Monticello Milldam is a gravity dam located in Jones County, Iowa, built in 1914. It carries a Low hazard potential classification.
Dam profile
NID height · 12 ft12 ft tall and 1,199 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 Monticello Milldam
The primary purpose of Monticello Milldam is recreation. The dam creates a reservoir used for recreational activities such as fishing, boating, and swimming. The dam is owned by Jones County Conservation Board (local government). It impounds the Maquoketa River near Canton.
The dam stands 12 feet tall and stretches 1,199 feet across, creates a reservoir covering 700 acres, has a maximum storage capacity of 4,186 acre-feet, and collects water from a drainage area of 657 square miles. Completed in 1914, the structure is over a century 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. The most recent inspection on record was 09/28/1989. That was over 37 years ago.
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Location
| State | Iowa |
| County | Jones |
| Nearest City | Canton |
| River/Stream | Maquoketa River |
| Coordinates | 42.24460, -91.17200 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 12 ft |
| Dam Height | 12 ft |
| Dam Length | 1,199 ft |
| Year Completed | 1914 (112 years old) |
Storage & Hydraulics
| NID Storage | 4,186 acre-ft |
| Max Storage | 4,186 acre-ft |
| Normal Storage | 4,186 acre-ft |
| Surface Area | 700 acres |
| Drainage Area | 657 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Recreation |
| Owner | Jones County Conservation Board |
| Owner Type | Local Government |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Last Inspection | 09/28/1989 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01313 |
| Federal ID | IA01313 |
| More Info | State Dam Safety Program |