Lake Keomah Silt Dam is an earth dam located in Mahaska County, Iowa, built in 1938. It carries a Low hazard potential classification.
Dam profile
NID height · 25 ft25 ft tall and 455 ft long, taller than 50% of U.S. dams with a recorded height. 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 Lake Keomah Silt Dam
Lake Keomah Silt Dam is a dam in Mahaska, Iowa. The dam is owned by Iowa Department of Natural Resources (state). It impounds the Tr-skunk River near Lake Keomah.
The dam stands 25 feet tall and stretches 455 feet across, creates a reservoir covering 9 acres, has a maximum storage capacity of 100 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1938, 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.
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Location
| State | Iowa |
| County | Mahaska |
| Nearest City | Lake Keomah |
| River/Stream | Tr-skunk River |
| Coordinates | 41.28380, -92.53840 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 25 ft |
| Dam Height | 25 ft |
| Dam Length | 455 ft |
| Year Completed | 1938 (88 years old) |
Storage & Hydraulics
| NID Storage | 100 acre-ft |
| Max Storage | 100 acre-ft |
| Normal Storage | 21 acre-ft |
| Surface Area | 9 acres |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Other |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA02057 |
| Federal ID | IA02057 |
| More Info | State Dam Safety Program |