Boone Milldam is a gravity dam located in Boone County, Iowa, built in 1932. It carries a Low hazard potential classification.
Dam profile
NID height · 7 ft7 ft tall and 355 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 Boone Milldam
The primary purpose of Boone Milldam is water supply. The dam stores water for municipal, industrial, or agricultural use, helping ensure a reliable supply for the surrounding area. The dam is owned by City of Boone (local government). It impounds the Des Moines River near Boone.
The dam stands 7 feet tall and stretches 355 feet across, creates a reservoir covering 110 acres, has a maximum storage capacity of 387 acre-feet, and collects water from a drainage area of 5,510 square miles. Completed in 1932, the structure is well-established, with more than 75 years of service.
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 09/22/1989. That was over 37 years ago.
Search for dams near your address to see all dams in your area with hazard classifications and safety data.
Location
| State | Iowa |
| County | Boone |
| Nearest City | Boone |
| River/Stream | Des Moines River |
| Coordinates | 42.07710, -93.93600 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 7 ft |
| Dam Height | 7 ft |
| Dam Length | 355 ft |
| Year Completed | 1932 (94 years old) |
Storage & Hydraulics
| NID Storage | 387 acre-ft |
| Max Storage | 387 acre-ft |
| Normal Storage | 387 acre-ft |
| Surface Area | 110 acres |
| Drainage Area | 5,510 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | City of Boone |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/22/1989 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01269 |
| Federal ID | IA01269 |
| More Info | State Dam Safety Program |