Hawley Dam is an earth dam located in Crawford County, Iowa, built in 2009. It carries a Low hazard potential classification.
Dam profile
NID height · 30 ft30 ft tall and 405 ft long, taller than 68% 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 Hawley Dam
The primary purpose of Hawley Dam is flood risk reduction. The dam is designed to control downstream flooding by temporarily storing excess water during storms and releasing it at a controlled rate. The dam is owned by Frank Hawley (private). It impounds the Trip to Rocky Run near Denison.
The dam stands 30 feet tall and stretches 405 feet across, creates a reservoir covering 3 acres, has a maximum storage capacity of 39 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2009, 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.
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Location
| State | Iowa |
| County | Crawford |
| Nearest City | Denison |
| River/Stream | Trip to Rocky Run |
| Coordinates | 42.08700, -95.25360 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 30 ft |
| Dam Height | 30 ft |
| Dam Length | 405 ft |
| Year Completed | 2009 (17 years old) |
Storage & Hydraulics
| NID Storage | 39 acre-ft |
| Max Storage | 39 acre-ft |
| Normal Storage | 15 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 0 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Flood Risk Reduction |
| Owner | Frank Hawley |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA03937 |
| Federal ID | IA03937 |
| More Info | State Dam Safety Program |