height is drawn to scale against a two-story house, about 25 ft; the profile is a generic embankment section and the water level is illustrative.
About Plotz Dam
The primary purpose of Plotz Dam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Martin Plotz (private). It impounds the Tr-knapp Creek near Coralville Reservoir.
The dam stands 28 feet tall and stretches 287 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 44 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 1968, 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.
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Location
| State | Iowa |
| County | Johnson |
| Nearest City | Coralville Reservoir |
| River/Stream | Tr-knapp Creek |
| Coordinates | 41.82820, -91.79860 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 28 ft |
| Dam Height | 28 ft |
| Dam Length | 287 ft |
| Year Completed | 1968 (58 years old) |
Storage & Hydraulics
| NID Storage | 44 acre-ft |
| Max Storage | 44 acre-ft |
| Normal Storage | 22 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Martin Plotz |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01328 |
| Federal ID | IA01328 |
| More Info | State Dam Safety Program |