Gantz Dam
Gantz Dam is a gravity dam located in Natrona County, Wyoming, built in 1964. It carries a Low hazard potential classification.
About Gantz Dam
The primary purpose of Gantz 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 Doi Blm (federal). It impounds the South Fork Okie Draw.
The dam stands 34 feet tall and stretches 301 feet across, creates a reservoir covering 3 acres, has a storage capacity of 42 acre-feet, and collects water from a drainage area of 3 square miles. Completed in 1964, the structure is well into its service life at over 50 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. The most recent inspection on record was 07/21/2017.
At 34 feet, this dam is taller than 80% of dams nationwide.
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Location
| State | Wyoming |
| County | Natrona |
| River/Stream | South Fork Okie Draw |
| Coordinates | 43.28609, -107.10832 |
Physical Characteristics
| Dam Type | Gravity |
| NID Height | 34 ft |
| Dam Length | 301 ft |
| Year Completed | 1964 (62 years old) |
Storage & Hydraulics
| NID Storage | 42 acre-ft |
| Normal Storage | 42 acre-ft |
| Surface Area | 3 acres |
| Drainage Area | 3 sq mi |
| Max Discharge | 421 cfs |
Ownership & Safety
| Purpose | Debris Control |
| Owner | DOI BLM |
| Owner Type | Federal |
| Hazard Classification | Low |
| Condition Assessment | Not Rated |
| Last Inspection | 07/21/2017 |
| Emergency Action Plan | Not Required |
Identifiers
| NID ID | WY01442 |
| Federal ID | WY01442 |
| More Info | State Dam Safety Program |