Lower Dunbar Dam is an earth dam located in Greene County, Iowa, built in 1996. It carries a Low hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 3,200 ft long. 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 Lower Dunbar Dam
The primary purpose of Lower Dunbar 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 Tr- Willow Creek near Bayard.
The dam stands 7 feet tall and stretches 3,200 feet across, creates a reservoir covering 52 acres, has a maximum storage capacity of 189 acre-feet, and collects water from a drainage area of 13 square miles. Completed in 1996, the structure is 30 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 | Greene |
| Nearest City | Bayard |
| River/Stream | Tr- Willow Creek |
| Coordinates | 41.97020, -94.62890 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 3,200 ft |
| Year Completed | 1996 (30 years old) |
Storage & Hydraulics
| NID Storage | 189 acre-ft |
| Max Storage | 189 acre-ft |
| Normal Storage | 104 acre-ft |
| Surface Area | 52 acres |
| Drainage Area | 13 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA03077 |
| Federal ID | IA03077 |
| More Info | State Dam Safety Program |