Union Grove Silt Containment Dam is an earth dam located in Tama County, Iowa, built in 1990. It carries a Low hazard potential classification.
Dam profile
NID height · 17 ft17 ft tall and 720 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 Union Grove Silt Containment Dam
The primary purpose of Union Grove Silt Containment Dam is debris control. The dam is designed to catch sediment, rocks, and debris carried by flowing water — particularly important in areas prone to mudslides or heavy erosion. The dam is owned by Iowa Department of Natural Resources (state). It impounds the Tr- Union Grove Lake near Garwin.
The dam stands 17 feet tall and stretches 720 feet across, has a maximum storage capacity of 249 acre-feet, and collects water from a drainage area of 1 square miles. Completed in 1990, the structure is 36 years 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.
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Location
| State | Iowa |
| County | Tama |
| Nearest City | Garwin |
| River/Stream | Tr- Union Grove Lake |
| Coordinates | 42.12320, -92.72790 |
Physical Characteristics
| Dam Type | Earth |
| NID Height | 17 ft |
| Dam Height | 17 ft |
| Dam Length | 720 ft |
| Year Completed | 1990 (36 years old) |
Storage & Hydraulics
| NID Storage | 249 acre-ft |
| Max Storage | 249 acre-ft |
| Drainage Area | 1 sq mi |
| Spillway Type | Uncontrolled |
Ownership & Safety
| Purpose | Debris Control |
| Owner | Iowa Department of Natural Resources |
| Owner Type | State |
| Hazard Classification | Low |
| Condition Assessment | Not assessed |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | IA02578 |
| Federal ID | IA02578 |
| More Info | State Dam Safety Program |