Cedar Rapids Milldam (5 in 1) is a gravity dam located in Linn County, Iowa, built in 1978. It carries a Significant hazard potential classification and has a satisfactory condition assessment.
Dam profile
NID height · 16 ft16 ft tall and 680 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 Cedar Rapids Milldam (5 in 1)
The primary purpose of Cedar Rapids Milldam (5 in 1) is hydroelectric. The dam generates hydroelectric power by channeling water through turbines, converting the energy of flowing water into electricity. The dam is owned by City of Cedar Rapids (local government). It impounds the Cedar River near Cedar Rapids.
The dam stands 16 feet tall and stretches 680 feet across, creates a reservoir covering 985 acres, has a maximum storage capacity of 9,843 acre-feet, and collects water from a drainage area of 6,510 square miles. Completed in 1978, the structure is 48 years old.
This dam has a significant hazard potential classification, meaning that a failure could cause significant economic damage — flooding roads, bridges, or property downstream — but is not expected to result in loss of life. Its condition is rated satisfactory, indicating no existing or potential dam safety deficiencies are recognized. An emergency action plan is in place for this dam. The most recent inspection on record was 09/21/2021.
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Location
| State | Iowa |
| County | Linn |
| Nearest City | Cedar Rapids |
| River/Stream | Cedar River |
| Coordinates | 41.97890, -91.67230 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 16 ft |
| Dam Height | 14 ft |
| Dam Length | 680 ft |
| Year Completed | 1978 (48 years old) |
Storage & Hydraulics
| NID Storage | 9,843 acre-ft |
| Max Storage | 9,843 acre-ft |
| Normal Storage | 9,843 acre-ft |
| Surface Area | 985 acres |
| Drainage Area | 6,510 sq mi |
| Spillway Type | Controlled |
Ownership & Safety
| Purpose | Hydroelectric |
| Owner | City of Cedar Rapids |
| Owner Type | Local Government |
| Hazard Classification | Significant |
| Condition Assessment | Satisfactory |
| Last Inspection | 09/21/2021 |
| Emergency Action Plan | Yes |
Identifiers
| NID ID | IA01821 |
| Federal ID | IA01821 |
| More Info | State Dam Safety Program |