Mason City-lehigh Cement Milldam
Mason City-lehigh Cement Milldam is a gravity dam located in Cerro Gordo County, Iowa, built in 1924. It carries a Low hazard potential classification.
About Mason City-lehigh Cement Milldam
The primary purpose of Mason City-lehigh Cement 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 Lehigh Portland Cement Company (private). It impounds the Calmus Creek near Mason City.
The dam stands 8 feet tall and stretches 71 feet across, creates a reservoir covering 20 acres, has a maximum storage capacity of 150 acre-feet, and collects water from a drainage area of 26 square miles. Completed in 1924, 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 36 years ago.
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Location
| State | Iowa |
| County | Cerro Gordo |
| Nearest City | Mason City |
| River/Stream | Calmus Creek |
| Coordinates | 43.17780, -93.21550 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 8 ft |
| Dam Height | 8 ft |
| Dam Length | 71 ft |
| Year Completed | 1924 (102 years old) |
Storage & Hydraulics
| NID Storage | 150 acre-ft |
| Max Storage | 150 acre-ft |
| Normal Storage | 75 acre-ft |
| Surface Area | 20 acres |
| Drainage Area | 26 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Water Supply |
| Owner | LeHigh Portland Cement Company |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 09/28/1989 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA01310 |
| Federal ID | IA01310 |
| More Info | State Dam Safety Program |