Hopp Dam (upper Site) is an earth dam located in Mills County, Iowa, built in 2005. It carries a Low hazard potential classification.
Dam profile
NID height · 36 ft36 ft tall and 655 ft long, taller than 82% 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 Hopp Dam (upper Site)
The primary purpose of Hopp Dam (upper Site) is grade stabilization. Grade stabilization dams prevent erosion by reducing the slope and velocity of water flowing through a channel. They're commonly used to stop gullies from deepening and to protect downstream land and infrastructure. The dam is owned by Donald Hopp (private). It impounds the Trib to Silver Creek near Malvern.
The dam stands 36 feet tall and stretches 655 feet across, creates a reservoir covering 5 acres, has a maximum storage capacity of 87 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2005, the structure is relatively new.
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.
At 36 feet, this dam is taller than 82% of dams nationwide.
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Location
| State | Iowa |
| County | Mills |
| Nearest City | Malvern |
| River/Stream | Trib to Silver Creek |
| Coordinates | 41.05810, -95.65360 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 36 ft |
| Dam Height | 36 ft |
| Dam Length | 655 ft |
| Year Completed | 2005 (21 years old) |
Storage & Hydraulics
| NID Storage | 87 acre-ft |
| Max Storage | 87 acre-ft |
| Normal Storage | 46 acre-ft |
| Surface Area | 5 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 148 cfs |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Donald Hopp |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04068 |
| Federal ID | IA04068 |
| More Info | State Dam Safety Program |