Granaman Dam is an earth dam located in Wapello County, Iowa, built in 2015. It carries a Low hazard potential classification.
Dam profile
NID height · 23 ft23 ft tall and 551 ft long. 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 Granaman Dam
The primary purpose of Granaman Dam is grade stabilization. Grade stabilization dams prevent erosion by reducing the slope and velocity of water flowing through a channel. They're commonly used to stop gullies from deepening and to protect downstream land and infrastructure. The dam is owned by Irene Granaman (private). It impounds the Tr-competine Cr near Westwood.
The dam stands 23 feet tall and stretches 551 feet across, creates a reservoir covering 8 acres, has a maximum storage capacity of 104 acre-feet, and collects water from a drainage area of 0 square miles. Completed in 2015, 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 | Wapello |
| Nearest City | Westwood |
| River/Stream | Tr-competine Cr |
| Coordinates | 41.10330, -92.20520 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 23 ft |
| Dam Height | 23 ft |
| Dam Length | 551 ft |
| Year Completed | 2015 (11 years old) |
Storage & Hydraulics
| NID Storage | 104 acre-ft |
| Max Storage | 104 acre-ft |
| Normal Storage | 46 acre-ft |
| Surface Area | 8 acres |
| Drainage Area | 0 sq mi |
| Max Discharge | 99 cfs |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Grade Stabilization |
| Owner | Irene Granaman |
| Owner Type | Private |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA04447 |
| Federal ID | IA04447 |
| More Info | State Dam Safety Program |